The 201A-AU series is a three-phase, auto-ranging, dual-range voltage monitor that protects 190–480 V ac, 50/60 Hz motors regardless of their size. This monitor provides a user-selectable nominal voltage setpoint and will automatically select between the 200 V and 400 V range. Additional adjustment knobs allow the user to set a 1–30 second trip delay, a manual restart or 1–500 second restart delay, and a 2–8% voltage unbalance trip point. It includes advanced, single LED diagnostics where color and light patterns distinguish between faults and normal conditions. This unique microcontrollerbased voltage and phase-sensing unit constantly monitors the three-phase voltages to detect harmful power line conditions. When a harmful condition is detected, the output relay is deactivated after a specified trip delay. The output relay reactivates after power line conditions return to acceptable levels for a specified restart delay time (or manual reset). Frequency 50/60Hz Functional Characteristics Low Voltage (% of setpoint) Trip 90%±1%Reset 93%±1% High Voltage (% of setpoint) Trip 110% ±1%Reset 107% ±1% Voltage Unbalance (NEMA) Trip 2–8% adjustableReset Trip setting minus 1% (5–8%) Trip setting minus 0.5% (2–4%) Trip Delay Time High, Low and Unbalanced Voltage: 1–30 seconds adjustable Single-Phasing Faults 1 second fixed Restart Delay Time After a Fault: Manual, 1–500 seconds adjustableAfter a Complete Power Loss: Manual, 1–500 seconds adjustable Output Contact Rating (1-Form C) Pilot Duty 480 VA @ 240 V acGeneral Purpose 10 A @ 240 V ac General Characteristics Ambient Temperature Range Operating -40° to 70 °C (-40° to 158 °F)Storage -40° to 80 °C (-40° to 176 °F) Trip & Reset Accuracy ±1% Maximum Input Power 5 W Relative Humidity 10–95%, non-condensing per IEC 68-2-3 Terminal Torque 12 in.-lbs. (for OT08-PC socket) Wire Size 12–22 AWG solid or stranded Transient Protection (Internal) 2500 V for 10 ms Standards Passed Electrostatic Discharge (ESD) IEC 61000-4-2, Level 3, 6 kV contact, 8 kV airRadio Frequency Immunity Radiated 150MHz, 10 V/mFast Transient Burst IEC 61000-4-4, Level 3, 3.5 kV input power & controls Dimensions H 44.5 mm (1.75”)W 60.3 mm (2.38'')D 104.8 mm (4.13”) Enclosure Polycarbonate Weight 0.7 lb. (11.2 oz., 317.51 g) Mounting Method DIN-rail or surface mount (plug in to OT08PC socket) Socket Available OT08PC (UL Rating 600 V) Certification & Compliance UL UL508 (File #E68520)
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