Siemens B370H 70A 3P 240V Circuit Breaker, Bolt-On | AmpState

Introducing the Siemens B370H 70A 3P 240V circuit breaker — a bolt-on protection device engineered for reliability in panelboards, load centers, and electrical distribution systems. Built for everyday electrical work, this 3-pole breaker provides solid, consistent interruption across three phases, making it ideal for commercial and light-industrial applications as well as advanced residential setups.

Designed to simplify replacements and stock spares, the B370H helps you keep your bill of materials aligned with the original part number. If you’re refurbishing a panel or performing a service upgrade, this bolt-on breaker ensures a secure fit that technicians trust in demanding environments.

Why the B370H stands out

• Bolt-on mounting enables fast, tool-secure installation with dependable contact pressure that stays tight through vibration and thermal cycling.
• Three poles at 240V deliver coordinated protection for multi-wire branch circuits and 3-phase distribution, with a 70-amp current rating suitable for feeder lines and high-load circuits.
• Original-part compatibility specifically matches Siemens’ B370H specification, making it a straightforward replacement option to preserve BOM integrity.
• Practical spare option for service vehicles and maintenance teams, reducing downtime when a breaker needs replacement during busy schedules.
• Trusted Siemens reliability in panelboards and electrical distribution, backed by the Siemens engineering lineage and compatibility with standard protection schemes.
• AmpState availability ensures you can source this part reliably when you’re stocking or upgrading equipment.

Ideal use cases and practical considerations

Use the Siemens B370H in panelboards, load centers, and distribution panels where three-phase protection is required or where multi-wire circuits benefit from coordinated interrupting. It’s well-suited for replacement projects where the original BOM specifies B370H, helping you maintain consistent parts across the system. When planning a retrofit or service call, pair this breaker with correctly labeled circuits and ensure the amperage rating matches the circuit’s load to stay within electrical code guidelines.

If you’re unsure about fit or compatibility with your existing equipment, AmpState offers support to confirm the correct part number and fit. Message us for guidance and we’ll help verify the match before you purchase.