Siemens BQ3B025 - 25 A, 240 V, 3-Pole Bolt-On Circuit Breaker | AmpState

Siemens BQ3B025 is a 25A, 240V, 3-pole bolt-on molded case circuit breaker engineered to deliver dependable branch-circuit protection in panelboards and load centers. The secure bolt-on mounting creates a rigid, vibration-resistant bus connection—making it a reliable choice for panels in commercial spaces, workshops, and light industrial environments where steady performance matters.

A thermal-magnetic trip unit provides stable, repeatable protection by responding to both overloads and short-circuit events. This means fewer nuisance trips and more consistent protection for conductors and connected equipment, even under fluctuating loads or mechanical vibration.

Designed to integrate with matching Siemens OEM load centers and panelboards, the BQ3B025 ensures clean electrical characteristics and straightforward installation. Its 3-pole, 25A, 240V configuration is well-suited for three-phase systems common in small-to-medium commercial and light industrial projects, as well as multi-wire residential circuits that require robust protection at the panel level.

• Bolt-on mounting for a secure, vibration-resistant connection in demanding environments
• Thermal-magnetic trip unit delivering reliable overcurrent and short-circuit protection
• 25A, 240V, 3-pole design ideal for three-phase panels and multi-wire circuits
• Compatibility with Siemens OEM load centers and panelboards for seamless replacements
• Specifically suited for residential, commercial, and light industrial applications requiring durable branch-circuit protection

Ideal use cases

• Upgrading or replacing breakers in existing Siemens panelboards where a secure, vibration-resistant connection is needed
• Subpanel installations in small offices, retail spaces, or workshops that require dependable three-phase protection
• New construction or remodels where a robust, plug-compatible bolt-on breaker is preferred for long-term reliability

Why this breaker stands out

Beyond basic specs, the BQ3B025 combines Siemens engineering excellence with a mounting system designed to withstand operational vibration, reducing the chance of intermittent faults. The thermal-magnetic protection curve provides predictable performance across a range of fault currents, helping ensure the safety of wiring and devices connected downstream. When paired with compatible load centers, it simplifies commissioning and maintenance, giving electricians a dependable solution for demanding electrical environments.

Technical specifications

• Manufacturer: Siemens
• Part Number: BQ3B025
• Type: Thermal-magnetic molded case circuit breaker
• Amperage Rating: 25A
• Voltage Rating: 240V
• Number of Poles: 3
• Mounting Style: Bolt-on
• Application: Branch circuit overcurrent and short-circuit protection