Siemens B140HH - 40 A, 120 V, 1-Pole Bolt-On Circuit Breaker | AmpState

Meet the Siemens B140HH: a 40A, 120V, 1-pole bolt-on molded case circuit breaker designed to deliver reliable branch circuit overcurrent and short-circuit protection in panelboards and load centers. Built for durability and consistent performance, it’s a smart upgrade for both new installations and panel maintenance projects.

Why it stands out

• Secure bolt-on mounting provides a rigid, vibration-resistant bus connection that stays solid through temperature changes and daily equipment cycling.
• Thermal-magnetic trip unit delivers stable, repeatable protection across varying loads and environmental conditions, reducing nuisance trips and keeping circuits safe.
• OEM-compatible design ensures seamless fit with matching Siemens panelboards and other OEM load centers, simplifying installation and maintenance.
• Versatile for multiple settings suited for residential, commercial, and light industrial applications where dependable protection matters most.

Technical highlights

• Manufacturer: Siemens
• Part Number: B140HH
• Type: Thermal-magnetic molded case circuit breaker
• Amperage Rating: 40 A
• Voltage Rating: 120 V
• Number of Poles: 1
• Mounting Style: Bolt-on
• Application: Branch circuit overcurrent and short-circuit protection

Ideal use cases

Upgrade an aging panel or retrofit a new circuit with confidence. The B140HH excels in spaces where a single-pole, 40A protection device is needed for branch circuits, such as lighting, outlets, or dedicated load circuits in residential units, small commercial spaces, and light industrial setups. Its bolt-on construction makes for a solid, field-ready connection that holds up under vibration and routine service.

Installation and care tips

• Verify compatibility with your panelboard or load center before installation.
• Ensure proper alignment with the bus assembly and secure mounting to maintain electrical integrity.
• Follow OEM torque specifications and installation instructions to avoid damaging the breaker or panel.
• Periodically inspect for signs of overheating or wear in the vicinity of the breaker and surrounding wiring.

Choosing Siemens B140HH over alternatives

While many breakers provide basic overcurrent protection, the B140HH combines a robust bolt-on mounting approach with a precise thermal-magnetic trip mechanism, delivering dependable protection with fewer false trips. Its OEM compatibility means fewer compatibility concerns during panel upgrades, helping you avoid mismatches and rework.

Whether you’re replacing a failed unit, expanding a panel, or standardizing protection across multiple circuits, the Siemens B140HH 40A 120V 1-pole bolt-on breaker is engineered to deliver predictable performance when it matters most—protecting people, wiring, and devices in your electrical system.