455 Series – Three-Phase Voltage Monitor Relay Series - Littelfuse 455 Voltage Monitoring Relays Provide Superior Protection

Series: 455 Series – Three-Phase Voltage Monitor Relay
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Littelfuse products are not designed for, and shall not be used for, any purpose (including, without limitation, automotive, military, aerospace, medical, life-saving, life-sustaining or nuclear facility applications, devices intended for surgical implant into the body, or any other application in which the failure or lack of desired operation of the product may result in personal injury, death, or property damage) other than those expressly set forth in applicable Littelfuse product documentation. Warranties granted by Littelfuse shall be deemed void for products used for any purpose not expressly set forth in applicable Littelfuse documentation. Littelfuse shall not be liable for any claims or damages arising out of products used in applications not expressly intended by Littelfuse as set forth in applicable Littelfuse documentation. The sale and use of Littelfuse products is subject to Littelfuse Terms and Conditions of Sale, unless otherwise agreed by Littelfuse. "Littelfuse" includes Littelfuse, Inc., and all of its affiliate entities.

The 455 series is a three-phase, dual-range voltage monitor that combines load and line side monitoring for a complete protection solution. Load side monitoring alerts the user to contactor failure or impending contactor failure. Line side monitoring protects the motor from damaging fault conditions that may be present prior to the motor starting. This is unique because with other line/load side monitors, the motor must be started before a voltage fault is detected. With the 455 series, the motor is fully protected at all times.

This voltage monitor protects 190–480 V ac, 50*/60 Hz motors regardless of their size. It automatically selects between the 200 V and 400 V 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 series can communicate with 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 point, restart and trip delay settings, LED status, and more.

*Note: 50 Hz will increase all delay times by 20 %

Features

  • Load side monitoring of contactor
  • Monitors contactor or starter
  • Infrared LED capable

Product Literature

For Technical Questions

Call +1 800-832-3873 or email us at relays@littelfuse.com 

Access specifications, certifications, check availability and order parts below

Catalog #Input
Voltage (V)		Output
Form		Termination TypeMounting MethodDimensionsWeight (lbs/g)Input AC Line Frequency (Hz)Maximum Input PowerOutput Load Rating (VA)Overvoltage Reset Voltage (%)Overvoltage Trip Voltage (%)Repeat Accuracy (%)Restart Delay RangeStorage Temperature (F/C)Trip Delay RangeStockSamplesCompare
455190 - 480 VacSPDTTorque: 7 in-lbs; Wire Size: 12 - 18 AWG#8 screws2.93 H x 5.27 W x 2.95 D in. (74.4 x 133.9 x 74.9 mm)0 Lb50 / 60 (50 will increase all delay timers by 20%)6Pilot Duty: 480 VA @ 240 Vac; General Purpose: 10 A107%110%±0.1%Manual; 2 - 300 s adjustable-40° to 80°C (-40° to 176°F)Under/Over and Unbalance Voltage: 2 - 30 s adjustable; single-Phase faults (>25%UB): 2 sCheckOrder
455480R380 - 480 VacSPDTTorque: 7 in-lbs; Wire Size: 12 - 18 AWG#8 screws2.93 H x 5.27 W x 2.95 D in. (74.4 x 133.9 x 74.9 mm)0 Kg50 / 60 (50 will increase all delay timers by 20%)6Pilot Duty: 470 VA @ 600 Vac107%110%±0.1%Manual; 2 - 300 s adjustable-40° to 80°C (-40° to 176°F)Under/Over and Unbalance Voltage: 2 - 30 s adjustable; single-Phase faults (>25%UB): 2 sCheckOrder
455575475 - 600 VacSPDTTorque: 7 in-lbs; Wire Size: 12 - 18 AWG#8 screws2.93 H x 5.27 W x 2.95 D in. (74.4 x 133.9 x 74.9 mm)0 Kg50 / 60 (50 will increase all delay timers by 20%)6Pilot Duty: 480 VA @ 240 Vac; General Purpose: 10 A107%110%±0.1%Manual; 2 - 300 s adjustable-40° to 80°C (-40° to 176°F)Under/Over and Unbalance Voltage: 2 - 30 s adjustable; single-Phase faults (>25%UB): 2 sCheckOrder
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