Siemens B320 - 20 A, 240 V, 3-Pole Bolt-On Circuit Breaker | AmpState

Meet the Siemens B320 — a 20A, 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. Built for residential, commercial, and light industrial environments, this device combines robust construction with precise protection where it matters most.

Key advantages that keep your panels safe

• Secure bolt-on mounting provides a rigid, vibration-resistant bus connection, reducing the risk of loose connections in busy electrical panels.
• Thermal-magnetic trip unit delivers stable, repeatable protection by balancing fast magnetic response for short circuits with thermal delay for sustained overloads.
• 3-pole, 20A, 240V design is ideal for 240V distribution and 3-phase or multi-wire branch circuits common in modern panels.
• OEM compatibility works seamlessly with matching Siemens OEM load centers and panelboards, ensuring reliable operation and easier replacement.

Why this 3-pole bolt-on breaker matters in your setup

• In residential settings, it supports critical 240V circuits and multi-wire branch configurations with solid protection against nuisance trips caused by vibrations or loose bus connections.
• In commercial environments, it helps safeguard lighting, outlets, small equipment, and control circuits that share a common bus, reducing downtime and maintenance costs.
• In light industrial applications, its bolt-on design stands up to steady operation, providing consistent performance in panels that experience regular activity and vibration.

Technical specifications at a glance

• Manufacturer: Siemens
• Part Number: B320
• Type: Thermal-magnetic molded case circuit breaker
• Amperage Rating: 20A
• Voltage Rating: 240V
• Number of Poles: 3
• Mounting Style: Bolt-on
• Application: Branch circuit overcurrent and short-circuit protection

Who should consider the Siemens B320?

• Homeowners upgrading or extending 240V circuits in main or subpanels who require reliable 3-pole protection.
• Electrical contractors designing commercial panelboards or light industrial layouts that demand robust, vibration-resistant breakers.
• Maintenance teams seeking compatible, easy-to-replace components within Siemens OEM ecosystems.

Practical tips for best results

Pair the B320 with the appropriate Siemens OEM panel or loadcenter to maintain optimal protection performance. Ensure circuits calling for 240V are distributed across the three poles as designed, and verify that the panel’s bus connections and mounting surface are clean and free from debris to maximize the benefits of the bolt-on interface and the thermal-magnetic trip system.