Power Monitoring and Protection

50R Series

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50R Series

MotorSaver™ Single-Phase Voltage Monitor 50R Series

MotorSaver™ Single-Phase Voltage Monitor


The MotorSaver™ 50R Series single-phase voltage monitor voltage sensing circuit constantly monitors the single-phase power for a low voltage condition. When a harmful condition is detected, the 50R Series output relay is deactivated after a fixed trip delay time. The output relay reactivates after power line conditions return to an acceptable level for a fixed restart time delay period. The trip delay prevents nuisance tripping due to rapidly fluctuating power line conditions. Single-phase motors on fans, compressors, air conditioners, heat pumps, water pumps, and small conveyor motors can be protected by the 50R Series.


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QtyModelDescriptionIn StockList PriceInternet Price
50R-100 1PH VOLT MONITOR 95-120V SPDTINFO359.00201.04
50R-200 1PH VOLT MONITOR 190-240V SPDTIn Stock364.00203.84


No accessories found
  • Single-phase motor protection from low voltage conditions
  • Two-color LED for normal and fault condition indication
  • General-purpose relay for switching loads up to 10A at 240 VAC
  • UL and ULC listed

Frequency:50* or 60 Hz

Contact Rating:SPDT, 10A general-purpose or 480 VA @ 240 VAC

Line Voltage Monitored:

 :50R-100 95-120 VAC

 :50R-200 190-240 VAC

Low Voltage Trip:90% of set point

Low Voltage Reset:93% of set point

Reset Delay Time after Power Loss:2 seconds

Trip Delay Time Low Voltage:2 seconds

Weight:1.0 lb (0.45 kg)

Approvals:UL and cUL listed, file #E68520

Warranty:5 years