The Siemens HGB3B125B is a three-pole circuit breaker rated for 125 amps at 480/277 volts. It installs with bolt-on connections in compatible Siemens panelboards and switchboards to protect three-phase circuits from overload and short-circuit conditions. Electricians commonly use this model in commercial and light industrial distribution systems where UL-listed 3-pole protection at these voltage and current ratings is required.
