50R Series – Single-Phase Voltage Monitor Series - Littelfuse 50R Voltage Monitoring Relays Provide Superior Protection

Series: 50R Series – Single-Phase Voltage Monitor
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50R
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Littelfuse products are not designed for, and shall not be used for, any purpose (including, without limitation, automotive, military, aerospace, medical, life-saving, life-sustaining or nuclear facility applications, devices intended for surgical implant into the body, or any other application in which the failure or lack of desired operation of the product may result in personal injury, death, or property damage) other than those expressly set forth in applicable Littelfuse product documentation. Warranties granted by Littelfuse shall be deemed void for products used for any purpose not expressly set forth in applicable Littelfuse documentation. Littelfuse shall not be liable for any claims or damages arising out of products used in applications not expressly intended by Littelfuse as set forth in applicable Littelfuse documentation. The sale and use of Littelfuse products is subject to Littelfuse Terms and Conditions of Sale, unless otherwise agreed by Littelfuse. "Littelfuse" includes Littelfuse, Inc., and all of its affiliate entities.

The 50R series is a single-phase voltage monitor with a voltage-sensing circuit that constantly monitors the single-phase power for a low-voltage condition. When a harmful condition is detected, the MotorSaver’s output relay is deactivated after a specified trip delay. The output relay reactivates after power line conditions return to an acceptable level and a specified amount of time has elapsed (restart delay). The trip delay prevents nuisance tripping due to rapidly fluctuating power line conditions. This monitor is used in a variety of applications such as compressors, air conditioners, heat pumps, well pumps, sump pumps, and small conveyer motors.

Features

  • Proprietary voltage sensing circuitry
  • Adjustable trip delay (-3 models) and restart delay (-2 models) settings
  • High-voltage detection (-9 models)
  • 600 V rated relay contacts available on some models

Product Literature

For Technical Questions

Call +1 800-832-3873 or email us at relays@littelfuse.com 

Access specifications, certifications, check availability and order parts below

Catalog #Input
Voltage (V)		Output
Form		Termination TypeMounting MethodDimensionsWeight (lbs/g)HumidityInput AC Line Frequency (Hz)Maximum Input PowerOutput Load Rating (VA)Overvoltage Reset Voltage (%)Overvoltage Trip Voltage (%)Restart Delay RangeStorage Temperature (F/C)Trip Delay RangeStockSamplesCompare
50R-10095 - 120 VacSPDT - 1 Form CTorque: 7 in-lbs; Wire Size: 12 - 18 AWG#8 screws2.93 H x 5.27 W x 2.95 D in. (74.4 x 133.9 x 74.9 mm)0 Kg10 - 95% non-condensing per IEC 68-2-350 / 60 (50 will increase all delay timers by 20%)5Pilot Duty: 480 VA @ 240 Vac; General Purpose: 10 A @ 240 VacUndervoltage: 2 s; Complete Power Loss: 2 s-40° to 80°C (-40° to 176°F)4 sCheckOrder
50R-100-295 - 120 VacSPDT - 1 Form CTorque: 7 in-lbs; Wire Size: 12 - 18 AWG#8 screws2.93 H x 5.27 W x 2.95 D in. (74.4 x 133.9 x 74.9 mm)0 Kg10 - 95% non-condensing per IEC 68-2-350 / 60 (50 will increase all delay timers by 20%)5Pilot Duty: 480 VA @ 240 Vac; General Purpose: 10 A @ 240 VacManual; 2 - 300 s-40° to 80°C (-40° to 176°F)4 sCheckOrder
50R200190 - 240 VacSPDT - 1 Form CTorque: 7 in-lbs; Wire Size: 12 - 18 AWG#8 screws2.93 H x 5.27 W x 2.95 D in. (74.4 x 133.9 x 74.9 mm)0 Kg10 - 95% non-condensing per IEC 68-2-350 / 60 (50 will increase all delay timers by 20%)5Pilot Duty: 480 VA @ 240 Vac; General Purpose: 10 A @ 240 VacUndervoltage: 2 s; Complete Power Loss: 2 s-40° to 80°C (-40° to 176°F)4 sCheckOrder
50R2002190 - 240 VacSPDT - 1 Form CTorque: 7 in-lbs; Wire Size: 12 - 18 AWG#8 screws2.93 H x 5.27 W x 2.95 D in. (74.4 x 133.9 x 74.9 mm)0 Kg10 - 95% non-condensing per IEC 68-2-350 / 60 (50 will increase all delay timers by 20%)5Pilot Duty: 480 VA @ 240 Vac; General Purpose: 10 A @ 240 VacManual; 2 - 300 s-40° to 80°C (-40° to 176°F)4 sCheckOrder
50R20029190 - 240 VacSPDT - 1 Form CTorque: 7 in-lbs; Wire Size: 12 - 18 AWG#8 screws2.93 H x 5.27 W x 2.95 D in. (74.4 x 133.9 x 74.9 mm)0 Kg10 - 95% non-condensing per IEC 68-2-350 / 60 (50 will increase all delay timers by 20%)5Pilot Duty: 480 VA @ 240 Vac; General Purpose: 10 A @ 240 Vac107%110%Manual; 2 - 300 s-40° to 80°C (-40° to 176°F)4 sCheckOrder
50R2003190 - 240 VacSPDT - 1 Form CTorque: 7 in-lbs; Wire Size: 12 - 18 AWG#8 screws2.93 H x 5.27 W x 2.95 D in. (74.4 x 133.9 x 74.9 mm)0 Kg10 - 95% non-condensing per IEC 68-2-350 / 60 (50 will increase all delay timers by 20%)5Pilot Duty: 480 VA @ 240 Vac; General Purpose: 10 A @ 240 VacUndervoltage: 2 s; Complete Power Loss: 2 s-40° to 80°C (-40° to 176°F)2 - 30 sCheckOrder
50R400380 - 480 VacSPDT - 1 Form CTorque: 7 in-lbs; Wire Size: 12 - 18 AWG#8 screws2.93 H x 5.27 W x 2.95 D in. (74.4 x 133.9 x 74.9 mm)0 Kg10 - 95% non-condensing per IEC 68-2-350 / 60 (50 will increase all delay timers by 20%)5Pilot Duty: 470 VA @ 600 Vac; General Purpose: 10 A @ 240 VacUndervoltage: 2 s; Complete Power Loss: 2 s-40° to 80°C (-40° to 176°F)4 sCheckOrder
50R4002380 - 480 VacSPDT - 1 Form CTorque: 7 in-lbs; Wire Size: 12 - 18 AWG#8 screws2.93 H x 5.27 W x 2.95 D in. (74.4 x 133.9 x 74.9 mm)0 Kg10 - 95% non-condensing per IEC 68-2-350 / 60 (50 will increase all delay timers by 20%)5Pilot Duty: 470 VA @ 600 Vac; General Purpose: 10 A @ 240 VacManual; 2 - 300 s-40° to 80°C (-40° to 176°F)4 sCheckOrder
50R40029380 - 480 VacSPDT - 1 Form CTorque: 7 in-lbs; Wire Size: 12 - 18 AWG#8 screws2.93 H x 5.27 W x 2.95 D in. (74.4 x 133.9 x 74.9 mm)0 Kg10 - 95% non-condensing per IEC 68-2-350 / 60 (50 will increase all delay timers by 20%)5Pilot Duty: 470 VA @ 600 Vac; General Purpose: 10 A @ 240 Vac107%110%Manual; 2 - 300 s-40° to 80°C (-40° to 176°F)4 sCheckOrder
50R4003380 - 480 VacSPDT - 1 Form CTorque: 7 in-lbs; Wire Size: 12 - 18 AWG#8 screws2.93 H x 5.27 W x 2.95 D in. (74.4 x 133.9 x 74.9 mm)0 Kg10 - 95% non-condensing per IEC 68-2-350 / 60 (50 will increase all delay timers by 20%)5Pilot Duty: 470 VA @ 600 Vac; General Purpose: 10 A @ 240 VacUndervoltage: 2 s; Complete Power Loss: 2 s-40° to 80°C (-40° to 176°F)2 - 30 sCheckOrder
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