50 / 60 (50 will increase all delay timers by 20%)
Output Form
SPDT
Output Load Rating (VA)
Pilot Duty: 470 VA @ 600 Vac; General Purpose: 10 A
Restart Delay Range
After a Fault or power loss: Manual; 2 - 300 s adjustable
Repeat Accuracy (%)
±0.1%
Trip Delay Range
Under/Over and Unbalance Voltage: 2 - 30 s adjustable; single-Phase faults (>25%UB): 2 s
Trip Point Accuracy (%)
±1%
Overvoltage Trip Voltage (%)
1.1
Overvoltage Reset Voltage (%)
1.07
Undervoltage Trip Voltage
0.9
Undervoltage Reset Voltage (%)
0.93
Voltage Unbalance Trip Point (%)
2 - 8% adjustable
Voltage Unbalance Reset (%)
Trip setting minus 1%
Termination Type
Torque: 7 in-lbs; Wire Size: 12 - 18 AWG
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 H x 5.27 W x 2.95 D in. (74.4 x 133.9 x 74.9 mm)
Series Features
355 Series - 3-Phase Voltage/Phase Monitor
Series Description:e 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.
Series Applications:Pump panels, Commercial HVAC, Oil rigs, Heavy-duty applications that need both protection and simple user-friendly diagnostics
Proprietary microcontroller-based circuitry: Constantly monitors three-phase voltage to protect against harmful line conditions even before the motor is started
Advanced LED indication: Provides diagnostics that can be used for troubleshooting and to determine relay status
Adjustable trip and restart delay settings: Prevents nuisance tripping and allows staggered start-up of multiple motors after a fault to prevent a low-voltage condition
600 V rated relay contacts available on some models: Eliminates the need for a control transformer to step voltage down to 120–240 V for a control circuit
