202-575-RP - 202/202-RP Series

Littelfuse Voltage Monitoring Relays
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The 202 series is a 3-phase, auto-ranging, dual-range voltage monitor that protects 190-600VAC, 50/60Hz motors regardless of size. The 202-RP monitors the phase rotation of 3-phase systems and trips on reverse phase only. Critical applications include fan motors, scroll compressors, grinders, conveyor systems, elevators and escalators. Both products provide a user selectable nominal voltage setpoint and some models automatically select between the 200V and 400V range.

This unique microcontroller-based voltage and phase-sensing device constantly monitors the 3-phase voltages to detect harmful power line conditions. When a harmful condition is detected, the 202 series’s output relay is deactivated after a specified trip delay. The output relay reactivates after power line conditions return to acceptable levels. The 202 series includes advanced single LED diagnostics. Five different light patterns distinguish between faults and normal conditions. The 202-RP monitors the phase rotation of 3-phase systems and trips on reverse phase only. Critical applications include fan motors, scroll compressors, grinders, conveyor systems, elevators and escalators. The status light turns green and the relay is activated when rotation is correct.

Property (Mouseover for details) Value
Input Voltage (V) 475 to 600VAC
Input Tolerance (%) ±10%
Maximum Input Power 5W
Input AC Line Frequency (Hz) 50/60Hz (50Hz will increase all delay timers by 20%.)
Input Phase Sequence ABC
Output Form SPDT
Output Load Rating (VA) Pilot Duty: 480VA @ 240VAC; General Purpose: 10A @ 240VAC
Restart Delay Range Manual 2 - 300s adjustable
Repeat Accuracy (%) ±0.5%
Trip Delay Range Over and Under Voltage: 4s; Unbalance and Phasing Faults: 2s
Trip Point Accuracy (%) ±1%
Overvoltage Trip Voltage (%) 110%
Overvoltage Reset Voltage (%) 107%
Undervoltage Trip Voltage 90%
Undervoltage Reset Voltage (%) 93%
Voltage Unbalance Trip Point (%) 6%
Voltage Unbalance Reset (%) 4.50%
Dielectric Breakdown 1.960 Vrms min
Termination Type 0.25 in male quick connect
Mounting Method 1/4 in socket head cap screw (customer supplied)
Operating Temperature -40° to 70°C (-40° to 158°F)
Humidity 95% non-condensing
Dimensions 2.50 in H x 2.50 in W x 1.40 in D (63.5 x 63.5 x 35.6 mm)
Weight (lbs/g) 0.5 lb. (8.0 oz. 226.8 g)