Siemens NSB P120A Miniature Circuit Breaker is a Siemens NSB-series miniature circuit breaker designed to interrupt overcurrent in electrical circuits. The P120A designation identifies a specific model within Siemens' NSB line intended for 120/240 V AC installations. As a 20-amp class device used in standard residential and light commercial panelboards, it provides branch-circuit protection by promptly interrupting fault currents and overloads.
