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Littelfuse 250A Three-Phase Voltage Monitor

Littelfuse 250A Three-Phase Voltage Monitor

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SKU : MSR250A

In Stock Quantity:0

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Brand : Littelfuse/Symcom
$268.69 USD
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Description

Littelfuse 250A Voltage Monitor Product Description

Model 250A is an auto ranging voltage monitor designed to protect 3-phase motors regardless of size. It is used on 190-480VAC, 50 to 60 Hz motors to protect the motors from damage caused by single phasing, low voltage, phase reversal, voltage unbalance, and also high voltage. Added features include the DPDT contacts that are used to perform two functions when parameters are exceeded in addition to the standard adjustable restart delay.

Littelfuse 250A Voltage Monitor Typical Applications

  • Fans
  • Compressors
  • Air Conditioners
  • Heat Pumps
  • Well Pumps
  • Sump Pumps
  • Small Conveyor Motors

Littelfuse 250A Voltage Monitor Features

  • Protects Motor From:
    • Phase Loss (single phasing)
    • Phase Reversal
    • Low Voltage
    • High Voltage
    • Voltage Unbalance
    • Phase Reversal
    • Rapid Cycling
  • Adjustable Restart Delay can be set at Manual Position or Anywhere Between 2-300 Seconds.
  • Universal Range from 190-480 VAC 50/60 Hz Provides the Versatility Needed to Handle Global Applications.
  • Bicolor LED Indicator Light is Green in Normal Conditions and Red During Trip Conditions.
  • Microcontroller Based Provides Better Accuracy and Higher Reliability than Analog Designs.
  • Transient Protected to Meet IEC 1000-4-5:1995 Standards and Stand up Under Tougher Conditions.
  • DPDT Relay Provides Two 10A @ 240 VAC General Purpose Relays to Switch Heavier Loads.
  • Will Detect Single Phase Condition Regardless of Regenerated Voltages.

Specifications

Littelfuse 250A Voltage Monitor Specifications

3-Phase Line Voltage . . . . . . . . . . . . 190 to 480 VAC

Frequency . . . . . . . . . . . . . . . . . . . . . 50*/60Hz Low Voltage

Voltage Unbalance (NEMA)

  • Trip . . . . . . . . . . . . . . . . . . . . . . . . . . 6%
  • Reset . . . . . . . . . . . . . . . . . . . . . . . . . 4.5%

Trip Delay Time

  • Low Voltage, High Voltage . . . . . . . . . . . . . . . . 4 seconds
  • Unbalance, Phasing Faults . . . . . . . 2 seconds

Restart Delay Time

  • After a Fault . . . . . . . . . . . . . . . . . Manual, 2-300 seconds adj
  • After a Complete Power Loss. . . . . . . Manual, 2-300 seconds adj

Output Contact Rating

  • DPDT-2 Form C . . . . . . . . . . . . . . . . . . . . . . . . 480 VA @ 240 VAC Pilot Duty
  • . . . . . . . . . . . . . . . . . . . . . . . . . . . . or 10A @240 VAC General Purpose

Temperature Range . . . . . -40° to 70°C (-40° to 158°F)

Trip & Reset Accuracy . . . . . ±1%

Power Consumption . . . . . . . . . . . . . 5 Watts (Max.)

Relative Humidity . . . . . . Up to 95% non-condensing per IEC 68-2-3

Terminal Torque . . . . . . 7 in.-lbs.

Wire Size . . . . . . 12-18AWG

Transient Protection (internal) . . . . . . IEC 61000-4-5;1995 ±6kV

Approvals

  • UL . . . . . . . . . . . . . . . . . . . . . . . . UL508 (File #E68520)
  • CSA. . . . . . . . . . . . . . . . . . . . . . . . CSA 22.2 No. 14 (File#46510)
  • CE . . . . . . . . . . . . . . . . . . . . . . . . CE IEC 60947-6-2

Weight . . . . . . . . . . . . . . . . . . . . . . . . 16.32 oz.

Mounting Method . . . . . . . . . . . #8 screws

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


WARNING Cancer and Reproductive Harm - www.P65Warnings.ca.gov WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov

Resources

Littelfuse 250A Voltage Monitor Resources

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Littelfuse 250A Product Specifications

Littelfuse 250A Installation Bulletin

Littelfuse 250A Engineering Specifications

Warranty
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