50R20029 - 50R Series

Series: 50R Questions? Contact Littelfuse Support
Littelfuse Voltage Monitoring Relays
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The 50R single-phase voltage monitor has a voltage-sensing circuit which constantly monitors the single-phase power for a low voltage condition. Single-phase motors on fans, compressors, air conditioners, heat pumps, well pumps, sump pumps and small conveyor motors are all applicable to the Model 50R.

When a harmful condition is detected, the 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.

Property (Mouseover for details) Value
Input Voltage (V) 190 to 240VAC
Maximum Input Power 5W
Input AC Line Frequency (Hz) 50/60Hz (50Hz will increase all delay timers by 20%.)
Output Form SPDT - 1 Form C
Output Load Rating (VA) Pilot Duty: 480VA @ 240VAC; General Purpose: 10A @ 240VAC
Restart Delay Range Manual 2 - 300s
Trip Delay Range 4s
Overvoltage Trip Voltage (%) 110%
Overvoltage Reset Voltage (%) 107%
Undervoltage Trip Voltage 90%
Undervoltage Reset Voltage (%) 93%
Termination Type Torque: 7in-lbs; Wire: 12-18AWG
Mounting Method #8 screws
Operating Temperature -20° to 70°C (-4° to 158°F)
Storage Temperature (F/C) -40° to 80°C (-40° to 176°F)
Humidity 10-95% non condensing per IEC 68-2-3
Dimensions 2.93 in H x 5.27 in W x 2.95 in D (74.4 x 133.9 x 74.9 mm)
Weight (lbs/g) 0.98 lb. (15.7 oz. 444.5 g)