Siemens BQ3-B020 Miniature Circuit Breaker MCB

Siemens BQ3B020 is a three-pole, 20 A molded‑case circuit breaker (MCB) from the BQ family, rated for 240 V AC and designed to protect three‑phase distribution circuits with a common‑trip mechanism. The bolt‑on mounting style, load-side lug terminals, and a thermal‑magnetic trip system provide both overload and short‑circuit protection, with long‑time and instantaneous trip functions for coordinated protection. With a 10 kA interrupting capacity at 240 V, it safely interrupts fault currents up to 10,000 A, helping safeguard conductors, downstream devices, and equipment. As part of Siemens' legacy BQ line (formerly ITE Gould), this 3P breaker is suited for installation in compatible Siemens panels and is commonly used on motors, pumps, conveyors, and other three‑phase loads where reliable, code‑compliant protection is required. Model designation BQ3B020 indicates 3P, 20A, 240V, 10 kA at 240V, bolt‑on configuration with long‑time and instantaneous trip features.