The Siemens Type BL B120 is a 20A single-pole bolt-on circuit breaker designed for use in Siemens panelboards, making it a reliable choice for professional electricians and contractors working on residential and light commercial electrical distribution projects. Engineered for straightforward installation with a bolt-on stud connection, it provides both manual circuit control and automatic overcurrent protection via thermal magnetic tripping — no fuse replacement required. When a short circuit or overload clears, the circuit is back online with a simple flip of the handle, minimising downtime on the job site. UL 489 listed and built to Siemens' panelboard standards, it's a code-compliant, field-proven solution for branch circuit protection in new construction and retrofit applications.

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