{"title":"355\/455","description":"","products":[{"product_id":"littelfuse-355-200-three-phase-voltage-phase-monitor","title":"Littelfuse 355-200 Three-Phase Voltage\/Phase Monitor","description":"\u003cp\u003e\n\u003cimg data-image=\"1l9tsjtw0igc\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0857\/5552\/7485\/files\/littelfuse1_logo.jpg\" title=\"Littelfuse your electronic and control \u0026amp; protection specialists\"\u003e\n\u003c\/p\u003e\n\u003ch3\u003eLittelfuse 355-200 Voltage Monitor Product Description\u003c\/h3\u003e\n\u003cp\u003e\n\tThe 355 is a 3-phase voltage monitor with adjustable trip and restart delay, adjustable voltage unbalance and multiple diagnostic lights. It is perfect for heavy-duty applications that need both protection and simple user-friendly diagnostics. Applications include pump panels, commercial HVAC, oil rigs and others.\n\u003c\/p\u003e\n\u003cp\u003e\n\tThe 355 uses microcontroller technology to monitor incoming voltage and de-energize its output relay if power problems exist. The 355 can protect motors from damage caused by single-phasing, high and low voltage, phase reversal and voltage unbalance. It has four diagnostic LEDs that clearly show overvoltage, undervoltage, voltage unbalance, reverse-phase and normal conditions.\n\u003c\/p\u003e\n\u003cp\u003e\n\tThe 355-200 is equipped with a heavy-duty 10A general purpose SPDT relay. The 355-400 and 355-600 are equipped with a 470VA @ 600VAC pilot duty SPDT relay. A high voltage (600V) DPDT relay output option is available with the 400V model.\n\u003c\/p\u003e\n\u003ch3\u003eLittelfuse 355-200 Voltage Monitor Typical Applications\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eFans\u003c\/li\u003e\n\u003cli\u003eCompressors\u003c\/li\u003e\n\u003cli\u003eHVAC\u003c\/li\u003e\n\u003cli\u003eHeat Pumps\u003c\/li\u003e\n\u003cli\u003eWell Pumps\u003c\/li\u003e\n\u003cli\u003eSump Pumps\u003c\/li\u003e\n\u003cli\u003eSmall Conveyor Motors\u003c\/li\u003e\n\u003cli\u003eOil Rigs\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eLittelfuse 355-200 Voltage Monitor  Features\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cb\u003eProprietary Microcontroller Based Circuitry:\u003c\/b\u003e Constantly Monitors 3 Phase Voltage to Protect Against Harmful Line Conditions, Even Before the Motor is Started\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eAdvanced LED Indication:\u003c\/b\u003e Provides Diagnostics which can be Used for Troubleshooting and to Determine Relay Status\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eAdjustable Trip and Restart Delay Settings:\u003c\/b\u003e Prevent Nuisance Tripping Due to Rapidly Fluctuating Power Line Conditions and Allows Staggered Start Up of Multiple Monitors, After a Fault to Prevent a Low Voltage Condition\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eCombines Protection and Diagnostics:\u003c\/b\u003e Perfect for Heavy Duty Applications: Pump Panels, Commercial HVAC and Oil Rigs\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003e600V Rated Relay Contacts Available on Some Models:\u003c\/b\u003e Eliminates the Need for a Control Transformer to Step Voltage Down to 120-240V for a Control Circuit\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Littelfuse\/Symcom","offers":[{"title":"Default Title","offer_id":49325228785981,"sku":"MSR355200","price":408.01,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0857\/5552\/7485\/files\/msr355xxx_001_wbg.jpg?v=1725424938"},{"product_id":"littelfuse-355-400-three-phase-voltage-phase-monitor","title":"Littelfuse 355-400 Three-Phase Voltage\/Phase Monitor","description":"\u003cp\u003e\n\u003cimg data-image=\"1l9tsjtw0igc\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0857\/5552\/7485\/files\/littelfuse1_logo.jpg\" title=\"Littelfuse your electronic and control \u0026amp; protection specialists\"\u003e\n\u003c\/p\u003e\n\u003ch3\u003e\nLittelfuse 355-400 Voltage Monitor Product Description\u003c\/h3\u003e\n\u003cp\u003e\n\tThe 355 is a 3-phase voltage monitor with adjustable trip and restart delay, adjustable voltage unbalance and multiple diagnostic lights. It is perfect for heavy-duty applications that need both protection and simple user-friendly diagnostics. Applications include pump panels, commercial HVAC, oil rigs and others.\n\u003c\/p\u003e\n\u003cp\u003e\n\tThe 355 uses microcontroller technology to monitor incoming voltage and de-energize its output relay if power problems exist. The 355 can protect motors from damage caused by single-phasing, high and low voltage, phase reversal and voltage unbalance. It has four diagnostic LEDs that clearly show overvoltage, undervoltage, voltage unbalance, reverse-phase and normal conditions.\n\u003c\/p\u003e\n\u003cp\u003e\n\tThe 355-200 is equipped with a heavy-duty 10A general purpose SPDT relay. The 355-400 and 355-600 are equipped with a 470VA @ 600VAC pilot duty SPDT relay. A high voltage (600V) DPDT relay output option is available with the 400V model.\n\u003c\/p\u003e\n\u003ch3\u003eLittelfuse 355-400 Voltage Monitor Typical Applications\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eFans\u003c\/li\u003e\n\u003cli\u003eCompressors\u003c\/li\u003e\n\u003cli\u003eHVAC\u003c\/li\u003e\n\u003cli\u003eHeat Pumps\u003c\/li\u003e\n\u003cli\u003eWell Pumps\u003c\/li\u003e\n\u003cli\u003eSump Pumps\u003c\/li\u003e\n\u003cli\u003eSmall Conveyor Motors\u003c\/li\u003e\n\u003cli\u003eOil Rigs\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\nLittelfuse 355-400 Voltage Monitor Features\n\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cb\u003eProprietary Microcontroller Based Circuitry:\u003c\/b\u003e Constantly Monitors 3 Phase Voltage to Protect Against Harmful Line Conditions, Even Before the Motor is Started\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eAdvanced LED Indication:\u003c\/b\u003e Provides Diagnostics which can be Used for Troubleshooting and to Determine Relay Status\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eAdjustable Trip and Restart Delay Settings:\u003c\/b\u003e Prevent Nuisance Tripping Due to Rapidly Fluctuating Power Line Conditions and Allows Staggered Start Up of Multiple Monitors, After a Fault to Prevent a Low Voltage Condition\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eCombines Protection and Diagnostics:\u003c\/b\u003e Perfect for Heavy Duty Applications: Pump Panels, Commercial HVAC and Oil Rigs\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003e600V Rated Relay Contacts Available on Some Models:\u003c\/b\u003e Eliminates the Need for a Control Transformer to Step Voltage Down to 120-240V for a Control Circuit\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Littelfuse\/Symcom","offers":[{"title":"Default Title","offer_id":49325242548541,"sku":"MSR355400","price":408.01,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0857\/5552\/7485\/files\/msr355xxx_001_wbg_a94a0055-73f6-40e7-b9fb-02ef5b4b99ca.jpg?v=1725425161"},{"product_id":"littelfuse-355-400-5-three-phase-voltage-phase-monitor","title":"Littelfuse 355-400-5 Three-Phase Voltage\/Phase Monitor","description":"\u003cp\u003e\n\u003cimg data-image=\"1l9tsjtw0igc\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0857\/5552\/7485\/files\/littelfuse1_logo.jpg\" title=\"Littelfuse your electronic and control \u0026amp; protection specialists\"\u003e\n\u003c\/p\u003e\n\u003ch3\u003e\nLittelfuse 355-400-5 Voltage Monitor Product Description\u003c\/h3\u003e\n\u003cp\u003e\n\tThe 355 is a 3-phase voltage monitor with adjustable trip and restart delay, adjustable voltage unbalance and multiple diagnostic lights. It is perfect for heavy-duty applications that need both protection and simple user-friendly diagnostics. Applications include pump panels, commercial HVAC, oil rigs and others.\n\u003c\/p\u003e\n\u003cp\u003e\n\tThe 355 uses microcontroller technology to monitor incoming voltage and de-energize its output relay if power problems exist. The 355 can protect motors from damage caused by single-phasing, high and low voltage, phase reversal and voltage unbalance. It has four diagnostic LEDs that clearly show overvoltage, undervoltage, voltage unbalance, reverse-phase and normal conditions.\n\u003c\/p\u003e\n\u003cp\u003e\n\tThe 355-200 is equipped with a heavy-duty 10A general purpose SPDT relay. The 355-400 and 355-600 are equipped with a 470VA @ 600VAC pilot duty SPDT relay. A high voltage (600V) DPDT relay output option is available with the 400V model.\n\u003c\/p\u003e\n\u003ch3\u003eLittelfuse 355-400-5 Voltage Monitor Typical Applications\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eFans\u003c\/li\u003e\n\u003cli\u003eCompressors\u003c\/li\u003e\n\u003cli\u003eHVAC\u003c\/li\u003e\n\u003cli\u003eHeat Pumps\u003c\/li\u003e\n\u003cli\u003eWell Pumps\u003c\/li\u003e\n\u003cli\u003eSump Pumps\u003c\/li\u003e\n\u003cli\u003eSmall Conveyor Motors\u003c\/li\u003e\n\u003cli\u003eOil Rigs\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eLittelfuse 355-400-5 Voltage Monitor Features\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cb\u003eProprietary Microcontroller Based Circuitry:\u003c\/b\u003e Constantly Monitors 3 Phase Voltage to Protect Against Harmful Line Conditions, Even Before the Motor is Started\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eAdvanced LED Indication:\u003c\/b\u003e Provides Diagnostics which can be Used for Troubleshooting and to Determine Relay Status\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eAdjustable Trip and Restart Delay Settings:\u003c\/b\u003e Prevent Nuisance Tripping Due to Rapidly Fluctuating Power Line Conditions and Allows Staggered Start Up of Multiple Monitors, After a Fault to Prevent a Low Voltage Condition\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eCombines Protection and Diagnostics:\u003c\/b\u003e Perfect for Heavy Duty Applications: Pump Panels, Commercial HVAC and Oil Rigs\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003e600V Rated Relay Contacts Available on Some Models:\u003c\/b\u003e Eliminates the Need for a Control Transformer to Step Voltage Down to 120-240V for a Control Circuit\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Littelfuse\/Symcom","offers":[{"title":"Default Title","offer_id":49325243334973,"sku":"MSR3554005","price":408.01,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0857\/5552\/7485\/files\/msr355xxx_001_wbg_05856fea-d64d-4979-b9ed-03e50bc5516f.jpg?v=1725425179"},{"product_id":"littelfuse-355-600-three-phase-voltage-phase-monitor","title":"Littelfuse 355-600 Three-Phase Voltage\/Phase Monitor","description":"\u003cp\u003e\n\u003cimg data-image=\"1l9tsjtw0igc\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0857\/5552\/7485\/files\/littelfuse1_logo.jpg\" title=\"Littelfuse your electronic and control \u0026amp; protection specialists\"\u003e\n\u003c\/p\u003e\n\u003ch3\u003e\nLittelfuse 355-600 Voltage Monitor Product Description\u003c\/h3\u003e\n\u003cp\u003e\n\tThe 355 is a 3-phase voltage monitor with adjustable trip and restart delay, adjustable voltage unbalance and multiple diagnostic lights. It is perfect for heavy-duty applications that need both protection and simple user-friendly diagnostics. Applications include pump panels, commercial HVAC, oil rigs and others.\n\u003c\/p\u003e\n\u003cp\u003e\n\tThe 355 uses microcontroller technology to monitor incoming voltage and de-energize its output relay if power problems exist. The 355 can protect motors from damage caused by single-phasing, high and low voltage, phase reversal and voltage unbalance. It has four diagnostic LEDs that clearly show overvoltage, undervoltage, voltage unbalance, reverse-phase and normal conditions.\n\u003c\/p\u003e\n\u003cp\u003e\n\tThe 355-200 is equipped with a heavy-duty 10A general purpose SPDT relay. The 355-400 and 355-600 are equipped with a 470VA @ 600VAC pilot duty SPDT relay. A high voltage (600V) DPDT relay output option is available with the 400V model.\n\u003c\/p\u003e\n\u003ch3\u003eLittelfuse 355-600 Voltage Monitor Typical Applications\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eFans\u003c\/li\u003e\n\u003cli\u003eCompressors\u003c\/li\u003e\n\u003cli\u003eHVAC\u003c\/li\u003e\n\u003cli\u003eHeat Pumps\u003c\/li\u003e\n\u003cli\u003eWell Pumps\u003c\/li\u003e\n\u003cli\u003eSump Pumps\u003c\/li\u003e\n\u003cli\u003eSmall Conveyor Motors\u003c\/li\u003e\n\u003cli\u003eOil Rigs\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eLittelfuse 355-600 Voltage Monitor Features\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cb\u003eProprietary Microcontroller Based Circuitry:\u003c\/b\u003e Constantly Monitors 3 Phase Voltage to Protect Against Harmful Line Conditions, Even Before the Motor is Started\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eAdvanced LED Indication:\u003c\/b\u003e Provides Diagnostics which can be Used for Troubleshooting and to Determine Relay Status\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eAdjustable Trip and Restart Delay Settings:\u003c\/b\u003e Prevent Nuisance Tripping Due to Rapidly Fluctuating Power Line Conditions and Allows Staggered Start Up of Multiple Monitors, After a Fault to Prevent a Low Voltage Condition\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eCombines Protection and Diagnostics:\u003c\/b\u003e Perfect for Heavy Duty Applications: Pump Panels, Commercial HVAC and Oil Rigs\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003e600V Rated Relay Contacts Available on Some Models:\u003c\/b\u003e Eliminates the Need for a Control Transformer to Step Voltage Down to 120-240V for a Control Circuit\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Littelfuse\/Symcom","offers":[{"title":"Default Title","offer_id":49325244350781,"sku":"MSR355600","price":408.01,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0857\/5552\/7485\/files\/msr355xxx_001_wbg_df13ab8e-2f57-46df-bcf6-9eb24f72dbbd.jpg?v=1725425209"},{"product_id":"littelfuse-455-three-phase-voltage-phase-monitor","title":"Littelfuse 455 Three-Phase Voltage\/Phase Monitor","description":"\u003cp\u003e\u003cimg data-image=\"1l9tsjtw0igc\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0857\/5552\/7485\/files\/littelfuse1_logo.jpg\" title=\"Littelfuse your electronic and control \u0026amp; protection specialists\"\u003e\u003c\/p\u003e\n\u003ch3\u003eLittelfuse 455 Voltage Monitor Product Description\u003c\/h3\u003e\n\u003cp\u003eThe 455 Series are 3-phase voltage monitors that combine load and line side monitoring to offer complete protection. Monitoring the load side will alert the user of contactor failure or impending contactor failure. Line side monitoring will also protect the motor from damaging fault conditions that may be present prior to the motor starting. With other line\/load side monitors, the motor must be started before a voltage fault is detected. With the 455, your motor is fully protected at all times.\u003c\/p\u003e\n\u003cp\u003eThe 455 Series are 3-phase, dual range voltage monitors that protect 190-480VAC, 50*\/60Hz motors, regardless of their size. It automatically selects between the 200V and 400V range when the user selects the nominal voltage setpoint. Other adjustments include a 2-30 second trip delay, a 2-300 second restart delay (and manual restart) and a voltage unbalance trip point of 2-8%. The voltage monitor’s circuitry is powered through the line side connections, so there is no need for separate control power, making it easy to install.\u003c\/p\u003e\n\u003cp\u003eEquipped with an infrared LED, the 455 Series can communicate to the optional hand-held diagnostic tool, Informer-MS to obtain valuable information such as real-time voltage, voltage unbalance on both line and load sides, motor run hours, last 20 faults, last 32 motor starts, high and low voltage trip points, voltage unbalance trip\u003c\/p\u003e\n\u003ch3\u003eLittelfuse 455 Voltage Monitor Typical Applications\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eFans\u003c\/li\u003e\n\u003cli\u003eCompressors\u003c\/li\u003e\n\u003cli\u003eHVAC\u003c\/li\u003e\n\u003cli\u003eHeat Pumps\u003c\/li\u003e\n\u003cli\u003eWell Pumps\u003c\/li\u003e\n\u003cli\u003eSump Pumps\u003c\/li\u003e\n\u003cli\u003eSmall Conveyor Motors\u003c\/li\u003e\n\u003cli\u003eOil Rigs\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eLittelfuse 455 Voltage Monitor Features\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cb\u003eLoad Side Monitoring of Contactor:\u003c\/b\u003e Protects Motor from Contactor Failure or Worn Contacts\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eMonitors Contactor or Starter:\u003c\/b\u003e Prevents Rapid Cycling\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eInfrared LED Capable:\u003c\/b\u003e Increases Personnel Safety Line of Sight Monitoring using Optional Informer-MS\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Littelfuse\/Symcom","offers":[{"title":"Default Title","offer_id":49325245006141,"sku":"MSR455","price":289.59,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0857\/5552\/7485\/files\/msr455xxx_001_wbg.jpg?v=1725425227"},{"product_id":"littelfuse-455480r-three-phase-voltage-phase-monitor","title":"Littelfuse 455480R Three-Phase Voltage\/Phase Monitor","description":"\u003cp\u003e\u003cimg data-image=\"1l9tsjtw0igc\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0857\/5552\/7485\/files\/littelfuse1_logo.jpg\" title=\"Littelfuse your electronic and control \u0026amp; protection specialists\"\u003e\u003c\/p\u003e\n\u003ch3\u003eLittelfuse 455480R Voltage Monitor Product Description\u003c\/h3\u003e\n\u003cp\u003eThe 455 Series are 3-phase voltage monitors that combine load and line side monitoring to offer complete protection. Monitoring the load side will alert the user of contactor failure or impending contactor failure. Line side monitoring will also protect the motor from damaging fault conditions that may be present prior to the motor starting. With other line\/load side monitors, the motor must be started before a voltage fault is detected. With the 455, your motor is fully protected at all times.\u003c\/p\u003e\n\u003cp\u003eThe 455 Series are 3-phase, dual range voltage monitors that protect 190-480VAC, 50*\/60Hz motors, regardless of their size. It automatically selects between the 200V and 400V range when the user selects the nominal voltage setpoint. Other adjustments include a 2-30 second trip delay, a 2-300 second restart delay (and manual restart) and a voltage unbalance trip point of 2-8%. The voltage monitor’s circuitry is powered through the line side connections, so there is no need for separate control power, making it easy to install.\u003c\/p\u003e\n\u003cp\u003eEquipped with an infrared LED, the 455 Series can communicate to the optional hand-held diagnostic tool, Informer-MS to obtain valuable information such as real-time voltage, voltage unbalance on both line and load sides, motor run hours, last 20 faults, last 32 motor starts, high and low voltage trip points, voltage unbalance trip\u003c\/p\u003e\n\u003ch3\u003eLittelfuse 455480R Voltage Monitor Typical Applications\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eFans\u003c\/li\u003e\n\u003cli\u003eCompressors\u003c\/li\u003e\n\u003cli\u003eHVAC\u003c\/li\u003e\n\u003cli\u003eHeat Pumps\u003c\/li\u003e\n\u003cli\u003eWell Pumps\u003c\/li\u003e\n\u003cli\u003eSump Pumps\u003c\/li\u003e\n\u003cli\u003eSmall Conveyor Motors\u003c\/li\u003e\n\u003cli\u003eOil Rigs\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eLittelfuse 455480R Voltage Monitor Features\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cb\u003eLoad Side Monitoring of Contactor:\u003c\/b\u003e Protects Motor from Contactor Failure or Worn Contacts\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eMonitors Contactor or Starter:\u003c\/b\u003e Prevents Rapid Cycling\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eInfrared LED Capable:\u003c\/b\u003e Increases Personnel Safety Line of Sight Monitoring using Optional Informer-MS\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Littelfuse\/Symcom","offers":[{"title":"Default Title","offer_id":49325248250173,"sku":"MSR455480R","price":408.01,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0857\/5552\/7485\/files\/msr455xxx_001_wbg_4c005b44-a7a6-487e-9a11-050edc1a7118.jpg?v=1725425297"},{"product_id":"littelfuse-455-575-three-phase-voltage-phase-monitor","title":"Littelfuse 455-575 Three-Phase Voltage\/Phase Monitor","description":"\u003cp\u003e\u003cimg data-image=\"1l9tsjtw0igc\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0857\/5552\/7485\/files\/littelfuse1_logo.jpg\" title=\"Littelfuse your electronic and control \u0026amp; protection specialists\"\u003e\u003c\/p\u003e\n\u003ch3\u003eLittelfuse 455-575 Voltage Monitor Product Description\u003c\/h3\u003e\n\u003cp\u003eThe 455 Series are 3-phase voltage monitors that combine load and line side monitoring to offer complete protection. Monitoring the load side will alert the user of contactor failure or impending contactor failure. Line side monitoring will also protect the motor from damaging fault conditions that may be present prior to the motor starting. With other line\/load side monitors, the motor must be started before a voltage fault is detected. With the 455, your motor is fully protected at all times.\u003c\/p\u003e\n\u003cp\u003eThe 455 Series are 3-phase, dual range voltage monitors that protect 190-480VAC, 50*\/60Hz motors, regardless of their size. It automatically selects between the 200V and 400V range when the user selects the nominal voltage setpoint. Other adjustments include a 2-30 second trip delay, a 2-300 second restart delay (and manual restart) and a voltage unbalance trip point of 2-8%. The voltage monitor’s circuitry is powered through the line side connections, so there is no need for separate control power, making it easy to install.\u003c\/p\u003e\n\u003cp\u003eEquipped with an infrared LED, the 455 Series can communicate to the optional hand-held diagnostic tool, Informer-MS to obtain valuable information such as real-time voltage, voltage unbalance on both line and load sides, motor run hours, last 20 faults, last 32 motor starts, high and low voltage trip points, voltage unbalance trip\u003c\/p\u003e\n\u003ch3\u003eLittelfuse 455-575 Voltage Monitor Typical Applications\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eFans\u003c\/li\u003e\n\u003cli\u003eCompressors\u003c\/li\u003e\n\u003cli\u003eHVAC\u003c\/li\u003e\n\u003cli\u003eHeat Pumps\u003c\/li\u003e\n\u003cli\u003eWell Pumps\u003c\/li\u003e\n\u003cli\u003eSump Pumps\u003c\/li\u003e\n\u003cli\u003eSmall Conveyor Motors\u003c\/li\u003e\n\u003cli\u003eOil Rigs\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eLittelfuse 455-575 Voltage Monitor Features\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cb\u003eLoad Side Monitoring of Contactor:\u003c\/b\u003e Protects Motor from Contactor Failure or Worn Contacts\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eMonitors Contactor or Starter:\u003c\/b\u003e Prevents Rapid Cycling\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eInfrared LED Capable:\u003c\/b\u003e Increases Personnel Safety Line of Sight Monitoring using Optional Informer-MS\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Littelfuse\/Symcom","offers":[{"title":"Default Title","offer_id":49325248577853,"sku":"MSR455575","price":289.59,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0857\/5552\/7485\/files\/msr455xxx_001_wbg_35776758-6e9f-4bd6-8086-ed233fa2a0bd.jpg?v=1725425305"}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0857\/5552\/7485\/collections\/msr455xxx_001_wbg.jpg?v=1727896120","url":"https:\/\/rcworst.com\/collections\/355-455.oembed","provider":"R.C. Worst \u0026 Company Inc","version":"1.0","type":"link"}