Siemens B240H - 40 A, 240 V, 2-Pole Bolt-On Circuit Breaker | AmpState

The Siemens B240H is a 40A, 240V, 2-pole bolt-on molded case circuit breaker designed to deliver reliable branch circuit protection for panelboards and load centers. Built for durability, its bolt-on mounting creates a rigid, vibration-resistant bus connection that stays secure even in demanding electrical environments.

• Secure bolt-on mounting: a solid, vibration-resistant connection that maintains stability through constant use and vibration.
• Thermal-magnetic trip: provides stable, repeatable protection by reacting to both overloads and short circuits, reducing nuisance trips during routine load fluctuations.
• 2-pole, 40A, 240V configuration: ideal for protecting essential branch circuits in residential panels, commercial spaces, and light industrial applications.
• OEM compatibility: designed to work with matching Siemens load centers and panelboards, simplifying stocking and replacement while ensuring a proper fit.
• Versatile application: suitable for a range of environments—from home subpanels to small commercial installations—where dependable overcurrent protection is a must.

Why this Siemens breaker stands out

Unlike generic breakers, the B240H is engineered to align with Siemens panelboard architectures, delivering a seamless integration that minimizes troubleshooting and downtime. The combination of a robust bolt-on mount and a precise thermal-magnetic trip unit means you get predictable performance across seasons and load conditions, helping protect wiring, devices, and occupants alike.

Technical snapshot

Part number: B240H

Type: Thermal-magnetic molded case circuit breaker

Poles: 2

Amperage rating: 40A

Voltage rating: 240V

Mounting style: Bolt-on

Applications: Branch circuit overcurrent and short-circuit protection in panelboards and load centers

Ideal for

• Electrical contractors upgrading or maintaining Siemens panelboards in homes, small offices, and light industrial facilities
• Facility managers seeking reliable, long-lasting protection for critical circuits
• DIY enthusiasts working within compatible Siemens systems who need a precise fit and easy swap-in replacement

Practical tips for use

• Ensure the breaker is installed in a Siemens-matched panelboard or load center to preserve warranty and protection integrity.
• Confirm 40A circuit design and conductor sizing align with your load requirements to avoid nuisance trips or wiring overloads.
• Follow the panelboard manufacturer’s installation instructions for mounting torque and clearance, and verify all connections are secure after installation.