Littelfuse 455 Voltage Monitor Product 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 190-480VAC, 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
Littelfuse 455 Voltage Monitor Typical Applications
- Fans
- Compressors
- HVAC
- Heat Pumps
- Well Pumps
- Sump Pumps
- Small Conveyor Motors
- Oil Rigs
Littelfuse 455 Voltage Monitor Features
- Load Side Monitoring of Contactor: Protects Motor from Contactor Failure or Worn Contacts
- Monitors Contactor or Starter: Prevents Rapid Cycling
- Infrared LED Capable: Increases Personnel Safety Line of Sight Monitoring using Optional Informer-MS
Littelfuse 455 Voltage Monitor Specifications
3-Phase Line Voltage . . . . . . . . . . . . 190 to 480 VAC
Frequency
. . . . . . . . . . . . . . . . . . . . . 50*/60Hz
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% adjustable
- Reset . . . . . . . . . . . . . . . . . . . . . . . . . Trip setting minus 1%
Trip Delay Time
- Low & High Voltage and Unbalance. . . . . . . . . . . . 2-30 seconds adjustable
- Single-Phasing Faults (>25% UB) . . . . . . . 2 seconds
Restart Delay Time
- After a Fault . . . . . . . . . . . . . . . . . Manual, 2-300 seconds adj.
- After a Complete Power Loss . . . . . . . Manual, 2-300 seconds adj.
- After a Motor Shut-Down . . . . . . . Manual, 2-300 seconds adj.
Output Contact Rating
- SPDT . . . . . . . . . . . . . . . . . . . . . . . . 480VA @ 240VAC Pilot Duty
- . . . . . . . . . . . . . . . . . . . . . . . . . . . . or 10A General Purpose
- High Voltage Relay (-480R) . . . . . . . . . .470VA @ 600VAC Pilot Duty
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%
Power Consumption
. . . . . . . . . . . . . 6 Watts (Max.)
Terminal Torque . . . . . . 7 in.-lbs.
Wire Size . . . . . . 12-18AWG
Transient Protection (Internal). . . . . . IEC 61000-4-5;1995 ±6kV
Safety Marks
- UL . . . . . . . . . . . . . . . . . UL508 (File #E68520)
- CSA . . . . . . . . . . . . . . C22.2 No. 14 (File #46510)
- CE . . . . . . . . . . . . . . . . . . . . . . . IEC 60947-6-2
Weight . . . . . . . . . . . . . . . . . . . . . . . . 17.6 oz.(1.1lbs)
Mounting Method
. . . . . . . . . . . #8 screws
*Note: 50Hz will increase all delay timers by 20%.
WARNING:
Cancer and Reproductive Harm - www.P65Warnings.ca.gov
SymCom Warranty
SymCom Limited Warranty
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