3 Phase SPDT Adjustable Trip & Restart Voltage Monitor (380-480V)

The 355 is a 3-phase voltage monitor with adjustable trip and restart delay, adjustable voltage unbalance and multiple diagnostic lights. It is perfect for heavy-duty applications that need both protection and simple user-friendly diagnostics. Applications include pump panels, commercial HVAC, oil rigs and others. The 355 uses microcontroller technology to monitor incoming voltage and de-energize its output relay if power problems exist. The 355 can protect motors from damage caused by single-phasing, high and low voltage, phase reversal and voltage unbalance. It has four diagnostic LEDs that clearly show overvoltage, undervoltage, voltage unbalance, reverse-phase and normal conditions. The 355-400 is equipped with a 470VA @ 600VAC pilot duty SPDT relay. Features: Input Voltage (V): 380 to 480VAC Maximum Input Power: 6W Input AC Line Frequency (Hz): 50/60Hz (50Hz will increase all delay timers by 20%.) Output Form: SPDT Output Load Rating (VA): Pilot Duty: 470VA @ 600VAC; General Purpose: 10A Restart Delay Range: After a Fault or power loss: Manual 2 - 300s adjustable Repeat Accuracy (%): ±0.1% Trip Delay Range: Under/Over Voltage and Unbalance: 2 - 30s adjustable; Single-phasing Faults (>25%UB): 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 (%): 2-8% adjustable Voltage Unbalance Reset (%): Trip setting minus 1% Termination Type: Torque: 7in-lbs; Wire Size: 12-18AWG Mounting Method: #8 screws Operating Temperature: -40° to 70°C (-40° to 158°F) Storage Temperature (F/C): -40° to 80°C (-40° to 176°F) Dimensions: 2.93 in H x 5.27 in W x 2.95 in D (74.4 x 133.9 x 74.9 mm)