Siemens QR23B200NK Molded Case Circuit Breaker

Siemens QR23B200NK is a three-pole, 200 A, 240 V AC molded-case circuit breaker from the QR frame family, engineered for general-purpose overcurrent protection in low-voltage distribution systems, with a footprint that fits Siemens QR panelboards and compatible equipment. It combines thermal and magnetic tripping to respond to overloads and short circuits, delivering a 10 kA interrupt rating (AIC) to reliably clear fault currents and protect feeders, motors, and connected loads in commercial and light-industrial installations. UL 489 and CSA 22.2 recognized, this unit supports field-installable internal accessories for flexible configurations and uses standard line and load terminations in its three-pole configuration. In practice, the QR23B200NK is used as a main or feeder protective device for 200 A, three-phase 240 V circuits, balancing protection, selectivity, and compact QR frame form factor within Siemens' ecosystem of breakers.