Protection Relays Voltage Monitoring Relays 455 SERIES 3-Phase Voltage/Phase Monitor Description 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 190-480 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 2300 second restart delay (and manual restart) and a voltage unbalance Wiring Diagram trip point of 28 %. The voltage monitors circuitry is powered MODEL 455 WITH MOTOR CONTROL USING A 3-POLE CONTACTOR 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 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 point, restart and trip delay settings, LED status and more. Features & Benefits FEATURES BENEFITS Load side monitoring Protects motor from contactor failure or worn of contactor contacts. Monitors contactor Prevents rapid cycling or starter Increases personnel safety line of sight Infrared LED Capable monitoring using optional Informer-MS MODEL 455 WITH MOTOR CONTROL USING A 2-POLE CONTACTOR Accessories Informer-MS A hand-held diagnostic tool designed for use with Littelfuse 455 equipped with an infrared LED transmitter Informer IR Kit-36 36 infrared adapter cable attaches to the face of the unit to provide remote diagnostics without opening the panel. Ordering Information MODEL LINE VOLTAGE DESCRIPTION 455 190-480 V ac Universal line and load side monitor Used in high voltage applications with pilot 455480R 380-480 V ac duty 470 VA 600 V ac For use in Canada or NE USA where 575 V 475-600 V ac 455575 utility power services are common. 2020 Littelfuse, Inc. Rev: 1-A-062716Rev: 2-B-061220 wwwwwwwww.littelfuse.com/455.littelfuse.com/.littelfuse.com/Protection Relays Voltage Monitoring Relays 455 SERIES General Characteristics Specifications Specifications Ambient Temperature Range Frequency 50*/60 Hz Operating -40 to 70C (-40 to 158F) Low Voltage (% of setpoint) Storage -40 to 80C (-40 to 176F) Trip 90 % 1 % Repeat Accuracy Reset 93 % 1 % Fixed Conditions 0.1% High Voltage (% of setpoint) Maximum Input Power 6 W Trip 110 % 1 % Terminal Reset 107 % 1 % Torque 7 in.-lbs. Voltage Unbalance (NEMA) Wire Size 12-18 AWG Trip 28% adjustable Transient Protection Reset Trip setting minus 1 % (Internal) IEC 61000-4-5 1995 6kV Trip Delay Time Safety Marks Low & High Voltage UL UL 508 (File E68520) and Unbalance 230 seconds adjustable CSA C22.2 No. 14 (File 46510) Single-phasing Faults CE IEC 60947-6-2 (>25% UB) 2 seconds fixed Dimensions H 74.4 mm (2.93) W 133.9 mm (5.27) Restart Delay Time D 74.9 mm (2.95) After a Fault Manual, 2300 seconds adj. Weight 1.1 lbs. (17.6 oz., 498.95 g) After a Complete Power Loss Manual, 2300 seconds adj. Mounting Method 8 screws After a Motor Shut-down Manual, 2300 seconds adj. Output Characteristics *Note: 50 Hz will increase all delay times by 20 %. Output Contact Rating (SPDT) Pilot Duty 480 VA 240 V ac General Purpose 10 A High Voltage Relay (-480R) Pilot Duty 470 VA 600 V ac 2020 Littelfuse, Inc. Rev: 1-A-062716Rev: 2-B-061220 wwwwwwwww.littelfuse.com/455.littelfuse.com/.littelfuse.com/