Siemens BQ2B040H - 40 A, 240 V, 2-Pole Bolt-On Circuit Breaker | AmpState

The Siemens BQ2B040H is a 40A, 240V, 2-pole bolt-on molded case circuit breaker engineered to deliver dependable branch circuit protection in panelboards and load centers. Built for resilience and precise protection, this unit is a trusted choice for homes, offices, and light industrial spaces where reliability matters as much as safety.

• Secure bolt-on mounting provides a rigid, vibration-resistant bus connection, helping maintain a solid electrical link even in environments where panels experience movement or vibration.
• Thermal-magnetic trip unit combines a thermal element for overload protection with a magnetic mechanism for fast short-circuit response, delivering stable, repeatable protection performance when faults occur.
• 2-pole design ensures both current-carrying conductors trip together, reducing arc risk and guaranteeing simultaneous disconnection for enhanced safety.
• 40A at 240V rating makes it well-suited for moderate-load branch circuits, including HVAC, lighting, receptacle banks, and small machinery feeds within panelboards.
• Molded-case construction offers durability and better heat management in compact electrical assemblies, supporting longer service life in everyday commercial use.
• OEM-ready compatibility designed to pair with matching Siemens OEM load centers and panelboards, helping to preserve system coordination and listing integrity.
• Versatile applications ideal for residential, commercial, and light industrial environments where dependable protection and easy installation are priorities.

Practical use cases

• Protect a dedicated lighting circuit, outlet bank, or HVAC branch in a home or small business panel—where secure mounting and reliable protection are essential.
• Upgrade or refurbish panelboards in office spaces and light industrial settings that require consistent trip characteristics and robust bus connections.
• Replace aging or incompatible breakers in Siemens-compatible panels to restore predictable protection without modifying existing buswork.

Technical snapshot

• Part number: BQ2B040H
• Type: Thermal-magnetic molded case circuit breaker
• Amperage rating: 40 A
• Voltage rating: 240 V
• Number of poles: 2
• Mounting style: Bolt-on
• Application: Branch circuit overcurrent and short-circuit protection

Choosing the Siemens BQ2B040H means investing in a breaker that not only meets your protection needs but also integrates smoothly with your existing Siemens panel ecosystem. Its combination of secure mounting, precise trip protection, and durable construction translates to fewer service calls, steadier performance, and clearer peace of mind for complex electrical systems.