The 355 series is a three-phase voltage monitor with adjustable trip and restart delay, adjustable voltage unbalance, and multiple diagnostic lights. It is ideal for heavy-duty applications that need both protection and simple user-friendly diagnostics. Suitable applications include pump panels, commercial HVAC, oil rigs, and many more. The 355 series uses microcontroller technology to monitor incoming voltage and de-energize its output relay if power problems exist. It can protect motors from damage caused by single-phasing, high- and low-voltage, phase reversal, and voltage unbalance. These relays have four diagnostic LEDs that clearly show overvoltage, undervoltage, voltage unbalance, reverse-phase, and normal conditions. The adjustable trip and restart settings prevent nuisance tripping due to rapidly fluctuating power line conditions and allow staggered start-up of multiple motors after a fault to prevent a low-voltage condition. Series 355 models include the 355-200, which is equipped with a heavy-duty 10 A general purpose SPDT relay. The 355- 400 and 355-600 models are equipped with a 470 VA @ 600 V ac pilot duty SPDT relay. A high-voltage (600 V) DPDT relay output option is available with the 400 V model. Applications • Pump panels• Commercial HVAC• Oil rigs• Heavy-duty applications that need both protection and simple user-friendly diagnostics *Note: 50 Hz will increase all delay times by 20%. Specifications Input Characteristics Line Voltage (Specify voltage range) 355200 190–240 V ac355400 380–480 V ac355600 475–600 V ac Frequency 50*/60 Hz 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% Trip Delay Time Low & High Voltage and Unbalance 2–30 seconds adjustableSingle-phasing Faults (>25% UB) 2 seconds Restart Delay Time After a Fault or Power Loss Manual, 2–300 seconds adjustable Output Characteristics Output Contact Rating SPDT (355200) Pilot Duty 480 VA at 240 V acGeneral Purpose 10 A SPDT (355400, 355600) Pilot Duty 470 VA @ 600 V ac DPDT (-5 Option) Pilot Duty 470 VA @ 600 V ac General Characteristics Temperature Range Operating -40° to 70 °C (-40° to 158 °F)Storage -40° to 80 °C (-40° to 176 °F) Repeat Accuracy Fixed Conditions ±0.1%Maximum Input Power 6 W Terminal Torque 7 in.-lbs. Wire Size 12–18 AWG Transient Protection (Internal) 2500 V for 10 ms Dimensions H 74.42 mm (2.93”)W 133.86 mm (5.27”)D 74.93 mm (2.95”) Weight 0.94 lb. (15.04 oz., 426.38 g) Mounting Method #8 screws Special Options Option 5 - DPDT Relay Certification & Compliance UL UL 508 (File #E68520)
