201-100-DPDT - 201-XXX-DPDT Series

Littelfuse Voltage Monitoring Relays
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The 201-xxx-DPDT is an 11-pin octal base plug-in voltage monitor designed to protect 3-phase motors regardless of size. The 201-100-DPDT is used on 95-120VAC, 50/60Hz motors and the 201-200-DPDT is used on 190-240VAC, 50/60Hz motors to prevent damage caused by incoming voltage problems. The units feature two isolated sets of contacts that are ideal for use with two control circuits with different voltages.

The unique microcontroller-based voltage and phase-sensing circuit constantly monitors the voltages to detect harmful power line conditions. When a harmful condition is detected, the relay’s output relays are deactivated after a specified trip delay. The output relays reactivate 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 unit is also available with a shorter trip delay and faster restart delay. The 201-xxx-DPDT-60mS has a trip delay of 0.5 seconds and a restart delay of 60 milliseconds.

Property (Mouseover for details) Value
Input Voltage (V) 95 to 120VAC
Maximum Input Power 5W
Input AC Line Frequency (Hz) 50/60Hz
Output Form DPDT
Output Load Rating (VA) Pilot Duty: 480VA @ 240VAC; General Purpose: 10A @ 240VAC
Restart Delay Range After a Fault or Complete Power Loss: 2s
Trip Delay Range Low Voltage: 4s; Unbalance Phasing Faults: 2s
Trip Point Accuracy (%) ±1%
Undervoltage Trip Voltage 90%
Undervoltage Reset Voltage (%) 93%
Voltage Unbalance Trip Point (%) 6%
Voltage Unbalance Reset (%) 4.50%
Termination Type Torque: 12 in-lbs; Wire: Stranded or solid 10-22AWG
Mounting Method DIN rail or surface mount (plug-in to OT11-PC socket)
Operating Temperature -40° to 70°C (-40° to 158°F)
Humidity 95% non-condensing per IEC 68-2-3
Dimensions 1.75 in H x 2.38 in W x 4.13 in D (44.5 x 60.3 x 104.8 mm)
Weight (lbs/g) 0.65 lb. (10.4 oz. 294.8 g)