Siemens B340HH 40A 3P 240V Circuit Breaker, Bolt-On | AmpState

Meet the Siemens B340HH—a 40 A, 3-pole, 240 V bolt-on circuit breaker designed to shield panelboards, load centers, and electrical distribution setups from overloads. Sold by AmpState, it’s the exact direct-part-number solution maintenance teams and panel builders rely on when precision and fast turnarounds matter.

Why choose the Siemens B340HH?

• Direct part-number compatibility: B340HH is the precise component you need for fast, accurate replacements with minimal guesswork.
• Bolt-On mounting: Simplified installation that offers solid mechanical retention and reliable electrical contact, reducing field setup time.
• 3-pole, 240 V configuration: Well-suited for three-phase distribution and commercial/industrial environments requiring consistent protection across all phases.
• Siemens engineering: Built to withstand routine switching, overloads, and the demands of ongoing electrical distribution tasks.
• Ready for inventory and service: Ideal for spare-inventory stock and maintenance workflows where quick interchangeability matters.

Specifications at a glance

• Manufacturer: Siemens
• Part Number: B340HH
• Product Type: Circuit Breaker
• Amperage: 40 A
• Poles: 3
• Voltage: 240 V
• Mounting: Bolt-On
• Applications: Panelboards, load centers, and electrical distribution
• Availability: AmpState

Ideal use cases

• New panel installations and panelboard upgrades in commercial or light industrial settings.
• Replacement in field service where exact part-number matching is essential to maintain code compliance and system integrity.
• Maintenance stock for panel builders and electrical distributors, ensuring rapid fulfillment during outages or upgrades.
• Three-phase distribution scenarios in data centers, manufacturing floors, and similar environments where reliable 3P protection is critical.

What makes it matter for your electrical distribution

The B340HH brings precision and reliability to the forefront of protection. Its bolt-on design minimizes loose connections that can occur with other mounting styles, helping to maintain consistent trip performance and reducing maintenance headaches. With a 40 A rating across three poles and a 240 V operating range, it’s tailored for robust three-phase systems that demand dependable fault isolation and quick restoration after trips. This isn't a generic replacement—it's a targeted, exact-match component that streamlines procurement, reduces installation errors, and keeps critical electrical systems running smoothly.

Compatibility and support

Need help matching a part number or confirming compatibility? Message us and we’ll help you confirm fit.