The Eaton HGHB1020 is a 1-pole circuit breaker rated for 20 amps at 277 volts. It is part of the Cutler-Hammer HGHB family, identified by the HGHB1020 designation as a single-pole, 277V device. This 20A, 277V breaker is designed to protect a branch circuit powered by a 277-volt supply.
