Siemens B150 - 50 A, 120 V, 1-Pole Bolt-On Circuit Breaker | AmpState

Meet the Siemens B150 — a rugged, reliable bolt-on molded case circuit breaker engineered for consistent branch circuit overcurrent and short-circuit protection in panelboards and loadcenters. With a 50A, 120V, 1-pole design, it delivers focused protection where you need it most, while the bolt-on mount provides lasting stability in demanding environments.

• Secure bolt-on mounting: Delivers a rigid, vibration-resistant bus connection that stays tight through operational conditions, reducing nuisance trips and maintained protection.
• Thermal-magnetic trip unit: Combines heat and magnetic sensing for stable, repeatable protection performance. It responds quickly to short circuits and correctly tolerates normal inrush, keeping circuits safeguarded without unnecessary interruptions.
• OEM compatibility: Designed to work with matching Siemens OEM loadcenters and panelboards, simplifying selection, stocking, and replacement in existing installations.
• 1-pole, 50A configuration: Ideal for securing single-circuit protection on feeders or branch circuits that require robust 50-amp protection at 120V in residential, commercial, or light industrial settings.

Technical Specifications

• Manufacturer: Siemens
• Part Number: B150
• Type: Thermal-magnetic molded case circuit breaker
• Amperage Rating: 50A
• Voltage Rating: 120V
• Number of Poles: 1
• Mounting Style: Bolt-on
• Application: Branch circuit overcurrent and short-circuit protection

Use Cases and Ideal Applications

Whether you’re upgrading an older panel or wiring a new install, the B150 shines in environments that demand dependable protection with straightforward maintenance. It’s well-suited for:

• Residential service panels and subpanels protecting dedicated circuits for major appliances, HVAC, or heavy-load outlets
• Commercial light-duty distributions serving outlets, lighting, and small equipment rooms
• Light industrial panelboards requiring durable, easy-to-service single-pole protection

Why this matters: a bolt-on design reduces wear on bus connections during installation and service, while the thermal-magnetic trip unit helps prevent nuisance trips and provides reliable protection aligned with real-world load conditions. When you need a trusted, compatible, single-pole solution that pairs cleanly with Siemens panel systems, the B150 delivers.

From AmpState, the Siemens B150 50A circuit breaker offers precise, code-compliant protection that installers and maintenance teams can trust. Built for longevity in panelboards and loadcenters, it’s a practical, targeted solution for safeguarding critical circuits without overcomplicating your electrical system.