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The 201A-AU is a 3-phase, auto-ranging, dual-range voltage monitor that protects 190-480VAC, 50/60Hz motors regardless of size. Has user adjustable 1-30 second trip delay, manual or 1-500 second restart delay, and 2-8% voltage unbalance trip point. The product also provides a user selectable nominal voltage setpoint and the voltage monitor automatically selects between the 200V and 400V range. The Model 201A-AU includes advanced single LED diagnostics, where five 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-AU's output relay is deactivated after a specified trip delay. The output relay reactivates after power line conditions return to acceptable levels.

  • Input Voltage (V): 190 to 480VAC Maximum Input Power: 5W Input AC Line Frequency (Hz): 50/60Hz Output Form; Form C Output Load Rating (VA): Pilot Duty: 480VA @ 240VAC B300; General Purpose: 10A @ 240VAC Restart Delay Range: Manual 1 - 500s adjustable Trip Delay Range: Under/Over and Unbalanced Voltage: 1 - 30s adjustable; Single-Phasing Faults: 1s fixed Trip Point Accuracy (%): ±1% Overvoltage Trip Voltage (%): 110% Overvoltage Reset Voltage (%): 107% Undervoltage Trip Voltage: 90% Undervoltage Reset Voltage (%): 93% Voltage Unbalance Trip Point (%): 2-8% adjustable Voltage Unbalance Reset (%): Trip setting minus 1% (5-8% or Trip setting minus 0.5% (2-4%) Mounting Method: DIN rail or surface mount (plug-in to OT08-PC socket) Operating Temperature: -40° to 70°C (-40° to 158°F) Storage Temperature (F/C): -40° to 80°C (-40° to 176°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 (with socket) (44.5 x 60.3 x 104.8 mm)
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Product Type:

Voltage Meter




Form C


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