Siemens B325 - 25 A, 240 V, 3-Pole Bolt-On Circuit Breaker | AmpState

The Siemens B325 is a 25A, 240V, 3-pole bolt-on molded case circuit breaker designed to deliver dependable branch circuit overcurrent and short-circuit protection in panelboards and load centers. With a robust bolt-on mounting, it creates a rigid, vibration-resistant bus connection that helps maintain consistent electrical performance even in demanding environments.

Why this breaker stands out

• Bolt-on mounting provides a secure, vibration-resistant connection to the panel bus, reducing the risk of loose connections during operation.
• Thermal-magnetic trip unit delivers stable, repeatable protection for both overloads and short circuits, adapting to changing loads and ambient conditions.
• 3-pole design is ideal for 3-phase circuits, enabling reliable protection in commercial and light industrial applications as well as multi-phase residential setups.
• OEM panel compatibility is designed to fit with matching Siemens OEM load centers and panelboards, supporting straightforward retrofits and upgrades.
• Versatile application suitable for residential, commercial, and light industrial environments, protecting a wide range of branch circuits and equipment.

Ideal use cases

• Retrofit or upgrade projects in existing Siemens panelboards where bolt-on mounting is preferred.
• Protection for three-phase equipment in small to mid-size commercial facilities.
• HVAC controllers, lighting panels, feeders, or other branch circuits requiring reliable overcurrent protection.
• New installations that demand a durable, vibration-resistant connection and predictable trip behavior.

Technical specifications at a glance

• Manufacturer: Siemens
• Part Number: B325
• 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

Practical guidance for installation and longevity

Pair this breaker with compatible Siemens panelboards for a seamless fit and coordinated electrical characteristics. When installing, ensure the panel’s bus connection is clean and free of debris to preserve the integrity of the bolt-on contact. Use the panel manufacturer’s guidelines for torque and mounting procedures to maintain a secure, long-lasting connection. This 25A, 240V, 3-pole device is well-suited for environments where reliable 3-phase protection and durable mounting matter most, from renovation projects to new commercial builds.