{"title":"Stearns VR \/ 2VR Series SINPAC Switches","description":"","products":[{"product_id":"477205015uc1-stearns-sinpac-electronic-switch","title":"477205015UC1 Stearns SINPAC Electronic Switch","description":"\u003chtmlonly\u003e\r\u003cbr\u003e\u003clink rel=\"stylesheet\" href=\"\/Static\/css\/VendorBranding\/Genericproduct.css\"\u003e\r\u003cbr\u003e\t\u003cheader class=\"productspecifications-header\"\u003e\r\u003cbr\u003e\t\t\u003ch3\u003e2VR Series for 230 Vac Capacitor Start\/Capacitor Run Motors\u003c\/h3\u003e\r\u003cbr\u003e\t\u003c\/header\u003e\r\u003cbr\u003e\u003ch3\u003e\u003c\/h3\u003e\n\u003cp\u003eBasic Operation\r\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003e  Capacitor start\/capacitor run motors and capacitor start motors provide continuous voltage sensing information which can be used to extract speed data from the voltage across the motor start (auxiliary) winding. By comparing this start (auxiliary) winding RPM-sensitive voltage to the main AC input voltage (which serves as a reference voltage), the switch determines when the start circuit should be de-energized. The electronic switch interrupts the start circuit current after the motor has accelerated to the cut out speed, and reconnects the start circuit whenever the motor speed has decreased to a preselected cut in RPM level.\r\u003cbr\u003eCapacitor start\/capacitor run motors exhibit current transients and higher voltages across the start switch. This electrical stress is due to the voltage differential which may exist between the start and run capacitors at the instant of switch closure. This stress phenomenon occurs with both mechanical and electronic type start switches. SINPAC Switches have voltage detection circuitry to minimize the effects of these conditions.\r\u003cbr\u003e\r\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003e1. Universal Design:\u003c\/b\u003e 50\/60 Hz operation. Will work on 2, 4 or 6 pole motors of any manufacturer. Reduced inventory.\r\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003e2. Line Voltage Compensation:\u003c\/b\u003e Operating voltage 190 to 260 Vac.\r\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003e3. Electrically Protected: \u003c\/b\u003eDesigned to filter out electrical noise, so there is no concern of random switch malfunction.\r\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003e4. Zero Crossing Logic: \u003c\/b\u003eCurrent spiking due to run capacitor no longer a problem.\r\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003e5. Speed Sensitive\u003c\/b\u003e\r\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003e6. Soldered Heat Sink:\u003c\/b\u003e High cycling.\r\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003e7. Environmentally Protected:\u003c\/b\u003e Immune to moisture, dust, dirt, shock and vibration.\r\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003e8. Transient Protection: \u003c\/b\u003eTransient protection tested per IEEE C62.41 - 1991 Category A3.\r\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003e9. Start Capacitor Discharge Resistor:\u003c\/b\u003e Increase start capacitor life.\r\u003cbr\u003e\r\u003cbr\u003e\u003c\/p\u003e\n\u003cdiv class=\"productspecifications\"\u003e\r\u003cbr\u003e\t\t\u003ch3\u003eGeneral Information\u003c\/h3\u003e\r\u003cbr\u003e\t\u003ctable\u003e\r\u003cbr\u003e\t\t\u003ctbody\u003e\r\u003cbr\u003e\t\t\t\u003ctr\u003e\r\u003cbr\u003e\t\t\t\t\u003cth\u003eTypical Max Motor Horsepower (HP)\u003c\/th\u003e\r\u003cbr\u003e\t\t\t\t\u003ctd\u003e5 HP\u003c\/td\u003e\r\u003cbr\u003e\t\t\t\u003c\/tr\u003e\r\u003cbr\u003e\t\t\t\u003ctr\u003e\r\u003cbr\u003e\t\t\t\t\u003cth\u003eTypical Full Load Motor Nameplate Current Rating (Amps)\u003c\/th\u003e\r\u003cbr\u003e\t\t\t\t\u003ctd\u003e25 Amps @ 230 Volts\u003c\/td\u003e\r\u003cbr\u003e\t\t\t\u003c\/tr\u003e\r\u003cbr\u003e\t\t\t\u003ctr\u003e\r\u003cbr\u003e\t\t\t\t\u003cth\u003eSwitch Rating \u0026amp; Permissible Maximum Start Circuit Current (Amps)\u003c\/th\u003e\r\u003cbr\u003e\t\t\t\t\u003ctd\u003e50 Amps\u003c\/td\u003e\r\u003cbr\u003e\t\t\t\u003c\/tr\u003e\r\u003cbr\u003e\t\t\t\u003ctr\u003e\r\u003cbr\u003e\t\t\t\t\u003cth\u003eStart Circuit Voltage\u003c\/th\u003e\r\u003cbr\u003e\t\t\t\t\u003ctd\u003e230\u003c\/td\u003e\r\u003cbr\u003e\t\t\t\u003c\/tr\u003e\r\u003cbr\u003e\t\t\t\u003ctr\u003e\r\u003cbr\u003e\t\t\t\t\u003cth\u003eCut Out Voltage (Typical)\u003c\/th\u003e\r\u003cbr\u003e\t\t\t\t\u003ctd\u003e260 Volts\u003c\/td\u003e\r\u003cbr\u003e\t\t\t\u003c\/tr\u003e\r\u003cbr\u003e\t\t\t\u003ctr\u003e\r\u003cbr\u003e\t\t\t\t\u003cth\u003eCut In Voltage Typical\u003c\/th\u003e\r\u003cbr\u003e\t\t\t\t\u003ctd\u003e70 Volts\u003c\/td\u003e\r\u003cbr\u003e\t\t\t\u003c\/tr\u003e\r\u003cbr\u003e\t\t\t\u003ctr\u003e\r\u003cbr\u003e\t\t\t\t\u003cth\u003ePackage Style\u003c\/th\u003e\r\u003cbr\u003e\t\t\t\t\u003ctd\u003e15\u003c\/td\u003e\r\u003cbr\u003e\t\t\t\u003c\/tr\u003e\r\u003cbr\u003e\t\t\t\u003ctr\u003e\r\u003cbr\u003e\t\t\t\t\u003cth\u003eCatalog Number\u003c\/th\u003e\r\u003cbr\u003e\t\t\t\t\u003ctd\u003e2VR-50-260\u003c\/td\u003e\r\u003cbr\u003e\t\t\t\u003c\/tr\u003e\r\u003cbr\u003e\t\t\t\u003ctr\u003e\r\u003cbr\u003e\t\t\t\t\u003cth\u003ePart Number\u003c\/th\u003e\r\u003cbr\u003e\t\t\t\t\u003ctd\u003eStearns 4-7-72050-15-UC1\u003cbr\u003eStearns Kit 4-7-72050-15-UCK\u003cbr\u003eSAP Part# 10550784\u003c\/td\u003e\r\u003cbr\u003e\t\t\t\u003c\/tr\u003e\r\u003cbr\u003e\t\t\t\u003ctr\u003e\r\u003cbr\u003e\t\t\t\t\u003cth\u003eOperating Temperature\u003c\/th\u003e\r\u003cbr\u003e\t\t\t\t\u003ctd\u003e-40°C to 65 °C (-40 °F to 149°F)\u003cbr\u003eFor operation between 65°C and 85°C (149°F and 185°F), consult factory.\u003c\/td\u003e\r\u003cbr\u003e\t\t\t\u003c\/tr\u003e\r\u003cbr\u003e\t\t\t\u003ctr\u003e\r\u003cbr\u003e\t\t\t\t\u003cth\u003eOperating Voltage\u003c\/th\u003e\r\u003cbr\u003e\t\t\t\t\u003ctd\u003e230 Vac SINPAC Switch: 190-255 Vac.\u003c\/td\u003e\r\u003cbr\u003e\t\t\t\u003c\/tr\u003e\r\u003cbr\u003e\t\t\t\u003ctr\u003e\r\u003cbr\u003e\t\t\t\t\u003cth colspan=\"2\"\u003e UL Recognition (E71115) to US and Canadian Standards\u003c\/th\u003e\r\u003cbr\u003e\t\t\t\u003c\/tr\u003e\r\u003cbr\u003e\t\t\t\u003ctr\u003e\r\u003cbr\u003e\t\t\t\t\u003cth\u003eUPC\u003c\/th\u003e\r\u003cbr\u003e\t\t\t\t\u003ctd\u003e662327713713\u003c\/td\u003e\r\u003cbr\u003e\t\t\t\u003c\/tr\u003e\r\u003cbr\u003e\t\t\u003c\/tbody\u003e\r\u003cbr\u003e\t\u003c\/table\u003e\r\u003cbr\u003e\r\u003cbr\u003e\u003cp\u003e\u003c\/p\u003e\n\u003ch3\u003eAdditional Features\u003c\/h3\u003e\r\u003cbr\u003e\u003cp\u003e\u003cb\u003eCompletely Solid-State with No Moving Parts: \u003c\/b\u003e SINPAC Switches have no physical constraints to affect their operation. No wearing parts mean high cycling, no arcing contact.\r\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eSilent Operation: \u003c\/b\u003eNo switch noise\r\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eAmbient 40° to 65°C.\u003c\/b\u003e\r\u003cbr\u003e\u003c\/p\u003e\n\u003c\/div\u003e\r\u003cbr\u003e\u003cp\u003e\u003c\/p\u003e\n\u003ch3\u003eSelection\u003c\/h3\u003e\r\u003cbr\u003e\u003cp\u003eMotor hp ratings are typical. For an accurate selection procedure, measure start capacitor current during a normal start or at locked rotor and select a SINPAC Switch with higher maximum current rating than that measured.\r\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003e1. Be sure switch series matches motor type.\r\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003e2. Be sure switch voltage rating matches auxiliary (start) circuit voltage rating.\r\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003e3. Selection can be based on actual measurement of start capacitor current or two times the motor nameplate FLA rating.\r\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003e4. Switch current rating must match or exceed the motor start capacitor current requirements. Always select a SINPAC Switch with the next higher current rating for:\r\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003e  a) High cycling applications.\r\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003e  b) Long acceleration time.\r\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003e  c) High ambients: Greater than 55° C.\r\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003e5. To assure proper motor operation, the voltage across the start winding must reach the SINPAC Switch cut out reference voltage between 70% to 85% of motors synchronous speed. SINPAC Switches are line voltage compensated. Changes in the line voltage will not effect system operation unless an overload condition causes reduced running speed, along with reduced voltage across the start winding.\r\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003e6. Higher current switches can be used in place of lower rated switches of the same series.\r\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003e\u003c\/p\u003e\n\u003ch3\u003e Line Voltage Compensation Charts\u003c\/h3\u003e\r\u003cbr\u003e\u003cp\u003e  Induced voltage across the start winding is directly proportional to motor speed and line voltage. All SINPAC Switches use this voltage to switch the start capacitor out of the circuit. Your motor with a SINPAC Switch must generate a voltage greater than the switch cut-out voltage to assure cut-out of the start capacitor. Refer to charts ABOVE.\r\u003cbr\u003e\u003c\/p\u003e\u003c\/htmlonly\u003e","brand":"Stearns\/Rexnord Corporation","offers":[{"title":"Default Title","offer_id":43915208884317,"sku":"2VR50-260","price":309.65,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0704\/4005\/8973\/files\/8RU606BLP6QUF8U0.jpg?v=1766442870"},{"product_id":"477205015u03-stearns-sinpac-electronic-switch","title":"477205015U03 Stearns SINPAC Electronic Switch","description":"\u003chtmlonly\u003e\r\u003cbr\u003e\u003clink rel=\"stylesheet\" href=\"\/Static\/css\/VendorBranding\/Genericproduct.css\"\u003e\r\u003cbr\u003e\t\u003cheader class=\"productspecifications-header\"\u003e\r\u003cbr\u003e\t\t\u003ch3\u003e2CV Series for 230 Vac Capacitor Start Motors and 2VR Series for 230 Vac Capacitor Start\/Capacitor Run Motors\u003c\/h3\u003e\r\u003cbr\u003e\t\u003c\/header\u003e\r\u003cbr\u003e\u003ch3\u003e\u003c\/h3\u003e\n\u003cp\u003eBasic Operation\r\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003e  Capacitor start\/capacitor run motors and capacitor start motors provide continuous voltage sensing information which can be used to extract speed data from the voltage across the motor start (auxiliary) winding. By comparing this start (auxiliary) winding RPM-sensitive voltage to the main AC input voltage (which serves as a reference voltage), the switch determines when the start circuit should be de-energized. The electronic switch interrupts the start circuit current after the motor has accelerated to the cut out speed, and reconnects the start circuit whenever the motor speed has decreased to a preselected cut in RPM level.\r\u003cbr\u003eCapacitor start\/capacitor run motors exhibit current transients and higher voltages across the start switch. This electrical stress is due to the voltage differential which may exist between the start and run capacitors at the instant of switch closure. This stress phenomenon occurs with both mechanical and electronic type start switches. SINPAC Switches have voltage detection circuitry to minimize the effects of these conditions.\r\u003cbr\u003e\r\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003e1. Universal Design:\u003c\/b\u003e 50\/60 Hz operation. Will work on 2, 4 or 6 pole motors of any manufacturer. Reduced inventory.\r\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003e2. Line Voltage Compensation:\u003c\/b\u003e Operating voltage 190 to 260 Vac.\r\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003e3. Electrically Protected: \u003c\/b\u003eDesigned to filter out electrical noise, so there is no concern of random switch malfunction.\r\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003e4. Zero Crossing Logic: \u003c\/b\u003eCurrent spiking due to run capacitor no longer a problem.\r\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003e5. Speed Sensitive\u003c\/b\u003e\r\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003e6. Soldered Heat Sink:\u003c\/b\u003e High cycling.\r\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003e7. Environmentally Protected:\u003c\/b\u003e Immune to moisture, dust, dirt, shock and vibration.\r\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003e8. Transient Protection: \u003c\/b\u003eTransient protection tested per IEEE C62.41 - 1991 Category A3.\r\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003e9. Start Capacitor Discharge Resistor:\u003c\/b\u003e Increase start capacitor life.\r\u003cbr\u003e\r\u003cbr\u003e\u003c\/p\u003e\n\u003cdiv class=\"productspecifications\"\u003e\r\u003cbr\u003e\t\t\u003ch3\u003eGeneral Information\u003c\/h3\u003e\r\u003cbr\u003e\t\u003ctable\u003e\r\u003cbr\u003e\t\t\u003ctbody\u003e\r\u003cbr\u003e\t\t\t\u003ctr\u003e\r\u003cbr\u003e\t\t\t\t\u003cth\u003eTypical Max Motor Horsepower (HP)\u003c\/th\u003e\r\u003cbr\u003e\t\t\t\t\u003ctd\u003e5 HP\u003c\/td\u003e\r\u003cbr\u003e\t\t\t\u003c\/tr\u003e\r\u003cbr\u003e\t\t\t\u003ctr\u003e\r\u003cbr\u003e\t\t\t\t\u003cth\u003eTypical Full Load Motor Nameplate Current Rating (Amps)\u003c\/th\u003e\r\u003cbr\u003e\t\t\t\t\u003ctd\u003e25 Amps @ 230 Volts\u003c\/td\u003e\r\u003cbr\u003e\t\t\t\u003c\/tr\u003e\r\u003cbr\u003e\t\t\t\u003ctr\u003e\r\u003cbr\u003e\t\t\t\t\u003cth\u003eSwitch Rating \u0026amp; Permissible Maximum Start Circuit Current (Amps)\u003c\/th\u003e\r\u003cbr\u003e\t\t\t\t\u003ctd\u003e50 Amps\u003c\/td\u003e\r\u003cbr\u003e\t\t\t\u003c\/tr\u003e\r\u003cbr\u003e\t\t\t\u003ctr\u003e\r\u003cbr\u003e\t\t\t\t\u003cth\u003eStart Circuit Voltage\u003c\/th\u003e\r\u003cbr\u003e\t\t\t\t\u003ctd\u003e230\u003c\/td\u003e\r\u003cbr\u003e\t\t\t\u003c\/tr\u003e\r\u003cbr\u003e\t\t\t\u003ctr\u003e\r\u003cbr\u003e\t\t\t\t\u003cth\u003eCut Out Voltage (Typical)\u003c\/th\u003e\r\u003cbr\u003e\t\t\t\t\u003ctd\u003e310 Volts\u003c\/td\u003e\r\u003cbr\u003e\t\t\t\u003c\/tr\u003e\r\u003cbr\u003e\t\t\t\u003ctr\u003e\r\u003cbr\u003e\t\t\t\t\u003cth\u003eCut In Voltage Typical\u003c\/th\u003e\r\u003cbr\u003e\t\t\t\t\u003ctd\u003e70 Volts\u003c\/td\u003e\r\u003cbr\u003e\t\t\t\u003c\/tr\u003e\r\u003cbr\u003e\t\t\t\u003ctr\u003e\r\u003cbr\u003e\t\t\t\t\u003cth\u003ePackage Style\u003c\/th\u003e\r\u003cbr\u003e\t\t\t\t\u003ctd\u003e15\u003c\/td\u003e\r\u003cbr\u003e\t\t\t\u003c\/tr\u003e\r\u003cbr\u003e\t\t\t\u003ctr\u003e\r\u003cbr\u003e\t\t\t\t\u003cth\u003eCatalog Number\u003c\/th\u003e\r\u003cbr\u003e\t\t\t\t\u003ctd\u003e2VR-50-310\u003c\/td\u003e\r\u003cbr\u003e\t\t\t\u003c\/tr\u003e\r\u003cbr\u003e\t\t\t\u003ctr\u003e\r\u003cbr\u003e\t\t\t\t\u003cth\u003ePart Number\u003c\/th\u003e\r\u003cbr\u003e\t\t\t\t\u003ctd\u003eReplaces Old Stearns 4-7-72050-15-U01\u003cbr\u003eStearns Kit 4-7-72050-15-U0K\u003cbr\u003eStearns 4-7-72050-15-U03\u003cbr\u003eSAP Part# 10550781\u003c\/td\u003e\r\u003cbr\u003e\t\t\t\u003c\/tr\u003e\r\u003cbr\u003e\t\t\t\u003ctr\u003e\r\u003cbr\u003e\t\t\t\t\u003cth\u003eOperating Temperature\u003c\/th\u003e\r\u003cbr\u003e\t\t\t\t\u003ctd\u003e-40°C to 65 °C (-40 °F to 149°F)\u003cbr\u003eFor operation between 65°C and 85°C (149°F and 185°F), consult factory.\u003c\/td\u003e\r\u003cbr\u003e\t\t\t\u003c\/tr\u003e\r\u003cbr\u003e\t\t\t\u003ctr\u003e\r\u003cbr\u003e\t\t\t\t\u003cth\u003eOperating Voltage\u003c\/th\u003e\r\u003cbr\u003e\t\t\t\t\u003ctd\u003e230 Vac SINPAC Switch: 190-255 Vac.\u003c\/td\u003e\r\u003cbr\u003e\t\t\t\u003c\/tr\u003e\r\u003cbr\u003e\t\t\t\u003ctr\u003e\r\u003cbr\u003e\t\t\t\t\u003cth colspan=\"2\"\u003e UL Recognition (E71115) to US and Canadian Standards\u003c\/th\u003e\r\u003cbr\u003e\t\t\t\u003c\/tr\u003e\r\u003cbr\u003e\t\t\t\u003ctr\u003e\r\u003cbr\u003e\t\t\t\t\u003cth\u003eUPC\u003c\/th\u003e\r\u003cbr\u003e\t\t\t\t\u003ctd\u003e662327713720\u003c\/td\u003e\r\u003cbr\u003e\t\t\t\u003c\/tr\u003e\r\u003cbr\u003e\t\t\u003c\/tbody\u003e\r\u003cbr\u003e\t\u003c\/table\u003e\r\u003cbr\u003e\r\u003cbr\u003e\u003cp\u003e\u003c\/p\u003e\n\u003ch3\u003eAdditional Features\u003c\/h3\u003e\r\u003cbr\u003e\u003cp\u003e\u003cb\u003eCompletely Solid-State with No Moving Parts: \u003c\/b\u003e SINPAC Switches have no physical constraints to affect their operation. No wearing parts mean high cycling, no arcing contact.\r\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eSilent Operation: \u003c\/b\u003eNo switch noise\r\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eAmbient 40° to 65°C.\u003c\/b\u003e\r\u003cbr\u003e\u003c\/p\u003e\n\u003c\/div\u003e\r\u003cbr\u003e\u003cp\u003e\u003c\/p\u003e\n\u003ch3\u003eSelection\u003c\/h3\u003e\r\u003cbr\u003e\u003cp\u003eMotor hp ratings are typical. For an accurate selection procedure, measure start capacitor current during a normal start or at locked rotor and select a SINPAC Switch with higher maximum current rating than that measured.\r\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003e1. Be sure switch series matches motor type.\r\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003e2. Be sure switch voltage rating matches auxiliary (start) circuit voltage rating.\r\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003e3. Selection can be based on actual measurement of start capacitor current or two times the motor nameplate FLA rating.\r\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003e4. Switch current rating must match or exceed the motor start capacitor current requirements. Always select a SINPAC Switch with the next higher current rating for:\r\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003e  a) High cycling applications.\r\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003e  b) Long acceleration time.\r\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003e  c) High ambients: Greater than 55° C.\r\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003e5. To assure proper motor operation, the voltage across the start winding must reach the SINPAC Switch cut out reference voltage between 70% to 85% of motors synchronous speed. SINPAC Switches are line voltage compensated. Changes in the line voltage will not effect system operation unless an overload condition causes reduced running speed, along with reduced voltage across the start winding.\r\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003e6. Higher current switches can be used in place of lower rated switches of the same series.\r\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003e\u003c\/p\u003e\n\u003ch3\u003e Line Voltage Compensation Charts\u003c\/h3\u003e\r\u003cbr\u003e\u003cp\u003e  Induced voltage across the start winding is directly proportional to motor speed and line voltage. All SINPAC Switches use this voltage to switch the start capacitor out of the circuit. Your motor with a SINPAC Switch must generate a voltage greater than the switch cut-out voltage to assure cut-out of the start capacitor. Refer to charts ABOVE.\r\u003cbr\u003e\u003c\/p\u003e\u003c\/htmlonly\u003e","brand":"Stearns\/Rexnord Corporation","offers":[{"title":"Default Title","offer_id":43915208917085,"sku":"2VR50-310","price":390.26,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0704\/4005\/8973\/files\/A1I52HBLP6QUF8U0.jpg?v=1766448515"},{"product_id":"477104012u03-stearns-sinpac-electronic-switch","title":"477104012U03 Stearns SINPAC Electronic Switch","description":"\u003chtmlonly\u003e\r\u003cbr\u003e\u003clink rel=\"stylesheet\" href=\"\/Static\/css\/VendorBranding\/Genericproduct.css\"\u003e\r\u003cbr\u003e\t\u003cheader class=\"productspecifications-header\"\u003e\r\u003cbr\u003e\t\t\u003ch3\u003eVR Series for 115 Vac or 115\/230 Vac Dual Voltage Capacitor Start\/Capacitor Run Motors\u003c\/h3\u003e\r\u003cbr\u003e\t\u003c\/header\u003e\r\u003cbr\u003e\u003ch3\u003e\u003c\/h3\u003e\n\u003cp\u003eBasic Operation\r\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003e  Capacitor start\/capacitor run motors provide continuous voltage sensing information which can be used to extract speed data from the voltage across the motor start winding. By comparing this start winding RPM-sensitive voltage to the main AC input voltage (which serves as a reference voltage), the switch determines when the start circuit should be de-energized. The electronic switch interrupts the start circuit current after the motor has accelerated to the cut out voltage (speed), and reconnects the start circuit whenever the speed sensitive circuit senses the motor voltage (speed) has decreased to a preselected cut in voltage (RPM) level.\r\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003e  Capacitor start\/capacitor run motors exhibit current transients and higher voltages across the start switch. These electrical stresses occur due to the switching of the two capacitors (start and run) that are connected in parallel during motor start and may have different voltages at time of restart. These stresses occur at restart with both mechanical and electronic start switches. The VR switch features circuitry designed to eliminate the effects of these conditions.\r\u003cbr\u003e\r\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003e1. Bleeder Resistor:\u003c\/b\u003e Increases start capacitor life.\r\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003e2. Electrically Protected:\u003c\/b\u003e Designed to filter out electrical noise, so there is no concern of random switch malfunction.\r\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003e3. Reduced Installation Time:\u003c\/b\u003e Easily accessible 1\/4 inch terminals and mounting, reduce the amount of time required to install SINPAC Switches or to change out mechanical switches.\r\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003e4. Restart Capability:\u003c\/b\u003e When motor speed drops below 50% of synchronous speed, the start circuit is reconnected to reinitiate starting torque.\r\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003e5. Soldered Heat Sink:\u003c\/b\u003e High cycling. (Not shown)\r\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003e6. Transient Protection:\u003c\/b\u003e Transient protection tested per IEEE C62.41 – 1991 Category A3.\r\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003e7. Universal Design:\u003c\/b\u003e 50\/60 Hz operation. Will work on 2, 4 or 6 pole motors of any manufacturer. Reduced inventory.\r\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003e8. Zero Voltage Detection Logic\/Inductor:\u003c\/b\u003e Current spiking due to run capacitor no longer a problem.\r\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003e9. Line Voltage Compensation:\u003c\/b\u003e No modifications or changes are required for line voltage variations. SINPAC Switches will operate in areas susceptible to brown-outs or low voltage due to long wiring runs. Line voltage compansation results in less stress on the starting capacitor due to overvoltage.\r\u003cbr\u003e\r\u003cbr\u003e\u003c\/p\u003e\n\u003cdiv class=\"productspecifications\"\u003e\r\u003cbr\u003e\t\t\u003ch3\u003eGeneral Information\u003c\/h3\u003e\r\u003cbr\u003e\t\u003ctable\u003e\r\u003cbr\u003e\t\t\u003ctbody\u003e\r\u003cbr\u003e\t\t\t\u003ctr\u003e\r\u003cbr\u003e\t\t\t\t\u003cth\u003eTypical Max Motor Horsepower (HP)\u003c\/th\u003e\r\u003cbr\u003e\t\t\t\t\u003ctd\u003e2 HP\u003c\/td\u003e\r\u003cbr\u003e\t\t\t\u003c\/tr\u003e\r\u003cbr\u003e\t\t\t\u003ctr\u003e\r\u003cbr\u003e\t\t\t\t\u003cth\u003eTypical Full Load Motor Nameplate Current Rating (Amps)\u003c\/th\u003e\r\u003cbr\u003e\t\t\t\t\u003ctd\u003e20 Amps @ 115 Volts\u003cbr\u003e20\/10 Amps @ 115\/230 Volts\u003c\/td\u003e\r\u003cbr\u003e\t\t\t\u003c\/tr\u003e\r\u003cbr\u003e\t\t\t\u003ctr\u003e\r\u003cbr\u003e\t\t\t\t\u003cth\u003eSwitch Rating \u0026amp; Permissible Maximum Start Circuit Current (Amps)\u003c\/th\u003e\r\u003cbr\u003e\t\t\t\t\u003ctd\u003e40 Amps\u003c\/td\u003e\r\u003cbr\u003e\t\t\t\u003c\/tr\u003e\r\u003cbr\u003e\t\t\t\u003ctr\u003e\r\u003cbr\u003e\t\t\t\t\u003cth\u003eStart Circuit Voltage\u003c\/th\u003e\r\u003cbr\u003e\t\t\t\t\u003ctd\u003e115\u003c\/td\u003e\r\u003cbr\u003e\t\t\t\u003c\/tr\u003e\r\u003cbr\u003e\t\t\t\u003ctr\u003e\r\u003cbr\u003e\t\t\t\t\u003cth\u003eCut Out Voltage (Typical)\u003c\/th\u003e\r\u003cbr\u003e\t\t\t\t\u003ctd\u003e165 Volts\u003c\/td\u003e\r\u003cbr\u003e\t\t\t\u003c\/tr\u003e\r\u003cbr\u003e\t\t\t\u003ctr\u003e\r\u003cbr\u003e\t\t\t\t\u003cth\u003eCut In Voltage Typical\u003c\/th\u003e\r\u003cbr\u003e\t\t\t\t\u003ctd\u003e37 Volts\u003c\/td\u003e\r\u003cbr\u003e\t\t\t\u003c\/tr\u003e\r\u003cbr\u003e\t\t\t\u003ctr\u003e\r\u003cbr\u003e\t\t\t\t\u003cth\u003ePackage Style\u003c\/th\u003e\r\u003cbr\u003e\t\t\t\t\u003ctd\u003e12\u003c\/td\u003e\r\u003cbr\u003e\t\t\t\u003c\/tr\u003e\r\u003cbr\u003e\t\t\t\u003ctr\u003e\r\u003cbr\u003e\t\t\t\t\u003cth\u003eCatalog Number\u003c\/th\u003e\r\u003cbr\u003e\t\t\t\t\u003ctd\u003eVR-40-165\u003c\/td\u003e\r\u003cbr\u003e\t\t\t\u003c\/tr\u003e\r\u003cbr\u003e\t\t\t\u003ctr\u003e\r\u003cbr\u003e\t\t\t\t\u003cth\u003ePart Number\u003c\/th\u003e\r\u003cbr\u003e\t\t\t\t\u003ctd\u003eStearns 4-7-71040-12-U03\u003cbr\u003eReplaces old Stearns 4-7-71040-12-U01\u003cbr\u003eStearns Kit with Gasket 4-7-71040-12-U0K\u003cbr\u003eLeeson 002788.01\u003c\/td\u003e\r\u003cbr\u003e\t\t\t\u003c\/tr\u003e\r\u003cbr\u003e\t\t\t\u003ctr\u003e\r\u003cbr\u003e\t\t\t\t\u003cth\u003eOperating Temperature\u003c\/th\u003e\r\u003cbr\u003e\t\t\t\t\u003ctd\u003e-40°C to 65 °C (-40 °F to 149°F)\u003cbr\u003efor operation between 65°C and 85°C (149°F and 185°F), consult factory.\u003c\/td\u003e\r\u003cbr\u003e\t\t\t\u003c\/tr\u003e\r\u003cbr\u003e\t\t\t\u003ctr\u003e\r\u003cbr\u003e\t\t\t\t\u003cth\u003eOperating Voltage\u003c\/th\u003e\r\u003cbr\u003e\t\t\t\t\u003ctd\u003e115 Vac SINPAC Switch: 90-130 Vac.\u003cbr\u003eFor dual voltage motor equipped with center-tapped main winding: 90-130 Vac or 180-265 Vac.\u003c\/td\u003e\r\u003cbr\u003e\t\t\t\u003c\/tr\u003e\r\u003cbr\u003e\t\t\t\u003ctr\u003e\r\u003cbr\u003e\t\t\t\t\u003cth colspan=\"2\"\u003e UL Recognition (E71115) to US and Canadian Standards\u003c\/th\u003e\r\u003cbr\u003e\t\t\t\u003c\/tr\u003e\r\u003cbr\u003e\t\t\u003c\/tbody\u003e\r\u003cbr\u003e\t\u003c\/table\u003e\r\u003cbr\u003e\r\u003cbr\u003e\u003cp\u003e\u003c\/p\u003e\n\u003ch3\u003eAdditional Features\u003c\/h3\u003e\r\u003cbr\u003e\u003cp\u003e\u003cb\u003eEnvironmentally Protected: \u003c\/b\u003eImmune to moisture, dust, dirt, shock and vibration.\r\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eCompletely Solid-State with No Moving Parts: \u003c\/b\u003e SINPAC Switches have no physical constraints to affect their operation. No wearing parts mean high cycling, no arcing contact. Low warranty.\r\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eSilent Operation: \u003c\/b\u003eNo switch noise\r\u003cbr\u003e\u003c\/p\u003e\n\u003c\/div\u003e\r\u003cbr\u003e\u003cp\u003e\u003c\/p\u003e\n\u003ch3\u003eSelection\u003c\/h3\u003e\r\u003cbr\u003e\u003cp\u003eMotor hp ratings are typical. For an accurate selection procedure, measure start capacitor current during a normal start or at locked rotor and select a SINPAC Switch with higher maximum current rating than that measured.\r\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003e1. Be sure switch series matches motor type.\r\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003e2. Be sure switch voltage rating matches auxiliary (start) circuit voltage rating.\r\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003e3. Selection can be based on actual measurement of start capacitor current or two times the motor nameplate FLA rating.\r\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003e4. Switch current rating must match or exceed the motor start capacitor current requirements. Always select a SINPAC Switch with the next higher current rating for:\r\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003e  a) High cycling applications.\r\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003e  b) Long acceleration time.\r\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003e  c) High ambients: Greater than 55° C.\r\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003e5. To assure proper motor operation, the voltage across the start winding must reach the SINPAC Switch cut out reference voltage between 70% to 85% of motors synchronous speed.\r\u003cbr\u003eSINPAC Switches are line voltage compensated. Changes in the line voltage will not effect system operation unless an overload condition causes reduced running speed, along with reduced voltage across the start winding.\r\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003e6. Higher current switches can be used in place of lower rated switches of the same series.\r\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003e\u003c\/p\u003e\n\u003ch3\u003e Line Voltage Compensation Charts\u003c\/h3\u003e\r\u003cbr\u003e\u003cp\u003e  Induced voltage across the start winding is directly proportional to motor speed and line voltage. All SINPAC Switches use this voltage to switch the start capacitor out of the circuit. Your motor with a SINPAC Switch must generate a voltage greater than the switch cut-out voltage to assure cut-out of the start capacitor. Refer to charts ABOVE.\r\u003cbr\u003e\u003c\/p\u003e\u003c\/htmlonly\u003e","brand":"Stearns\/Rexnord Corporation","offers":[{"title":"Default Title","offer_id":43915297980509,"sku":"VR40-165","price":150.13,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0704\/4005\/8973\/files\/2RU950LAQ6QUF8U0.jpg?v=1766444112"},{"product_id":"477105012u03-stearns-sinpac-electronic-switch","title":"477105012U03 Stearns SINPAC Electronic Switch","description":"\u003chtmlonly\u003e\r\u003cbr\u003e\u003clink rel=\"stylesheet\" href=\"\/Static\/css\/VendorBranding\/Genericproduct.css\"\u003e\r\u003cbr\u003e\t\u003cheader class=\"productspecifications-header\"\u003e\r\u003cbr\u003e\t\t\u003ch3\u003eVR Series for 115 Vac or 115\/230 Vac Dual Voltage Capacitor Start\/Capacitor Run Motors\u003c\/h3\u003e\r\u003cbr\u003e\t\u003c\/header\u003e\r\u003cbr\u003e\u003ch3\u003e\u003c\/h3\u003e\n\u003cp\u003eBasic Operation\r\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003e  Capacitor start\/capacitor run motors provide continuous voltage sensing information which can be used to extract speed data from the voltage across the motor start winding. By comparing this start winding RPM-sensitive voltage to the main AC input voltage (which serves as a reference voltage), the switch determines when the start circuit should be de-energized. The electronic switch interrupts the start circuit current after the motor has accelerated to the cut out voltage (speed), and reconnects the start circuit whenever the speed sensitive circuit senses the motor voltage (speed) has decreased to a preselected cut in voltage (RPM) level.\r\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003e  Capacitor start\/capacitor run motors exhibit current transients and higher voltages across the start switch. These electrical stresses occur due to the switching of the two capacitors (start and run) that are connected in parallel during motor start and may have different voltages at time of restart. These stresses occur at restart with both mechanical and electronic start switches. The VR switch features circuitry designed to eliminate the effects of these conditions.\r\u003cbr\u003e\r\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003e1. Bleeder Resistor:\u003c\/b\u003e Increases start capacitor life.\r\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003e2. Electrically Protected:\u003c\/b\u003e Designed to filter out electrical noise, so there is no concern of random switch malfunction.\r\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003e3. Reduced Installation Time:\u003c\/b\u003e Easily accessible 1\/4 inch terminals and mounting, reduce the amount of time required to install SINPAC Switches or to change out mechanical switches.\r\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003e4. Restart Capability:\u003c\/b\u003e When motor speed drops below 50% of synchronous speed, the start circuit is reconnected to reinitiate starting torque.\r\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003e5. Soldered Heat Sink:\u003c\/b\u003e High cycling. (Not shown)\r\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003e6. Transient Protection:\u003c\/b\u003e Transient protection tested per IEEE C62.41 – 1991 Category A3.\r\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003e7. Universal Design:\u003c\/b\u003e 50\/60 Hz operation. Will work on 2, 4 or 6 pole motors of any manufacturer. Reduced inventory.\r\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003e8. Zero Voltage Detection Logic\/Inductor:\u003c\/b\u003e Current spiking due to run capacitor no longer a problem.\r\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003e9. Line Voltage Compensation:\u003c\/b\u003e No modifications or changes are required for line voltage variations. SINPAC Switches will operate in areas susceptible to brown-outs or low voltage due to long wiring runs. Line voltage compansation results in less stress on the starting capacitor due to overvoltage.\r\u003cbr\u003e\r\u003cbr\u003e\u003c\/p\u003e\n\u003cdiv class=\"productspecifications\"\u003e\r\u003cbr\u003e\t\t\u003ch3\u003eGeneral Information\u003c\/h3\u003e\r\u003cbr\u003e\t\u003ctable\u003e\r\u003cbr\u003e\t\t\u003ctbody\u003e\r\u003cbr\u003e\t\t\t\u003ctr\u003e\r\u003cbr\u003e\t\t\t\t\u003cth\u003eTypical Max Motor Horsepower (HP)\u003c\/th\u003e\r\u003cbr\u003e\t\t\t\t\u003ctd\u003e3 HP\u003c\/td\u003e\r\u003cbr\u003e\t\t\t\u003c\/tr\u003e\r\u003cbr\u003e\t\t\t\u003ctr\u003e\r\u003cbr\u003e\t\t\t\t\u003cth\u003eTypical Full Load Motor Nameplate Current Rating (Amps)\u003c\/th\u003e\r\u003cbr\u003e\t\t\t\t\u003ctd\u003e25 Amps @ 115 Volts\u003cbr\u003e25\/12.5 Amps @ 115\/230 Volts\u003c\/td\u003e\r\u003cbr\u003e\t\t\t\u003c\/tr\u003e\r\u003cbr\u003e\t\t\t\u003ctr\u003e\r\u003cbr\u003e\t\t\t\t\u003cth\u003eSwitch Rating \u0026amp; Permissible Maximum Start Circuit Current (Amps)\u003c\/th\u003e\r\u003cbr\u003e\t\t\t\t\u003ctd\u003e50 Amps\u003c\/td\u003e\r\u003cbr\u003e\t\t\t\u003c\/tr\u003e\r\u003cbr\u003e\t\t\t\u003ctr\u003e\r\u003cbr\u003e\t\t\t\t\u003cth\u003eStart Circuit Voltage\u003c\/th\u003e\r\u003cbr\u003e\t\t\t\t\u003ctd\u003e115 Volts\u003c\/td\u003e\r\u003cbr\u003e\t\t\t\u003c\/tr\u003e\r\u003cbr\u003e\t\t\t\u003ctr\u003e\r\u003cbr\u003e\t\t\t\t\u003cth\u003eCut Out Voltage (Typical)\u003c\/th\u003e\r\u003cbr\u003e\t\t\t\t\u003ctd\u003e165 Volts\u003c\/td\u003e\r\u003cbr\u003e\t\t\t\u003c\/tr\u003e\r\u003cbr\u003e\t\t\t\u003ctr\u003e\r\u003cbr\u003e\t\t\t\t\u003cth\u003eCut In Voltage Typical\u003c\/th\u003e\r\u003cbr\u003e\t\t\t\t\u003ctd\u003e37 Volts\u003c\/td\u003e\r\u003cbr\u003e\t\t\t\u003c\/tr\u003e\r\u003cbr\u003e\t\t\t\u003ctr\u003e\r\u003cbr\u003e\t\t\t\t\u003cth\u003ePackage Style\u003c\/th\u003e\r\u003cbr\u003e\t\t\t\t\u003ctd\u003e12\u003c\/td\u003e\r\u003cbr\u003e\t\t\t\u003c\/tr\u003e\r\u003cbr\u003e\t\t\t\u003ctr\u003e\r\u003cbr\u003e\t\t\t\t\u003cth\u003eCatalog Number\u003c\/th\u003e\r\u003cbr\u003e\t\t\t\t\u003ctd\u003eVR-50-165\u003c\/td\u003e\r\u003cbr\u003e\t\t\t\u003c\/tr\u003e\r\u003cbr\u003e\t\t\t\u003ctr\u003e\r\u003cbr\u003e\t\t\t\t\u003cth\u003ePart Number\u003c\/th\u003e\r\u003cbr\u003e\t\t\t\t\u003ctd\u003eStearns 4-7-71050-12-U03\u003cbr\u003eStearns Kit with Gasket 4-7-71050-12-U0K\u003c\/td\u003e\r\u003cbr\u003e\t\t\t\u003c\/tr\u003e\r\u003cbr\u003e\t\t\t\u003ctr\u003e\r\u003cbr\u003e\t\t\t\t\u003cth\u003eOperating Temperature\u003c\/th\u003e\r\u003cbr\u003e\t\t\t\t\u003ctd\u003e-40°C to 65 °C (-40 °F to 149°F)\u003cbr\u003efor operation between 65°C and 85°C (149°F and 185°F), consult factory.\u003c\/td\u003e\r\u003cbr\u003e\t\t\t\u003c\/tr\u003e\r\u003cbr\u003e\t\t\t\u003ctr\u003e\r\u003cbr\u003e\t\t\t\t\u003cth\u003eOperating Voltage\u003c\/th\u003e\r\u003cbr\u003e\t\t\t\t\u003ctd\u003e115 Vac SINPAC Switch: 90-130 Vac.\u003cbr\u003eFor dual voltage motor equipped with center-tapped main winding: 90-130 Vac or 180-265 Vac.\u003c\/td\u003e\r\u003cbr\u003e\t\t\t\u003c\/tr\u003e\r\u003cbr\u003e\t\t\t\u003ctr\u003e\r\u003cbr\u003e\t\t\t\t\u003cth colspan=\"2\"\u003e UL Recognition (E71115) to US and Canadian Standards\u003c\/th\u003e\r\u003cbr\u003e\t\t\t\u003c\/tr\u003e\r\u003cbr\u003e\t\t\u003c\/tbody\u003e\r\u003cbr\u003e\t\u003c\/table\u003e\r\u003cbr\u003e\r\u003cbr\u003e\u003cp\u003e\u003c\/p\u003e\n\u003ch3\u003eAdditional Features\u003c\/h3\u003e\r\u003cbr\u003e\u003cp\u003e\u003cb\u003eEnvironmentally Protected: \u003c\/b\u003eImmune to moisture, dust, dirt, shock and vibration.\r\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eCompletely Solid-State with No Moving Parts: \u003c\/b\u003e SINPAC Switches have no physical constraints to affect their operation. No wearing parts mean high cycling, no arcing contact. Low warranty.\r\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eSilent Operation: \u003c\/b\u003eNo switch noise\r\u003cbr\u003e\u003c\/p\u003e\n\u003c\/div\u003e\r\u003cbr\u003e\u003cp\u003e\u003c\/p\u003e\n\u003ch3\u003eSelection\u003c\/h3\u003e\r\u003cbr\u003e\u003cp\u003eMotor hp ratings are typical. For an accurate selection procedure, measure start capacitor current during a normal start or at locked rotor and select a SINPAC Switch with higher maximum current rating than that measured.\r\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003e1. Be sure switch series matches motor type.\r\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003e2. Be sure switch voltage rating matches auxiliary (start) circuit voltage rating.\r\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003e3. Selection can be based on actual measurement of start capacitor current or two times the motor nameplate FLA rating.\r\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003e4. Switch current rating must match or exceed the motor start capacitor current requirements. Always select a SINPAC Switch with the next higher current rating for:\r\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003e  a) High cycling applications.\r\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003e  b) Long acceleration time.\r\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003e  c) High ambients: Greater than 55° C.\r\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003e5. To assure proper motor operation, the voltage across the start winding must reach the SINPAC Switch cut out reference voltage between 70% to 85% of motors synchronous speed.\r\u003cbr\u003eSINPAC Switches are line voltage compensated. Changes in the line voltage will not effect system operation unless an overload condition causes reduced running speed, along with reduced voltage across the start winding.\r\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003e6. Higher current switches can be used in place of lower rated switches of the same series.\r\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003e\u003c\/p\u003e\n\u003ch3\u003e Line Voltage Compensation Charts\u003c\/h3\u003e\r\u003cbr\u003e\u003cp\u003e  Induced voltage across the start winding is directly proportional to motor speed and line voltage. All SINPAC Switches use this voltage to switch the start capacitor out of the circuit. Your motor with a SINPAC Switch must generate a voltage greater than the switch cut-out voltage to assure cut-out of the start capacitor. Refer to charts ABOVE.\r\u003cbr\u003e\u003c\/p\u003e\u003c\/htmlonly\u003e","brand":"Stearns\/Rexnord Corporation","offers":[{"title":"Default Title","offer_id":43915298013277,"sku":"VR50-165","price":187.08,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0704\/4005\/8973\/files\/KR2A7BLAQ6QUF8U0.jpg?v=1766444112"}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0704\/4005\/8973\/collections\/CAS8L6G7T8K0FAR0.jpg?v=1766430646","url":"https:\/\/witmermotor.com\/collections\/vr-2vr-series.oembed","provider":"Witmer Motor Service","version":"1.0","type":"link"}