Siemens B340H - 40 A, 240 V, 3-Pole Bolt-On Circuit Breaker | AmpState

The Siemens B340H is a robust 3-pole bolt-on molded case circuit breaker designed to deliver dependable branch circuit protection for your electrical panels. With a 40A rating and 240V operation, it’s built to handle standard three‑phase loads while maintaining precise, repeatable protection in demanding environments.

Why the Siemens B340H stands out

• Secure bolt-on mounting for a rigid, vibration‑resistant bus connection that stays reliable even in equipment that experiences movement or vibration.
• Thermal-magnetic trip unit combines thermal overload protection with magnetic trip for instantaneous response to short circuits, delivering stable protection without nuisance tripping.
• OEM‑class compatibility designed to work seamlessly with matching Siemens load centers and panelboards, ensuring consistent trip characteristics and easy replacements.
• Versatile for multiple sectors ideal for residential, commercial, and light industrial panelboards and loadcenters where dependable overcurrent protection is essential.
• Durable, molded‑case construction built to endure ongoing electrical demands while providing predictable performance over the life of the installation.

Technical snapshot

• Manufacturer: Siemens
• Part Number: B340H
• Type: Thermal-magnetic molded case circuit breaker
• Amperage rating: 40A
• Voltage rating: 240V
• Number of poles: 3
• Mounting style: Bolt-on
• Applications: Branch circuit overcurrent and short-circuit protection in panelboards and loadcenters

Ideal use scenarios

• Three‑phase residential or light commercial panels where 240V equipment and motors require reliable protection.
• Panels in environments with moderate vibration or movement, where bolt‑on mounting helps maintain a solid bus connection.
• Retrofit or upgrade projects needing a compatible, OEM‑matched breaker to preserve established electrical characteristics.

Practical tips and considerations

• Pair the B340H with Siemens load centers and panelboards to ensure consistent trip curves and optimum protection.
• Follow manufacturer torque specifications for the bolt‑on connections to maintain the integrity of the bus connection and prevent loosening over time.
• Use the thermal element for predictable long‑term protection and rely on the magnetic trip for immediate response during short‑circuit events, reducing damage to wiring and devices.
• Consider the 40A rating in your design to accommodate typical motor starts and other 3‑phase loads while preserving upstream protection coordination.

Choose the Siemens B340H 40A 240V 3‑pole bolt‑on circuit breaker for dependable, industry‑standard protection that integrates cleanly into panelboards and loadcenters you already rely on. It’s a purpose‑built solution for stable, code‑compliant overcurrent protection across residential, commercial, and light industrial applications.