• AC-PRO, AC Trip Unit

    AC-PRO® Trip Unit

    The AC-PRO Trip unit is a solid state, true RMS sensing overcurrent device for use on 600 volt class circuit breakers. learn more

  • AC-PRO-MP installed an a Masterpact Breaker

    AC-PRO-MP™

    The AC-PRO-MP is a plug-in, direct replacement trip unit for the STR trip units on the Merlin Gerin & Square D Masterpact MP, IEC or UL rated breakers. The AC-PRO-MP does not use rating plugs and is user programmable to replace any versions of the STR 18M, 28D, 38S, 58U. learn more

  • ZERO-Hertz DC Trip Unit

    ZERO-Hertz®

    The ZERO-Hertz trip unit is a solid state overcurrent device for use on one and two pole DC circuit breakers in voltage classes up to 1,000 volts. learn more

  • QUICK-TRIP, Arc Flash Reduction System

    QUICK-TRIP®

    Dramatically reduce arc flash potential for those times when you must work on energized equipment down stream. learn more

 

Trip Units for Low Voltage AC and DC Circuit Breakers

Utility Relay Company is a leading manufacturer of micro controller based, true RMS solid state trip units for AC and DC power circuit breakers. Utility Relay Company’s focus is providing high quality, reliable and versatile trip units for low voltage circuit breakers. We couple the trip units with retrofit kits that are designed with ease of installation and reliability in mind.

The end result is an extensive line of retrofit kits that are easy to install and provide reliable protection

URC trip units retrofit conversion kits replace legacy electromechanical series overload trip devices, thermal magnetic overcurrent releases, and older style electronic trip devices to provide greater accuracy, reliability, functionality and provides life extension of older circuit breakers at a fraction of the cost of a new circuit breaker and without modifying the switchgear.

Utility Relay has over 1100 complete conversion retrofit kit designs for existing power circuit breaker from different manufacturers such as GE, Westinghouse, ITE, ABB, Brown Boveri, Siemens, Allis Chalmers, Federal Pacific, Federal Pioneer (FPE), Sylvania, Merlin Gerin, Unelec, Mears, Square D, Roller Smith, English Electric, Whipp & Bourne and others

Technical Information