Westinghouse Electric QNBL1020 U Circuit Breaker

The Westinghouse QNBL1020 U is a 20A, 1-pole molded case circuit breaker engineered for overcurrent protection and circuit interruption in residential, commercial, and industrial electrical distributions. It is commonly installed in panelboards, load centers, branch circuit protection systems, and electrical service panels to safeguard individual circuits. This 1P device, part of the Quicklag-B / QNBL series, accepts 120/240 VAC service and offers an interrupt rating of 5kAIC for reliable short‑circuit mitigation. Its plug‑in or bolt‑on mounting provides flexible installation in electrical distribution panels, while the thermal‑magnetic trip ensures fast response to overloads and short circuits in single‑phase applications. Designed as an industrial‑grade molded case breaker, it supports safe power distribution across commercial buildings, industrial facilities, control panels, lighting systems, and other distribution equipment. Common replacements for this unit include Eaton BAB1020, Siemens Q120, and Square D QO120, reflecting its role as a standard 20A, 1‑pole solution for branch circuit protection.