Siemens BQ3B04000S01 - 40 A, 240 V, 3-Pole Bolt-On Circuit Breaker | AmpState

Siemens BQ3B04000S01 is a 40A, 240V, 3-pole bolt-on molded case circuit breaker designed for dependable branch circuit overcurrent and short-circuit protection in panelboards and load centers. Built to endure in demanding environments, it pairs rugged mounting with precise protective action to keep critical electrical systems safe and available.

• Secure bolt-on mounting provides a rigid, vibration-resistant bus connection that maintains consistent electrical contact even in busy panels or equipment rooms.
• Thermal-magnetic trip unit delivers stable, repeatable protection performance by automatically responding to both overcurrent and short-circuit conditions with coordinated sensitivity.
• OEM-compatible design is engineered to fit matching Siemens load centers and panelboards, simplifying replacements and minimizing custom wiring work.
• Versatile application suitable for residential, commercial, and light industrial deployments where reliable protection is essential for downstream circuits and equipment.

Why this matters for your electrical protection

In any distribution panel, protection isn’t just about stopping a fault—it’s about preventing nuisance trips, reducing downtime, and extending the life of wiring and devices. The BQ3B04000S01’s bolt-on strategy reduces connection resistance over time, while its thermal-magnetic mechanism ensures the right level of protection kicks in promptly when faults occur. That means fewer unexpected outages and faster recovery for critical loads.

Ideal use scenarios

• Upgrading or replacing aging breakers in Siemens panelboards and load centers where 240V, 40A protection is required.
• Protecting multi-wire branch circuits and equipment with consistent trip characteristics across commercial or light industrial spaces.
• Installing in new or retrofit projects where a robust, bolt-on MCCB solution minimizes vibration-related concerns in mechanical or electrical spaces.

Technical specifications at a glance

• Manufacturer: Siemens
• Part Number: BQ3B04000S01
• Type: Thermal-magnetic molded case circuit breaker (MCCB)
• Amperage Rating: 40 A
• Voltage Rating: 240 V
• Number of Poles: 3
• Mounting Style: Bolt-on
• Application: Branch circuit overcurrent and short-circuit protection