Utility Relay Company is a leading manufacturer of microcontroller based, true RMS solid state trip units for AC and DC power circuit breakers. Since URC started in 1995, our total energy has been focused on one thing, low voltage protection. More specifically, to develop and manufacture retrofit protection products for the low voltage breaker retrofit market. Our company philosophy is simple; produce high quality, easy to use and install products and follow it up with the greatest customer service possible. Over the years both the ZERO-Hertz(r) and AC-PRO(r) trip units have become familiar names in the industry. URC is proud to be your source of retrofit protection products for the low voltage breaker retrofit market.