Siemens LGB3B045 3-Pole Bolt-On Circuit Breaker

Siemens LGB3B045B is a 3-pole bolt-on molded-case circuit breaker for panelboard installations, delivering 45 A of current with thermal-magnetic trip protection. It is rated for 480Y/277 V AC service with a 65 kAIC interrupting rating, making it suitable for demanding commercial/industrial feeders, while it also supports up to 600Y/347 V with a 14 kAIC rating for other supply configurations. This bolt-on unit uses a pull-out design for secure mounting in Siemens low‑voltage panels and provides common-trip operation across all three poles. The LGB family is a low-voltage panelboard mounting solution, and the LGB3B045B variant is intended for three‑phase circuits where reliable overload and short-circuit protection is required. When selecting this breaker, verify panel compatibility, bus bar arrangement, and lug or termination options in your Siemens catalog, as mounting and accessory configurations can vary by panel model.