Siemens QP3B050 3-Pole Molded Case Circuit Breaker

Siemens QP3B050 is a three-pole molded‑case circuit breaker (MCCB) rated for 50 A at 240 V AC, designed with a thermal‑magnetic trip to provide overload and short‑circuit protection for three‑phase circuits. As a member of the Siemens QP series, it is intended for use in industrial and commercial electrical distributions requiring reliable protection of three‑phase loads. The 50 A rating supports mid‑range branch protection for motors and other three‑phase equipment, while the 240 VAC rating aligns with typical three‑phase systems in many facilities. The thermal‑magnetic trip mechanism combines long‑time thermal protection with instantaneous magnetic protection for fast fault clearing, helping minimize equipment damage and downtime. The QP3B050 is a 3‑pole configuration with a 50‑amp rating and 240‑volt maximum, designed for use in compatible Siemens panels and distribution equipment that accept QP MCCBs.