Siemens B145 - 45 A, 120 V, 1-Pole Bolt-On Circuit Breaker | AmpState

The Siemens B145 is a dependable 1-pole, 45A bolt-on molded case circuit breaker designed to protect your electrical distribution with precision. Built for reliable branch-circuit overcurrent and short-circuit protection, it’s the right choice for panelboards and load centers where solid performance and secure connections matter. Key benefits that set the B145 apart - Secure bolt-on mounting: locks onto the bus connection for a rigid, vibration-resistant fit that maintains consistent electrical contact and reduces the risk of loose connections over time. - Thermal-magnetic protection: combines thermal overload sensing with magnetic short-circuit fast-tripping, delivering stable, repeatable protection under diverse load conditions. - Direct compatibility: engineered to pair with matching Siemens OEM load centers and panelboards, ensuring a clean, code-compliant installation. - Versatile applications: ideal for residential, commercial, and light industrial environments where dependable protection for branch circuits is essential. - Straightforward replacement: part of the Siemens B-series, providing a straightforward option for upgrading or replacing aging or non-functioning breakers in existing Siemens systems. Why choose the Siemens B145 for your electrical system If you’re upgrading a panelboard or load center that requires a trustworthy, bolt-on, single-pole solution, the B145 delivers. Its 45A rating is well-suited for branch circuits that demand solid protection without overreacting to normal inrush or transient spikes. The 120V rating aligns with standard low-voltage residential and light commercial circuits, making it a practical, compatible choice for many installations. Specifications at a glance - Manufacturer: Siemens - Part Number: B145 - 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 Who this is for - Homeowners and electricians replacing a faulty or aging breaker within Siemens panelboards and load centers - Projects requiring a secure, vibration-resistant connection to minimize arcing and connection looseness - Settings where dependable magnetic trip response is needed for quick fault isolation With the Siemens B145, you gain a reliable, purpose-built solution that protects wiring, reduces downtime, and keeps your electrical system running smoothly.