455480R - 455 Series

Series: 455 Questions? Contact Littelfuse Support
Littelfuse Voltage Monitoring Relays
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The 455 Series are 3-phase voltage monitors that combine load and line side monitoring to offer complete protection. Monitoring the load side will alert the user of contactor failure or impending contactor failure. Line side monitoring will also protect the motor from damaging fault conditions that may be present prior to the motor starting. With other line/load side monitors, the motor must be started before a voltage fault is detected. With the 455, your motor is fully protected at all times.

The 455 Series are 3-phase, dual range voltage monitors that protect 190-480VAC, 50*/60Hz motors, regardless of their size. It automatically selects between the 200V and 400V range when the user selects the nominal voltage setpoint. Other adjustments include a 2-30 second trip delay, a 2-300 second restart delay (and manual restart) and a voltage unbalance trip point of 2-8%. The voltage monitor’s circuitry is powered through the line side connections, so there is no need for separate control power, making it easy to install.

Equipped with an infrared LED, the 455 Sereies can communicate to the optional hand-held diagnostic tool, Informer-MS to obtain valuable information such as real-time voltage, voltage unbalance on both line and load sides, motor run hours, last 20 faults, last 32 motor starts, high and low voltage trip points, voltage unbalance trip

Property (Mouseover for details) Value
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
Restart Delay Range Manual 2 - 300s adjustable
Repeat Accuracy (%) ±0.1%
Trip Delay Range Over Under and Unbalanced Voltage: 2 - 30s adjustable; Single-phasing faults (>25%UB): 2s fixed
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)
Weight (lbs/g) 1.1 lbs. (17.6 oz. 499.0 g)