LSIG circuit breakers are required by code for larger UPS systems, particularly those fed by 480 volts or higher and protected by circuit breakers of 1000 amps or greater. These breakers must have ground fault protection in the service or feeder for the UPS. The adjustability of an LSIG trip unit allows coordination of breakers in the electrical path during a fault event, ensuring that the breaker closest to the fault trips first, before, or instead of upstream protection, thus isolating the fault without shutting down unaffected equipment.