Symcom 201A-AU-OT Phase Failure Relay

Littelfuse® Voltage Monitoring Relay, 3-Phase Auto Ranging Dual Range, Series: 201A-AU, 190 to 480 VAC, 50/60 Hz Frequency, SPDT/(1 Form C) Contact Configuration, 8 Pins, DIN Rail/Surface Mounting, 1 to 30 s Trip Delay, 1-3/4 in H x 2-3/8 in W x 4-1/8 in D Dimensions

Additional Description: LTFS-201A-AU-OT 3-PH PLUG-IN VM/190-480V/ADJ.

Catalog Description: 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.