Siemens 5SX21 is a single-pole circuit breaker rated for 277 VAC. This protective device interrupts overcurrent on a single phase to safeguard wiring and connected equipment from faults. As part of the Siemens 5SX family, the 5SX21 is designed for use on 277 VAC circuits found in commercial and industrial installations. Exact current rating and mounting details vary by variant; refer to the official Siemens 5SX21 datasheet for the precise trip current and installation instructions.
