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Littelfuse Inc.
201A Series
Littelfuse Inc.
201A-AU Series
 
Littelfuse Inc.
202 Series
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201A-AU Series

3-Phase Voltage/Phase Monitor

Littelfuse Inc.

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.

Specifications
  • Circuit:SPDT (1 Form C)
  • Contact Rating @ Voltage:10A @ 240VAC
  • Delay Time:Fixed, 1 Sec; 1 Sec ~ 30 Sec
  • Mounting Type:Socketable
  • Operating Temperature:-40°C ~ 70°C
  • Output Type:Relay
  • Trip Range:190 ~ 480V AC
  • Trip Status:Energized High/Low
  • Type:Voltage Asymmetry, Voltage Sensing AC
  • Voltage - Supply:190 ~ 480VAC
Parts

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201A-AU201A-AU3-PHASE PLUG-IN VOLT MON/ 190- Voltage Asymmetry, Voltage Sensing ACEnergized High/Low190 ~ 480V ACFixed, 1 Sec; 1 Sec ~ 30 SecRoHS
201A-AU-OT201A-AU-OT3-PH PLUG-IN VM/190-480V/ADJ. Voltage Asymmetry, Voltage Sensing ACEnergized High/Low190 ~ 480V ACFixed, 1 Sec; 1 Sec ~ 30 SecRoHS

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