Siemens HGB2B040B - 40 A, 600 V, 2-Pole Bolt-On Circuit Breaker | AmpState

Engineered by Siemens, the HGB2B040B 40A, 600V, 2-pole bolt-on molded case circuit breaker delivers reliable protection for branch circuits in panelboards and loadcenters. Its robust design and precise thermal-magnetic trip technology help minimize nuisance trips while keeping electrical systems safe and compliant.

• Secure bolt-on mounting provides a rigid, vibration-resistant bus connection that stays solid through steady operation and routine panel maintenance.
• Thermal-magnetic trip unit delivers stable, repeatable protection—responding accurately to sustained overcurrents and short-circuit events without unnecessary tripping.
• 2-pole, 40A, 600V rating combines compact, efficient protection for both hot legs in multiwire circuits, suitable for a wide range of panel configurations.
• Panelboard and loadcenter compatibility designed to pair with matching OEM environments for straightforward replacement and fewer installation surprises.
• Versatile application ideal for residential, commercial, and light industrial electrical systems that require reliable branch circuit protection.

Why choose the Siemens HGB2B040B

Unlike generic breakers, the HGB2B040B is engineered to integrate seamlessly with Siemens panelboards and OEM loadcenters, ensuring consistent performance across your electrical infrastructure. The combination of bolt-on robustness and a precise thermal-magnetic trip creates a dependable line of defense against overcurrent and short circuits, protecting wiring, devices, and occupants.

Ideal use cases

• New installations in residential panels where a secure, long-lasting connection is essential
• Retrofits in commercial or light industrial panels needing reliable 2-pole protection for multiwire circuits
• Replacement for aging or incompatible breakers in compatible Siemens systems
• Loadcenters and panelboards in environments with vibration or moderate mechanical stress

Technical specifications

• Manufacturer: Siemens
• Part Number: HGB2B040B
• Type: Thermal-magnetic molded case circuit breaker
• Amperage Rating: 40A
• Voltage Rating: 600V
• Number of Poles: 2
• Mounting Style: Bolt-on
• Application: Branch circuit overcurrent and short-circuit protection

Installation and practical considerations

Follow Siemens installation guidelines and the panelboard manufacturer’s instructions to ensure proper torque and bus connections. The bolt-on design helps achieve a solid, vibration-resistant bond, which is especially valuable in equipment rooms, basements, or other locations prone to movement. For best results, verify compatibility with your existing OEM loadcenter, and replace any related accessories only with Siemens-approved components.