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Littelfuse 250A-MET Three-Phase Voltage Monitor (Replaces META)

Littelfuse 250A-MET Three-Phase Voltage Monitor (Replaces META)

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SKU : MSR250AMET

In Stock Quantity:0

:
Brand : Littelfuse/Symcom
$246.09 USD
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Description

Littelfuse 250A-MET Voltage Monitor Product Description (Replaces META)

Model 250A-MET is an auto ranging voltage monitor designed to protect 3-phase motors regardless of size. It is used on 190-480VAC, 50/60Hz motors to protect the motors from damage caused by low voltage, voltage unbalance, single phasing and reverse phasing.
A unique microcontroller-based voltage and phase sensing circuit constantly monitors the three phase voltages to detect harmful power line conditions. When a harmful condition is detected, the MotorSaver’s output relay is deactivated after a specified trip delay. The output relay reactivates after power line conditions return to an acceptable level for a specified amount of time (restart delay), unless the unit is in the manual reset mode. The trip delay prevents nuisance tripping due to rapidly fluctuating power line conditions.
The 250A-MET has two Form C relays that operate independently of each other. The left-hand relay will energize when voltage conditions are good and de-energize when a fault condition is detected. The right-hand relay will only energize during a reverse-phase condition.

Littelfuse 250A-MET Voltage Monitor Typical Applications

  • This Unit was Designed for Use in Applications with Fire Control Panels, but may be used Anywhere These Features are Required.

Littelfuse 250A-MET Voltage Monitor Features

  • Protects Motor From:
    • Phase Loss (single phasing)
    • Phase Reversal
    • Low Voltage
    • Voltage Unbalance
  • Universal Range from 95-120 VAC 50/60 Hz Provides the Versatility Needed to Handle Global Applications.
  • Two Form C Relays
  • Microcontroller Based Provides Better Accuracy and Higher Reliability than Analog Designs.

Specifications

Littelfuse 250A-MET 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-MET Voltage Monitor Resources

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Littelfuse 250A-MET Product Specifications

Littelfuse 250A-MET Installation Bulletin

Littelfuse 250A-MET Engineering Specifications

Warranty
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