Siemens BQ3B030 Three-Phase 240V Circuit Breaker

Siemens BQ3B030 is a three‑pole, 30 A, 240 V molded‑case circuit breaker from the BQ family, designed for general‑purpose overcurrent protection in 3‑phase systems. This common‑trip device provides a 10 kA at 240 V interrupting capacity and uses thermal‑magnetic trip technology with long‑time and instantaneous trip functions, delivering coordinated protection for feeders and motors in commercial or light industrial panels. It is bolt‑on mounted with load‑side terminals and a UL 489 listing, and its footprint measures about 3 in wide by 3 in high by 4 in deep, aligning with standard Siemens MCCB enclosure sizes. The BQ3B030 is intended for 240 V networks and is suitable for protecting 3‑phase circuits in panelboards and switchgear that feed motors and other heavy loads, delivering reliable protection at a 30 A rating.