Siemens B145H - 45 A, 120 V, 1-Pole Bolt-On Circuit Breaker | AmpState

Siemens B145H is a reliable 45A, 120V, 1-pole bolt-on molded case circuit breaker designed to protect branch circuits from overcurrent and short circuits in panelboards and load centers. Built for enduring performance, it delivers precise, predictable protection when it matters most.

• Secure bolt-on mounting: a rigid, vibration-resistant bus connection that stays tight under demanding conditions, reducing the risk of loose connections and intermittent trips.
• Thermal-magnetic trip unit: combines thermal overload protection with magnetic instantaneous trip for fast, stable response to both gradual overcurrents and sudden short-circuit events.
• OEM-compatible design: engineered to work with matching Siemens OEM load centers and panelboards, ensuring proper fit, electrical characteristics, and streamlined replacement.
• Versatile for multiple settings: ideal for residential, commercial, and light industrial panel installations where dependable single-pole protection is required for 120V circuits.

The B145H is specifically suited for protecting single-phase branch circuits in a variety of environments—from home electrical panels to small commercial distribution boxes and light industrial subpanels. Its bolt-on construction minimizes movement over time, helping maintain a solid electrical connection even in vibration-prone installations. With a 45A rating and 120V operation, it provides targeted protection for circuits that demand reliable, code-compliant performance without unnecessary nuisance trips.

Why choose Siemens B145H?

Choosing this breaker means prioritizing a trusted, purpose-built solution from Siemens that aligns with your existing load centers and panelboards. The thermal-magnetic trip unit delivers precise protection tailored to typical residential and light commercial loads, while the bolt-on mounting offers a secure, maintenance-friendly installation. If you’re upgrading an older panel or outfitting a new project, the B145H delivers predictable protection with a compact, single-pole form factor designed for straightforward integration.

Specifications at a glance

• Manufacturer: Siemens
• Part Number: B145H
• Type: Thermal-magnetic molded case circuit breaker
• Amperage Rating: 45A
• Voltage Rating: 120V
• Number of Poles: 1
• Mounting Style: Bolt-on
• Application: Branch circuit overcurrent and short-circuit protection