Description
The 50R series single-phase voltage monitor has a voltagesensing
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
50R Series.
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.

FEATURES BENEFITS
Proprietary voltage
sensing circuitry
Constant monitoring of single-phase power for
a low voltage condition
Adjustable trip delay
(-3 models) and restart
delay (-2 models) settings
Prevent nuisance tripping due to rapidly
fluctuating power line conditions and allows
staggered start up of multiple motors, after a
fault, to prevent a low voltage condition
High voltage detection
(-9 models)
Trips and resets at a fixed percentage of the
setpoint: trip 110 %, reset 107 %.
600 V rated relay
contacts available
on some models
Eliminates the need for a control transformer
to step voltage down to 120–240 V for a control
circuit