Siemens BQD6240 - 40 A, 600 V, 2-Pole Bolt-On Circuit Breaker | AmpState

Siemens BQD6240, distributed by AmpState, is a 40A, 600V, 2-pole bolt-on molded case circuit breaker designed for reliable branch circuit protection in panelboards and load centers. Built to withstand the demands of residential, commercial, and light industrial installations, this breaker delivers dependable protection where it matters most.

• Bolt-on mounting: Provides a rugged, vibration-resistant connection to the bus, maintaining a tight, long-lasting electrical bond even in harsh environments.
• Thermal-magnetic trip unit: Delivers stable, repeatable protection against overcurrent and short-circuit events with predictable trip behavior.
• 2-pole design: Safeguards two hot legs together, simplifying wiring layouts and enhancing protection for multi-wire branch circuits.
• 40A / 600V rating: Suitable for a wide range of branch circuits in modern panelboards and load centers while providing ample current capacity for typical loads.
• OEM compatibility: Engineered to pair with matching Siemens OEM load centers and panelboards for a guaranteed fit and coherent system performance.
• Versatile application: Ideal for residential service upgrades, commercial electrical rooms, and light industrial feeders needing reliable circuit protection.

Why it matters for your electrical system

This BQD6240 combines a sturdy bolt-on mount with a precise thermal-magnetic trip to reduce nuisance trips and deliver dependable overcurrent and short-circuit protection. The secure mounting minimizes connection resistance fluctuations, while the trip unit responds consistently to faults, helping protect wiring, devices, and downstream equipment.

Practical use cases

• Replacing aging or damaged breakers in existing Siemens panelboards
• Adding a dedicated 2-pole protection point in residential subpanels and small commercial panels
• Feeding branch circuits in light industrial installations where stable protection is critical

Installation and compatibility tips

Choose the Siemens BQD6240 when you need seamless integration with compatible OEM load centers and panelboards. Follow standard electrical codes and the panel’s installation guidelines for mounting and wiring practices. This 2-pole bolt-on MCCB is designed to slot into Siemens system architectures, delivering cohesive performance across related components.

Technical at a glance

• Type: Thermal-magnetic molded case circuit breaker
• Amperage rating: 40A
• Voltage rating: 600V
• Number of poles: 2
• Mounting style: Bolt-on
• Applications: Branch circuit overcurrent and short-circuit protection