This single feed transformer converts standard 120 line voltage to 12 volts to provide the necessary voltage for powering a MonoRail, Kable Lite, Wall MonoRail, or Free Jack low voltage lighting system. It can power lamps totaling up to 75 watts. This transformer is equipped with a fast acting secondary circuit breaker that will safely turn the system off should a short occur. Once the short has been removed the breaker can be reset.