201A-9 - 201A Series

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Littelfuse Voltage Monitoring Relays
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The 201A is a 3-phase, auto-ranging, dual-range voltage monitor that protects 190-480VAC, 50/60Hz motors regardless of size. The product provides a user selectable nominal voltage setpoint and the voltage monitor automatically selects between the 200V and 400V range. The 201A includes advanced single LED diagnostics, where color and different light patterns distinguish between faults and normal conditions.

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 201A’s output relay is deactivated after a specified trip delay. The output relay reactivates after power line conditions return to acceptable levels.

Property (Mouseover for details) Value
Input Voltage (V) 190 to 480VAC
Maximum Input Power 5W
Input AC Line Frequency (Hz) 50/60Hz
Output Form SPDT
Output Load Rating (VA) Pilot Duty: 480VA @ 240VAC; General Purpose: 10A @ 240VAC
Restart Delay Range 2s
Trip Delay Range Under/Over Voltage Fault: 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%
Type of Detection High Voltage Detection
Termination Type Torque: 12in-lbs; Wire: Stranded or solid 12-22AWG
Mounting Method DIN rail or surface mount (plug-in to OT08-PC socket)
Operating Temperature -20° to 70°C (-4° to 158°F)
Humidity 10-95% 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) 0.7 lb. (11.2 oz. 317.5 g)