Littelfuse 460-200-SP Single-Phase Voltage MonitorLittelfuse 460 200 SP Voltage Monitor Product Description The 460 200 SP is used on 190240 V ac, 50* 60 Hz single phase motors to protect them from damaging high and low voltage conditions. An adjustment knob allows the user to set a 1500 second restart delay. The variable restart delay is also a power up delay and can be utilized to stagger start motors on the same system. A unique microcontroller based, voltage sensing circuit constantly monitors