Siemens BQD220 Circuit Breaker

Siemens BQD220 is a two-pole molded‑case circuit breaker rated for 20 A in 480Y/277 V AC systems, part of the Siemens ITE BQD/CQD family. The device uses a thermal‑magnetic trip unit to provide reliable overload and short‑circuit protection and is designed to simultaneously disconnect both poles in a 2‑pole configuration. It is UL‑listed and CSA‑approved for use in Siemens‑compatible panelboards and distribution gear in commercial and light‑industrial power systems. The BQD220 supports a DC rating of 125/250 V and an interrupting capacity up to 14 kA (RMS symmetrical) at 480Y/277 V AC, with a 1‑inch‑wide footprint that fits common MCCB spaces. This model is commonly used to protect feeders and branch circuits in 3‑phase, 4‑wire networks that supply equipment, lighting, and general‑purpose loads, offering fast, predictable tripping characteristics and easy interchange with other BQD/CQD devices across Siemens MCCB installations.