

The Universal Motor Starting Relay UMSR-50B-LF is a high-performance part that supports motors up to 10 HP. With a voltage range of 110-277V, this relay replaces all standard potential relays on the market, including Supco APR5 and SUPR, ensuring precision starts with patented differential voltage sensing technology. It can be used in A/C, commercial refrigeration, heat pump, and single-phase motor applications. The non-positional mounting configuration and no user-adjustments required make installation a breeze.