UL/ANSI C37.59 Testing
We Test our trip units and our competitions to the ANSI C37.59 standard. See the detailed results of the testing. learn more
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
The AC-PRO-MP is a UL and CE listed, plug-in, direct replacement trip unit for the STR trip units on the Merlin Gerin & Square D Masterpact MP Circuit Breakers. learn more
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
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.
Utility Relay Company has over 3000 complete conversion retrofit kit designs for existing power circuit breakers from different manufacturers such as:
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.