Siemens B315HH - 15 A, 240 V, 3-Pole Bolt-On Circuit Breaker | AmpState

Meet the Siemens B315HH 15A, 240V, 3-pole bolt-on circuit breaker — a robust molded-case solution built to deliver reliable branch-circuit protection for panelboards and load centers. Designed for residential, commercial, and light-industrial environments, this breaker combines precise protection with durable construction to keep electrical systems safe and available.

Why this breaker stands out

• Secure bolt-on mounting. The bolt-on design creates a rigid, vibration-resistant connection to the bus, helping prevent loose connections that can compromise protection in demanding environments.
• Thermal-magnetic trip unit. A combined thermal and magnetic sensing mechanism delivers stable, repeatable protection — fast enough to interrupt short-circuit events while avoiding nuisance tripping on normal loads.
• Three-pole protection for all conductors. The 3-pole configuration ensures simultaneous disconnection of all live lines, enhancing safety and meeting common multi-wire and 3-phase protection requirements.
• OEM panel compatibility. Engineered to work with matching Siemens load centers and panelboards, simplifying replacement and ensuring coordinated protection across your system.
• Versatile application. Suitable for a wide range of circuits, including HVAC, pumps, machinery, and other 240V loads, in both new installations and panel upgrades.

Technical snapshot

• Manufacturer: Siemens
• Part Number: B315HH
• Type: Thermal-magnetic molded case circuit breaker
• Amperage Rating: 15A
• Voltage Rating: 240V
• Number of Poles: 3
• Mounting Style: Bolt-on
• Application: Branch circuit overcurrent and short-circuit protection

Ideal use cases

• Upgrading or replacing a 3-pole 240V breaker in residential or light commercial panelboards to restore reliable protection for multi-wire circuits.
• Protecting 240V loads such as motors, compressors, heat pumps, and other equipment in small to mid-size commercial settings.
• Installing in Siemens-compatible load centers where bolt-on mounting and OEM panel match are essential for a streamlined retrofit.
• Situations requiring guaranteed tripping of all three conductors simultaneously for enhanced safety and code compliance.

Installation and compatibility tips

• Use in panelboards and load centers that specify Siemens bolt-on molded case breakers to ensure proper fit and protection coordination.
• Choose this 3-pole breaker when you need coordinated protection across all live lines in 240V circuits and want a secure, vibration-resistant connection.
• Confirm the circuit load before installation to ensure a clean trip profile and avoid nuisance trips due to minor overloads during startup of 240V equipment.

What problems this solves

• Prevents partial or loose connections that can lead to overheating and intermittent protection failures in vibration-prone installations.
• Delivers dependable fault protection for 3-wire, 240V systems, reducing risk during short circuits and overload events.
• Maintains system reliability by aligning with Siemens OEM panels, simplifying replacement and maintenance workflows.