Siemens B115 - 15 A, 120 V, 1-Pole Bolt-On Circuit Breaker | AmpState

The Siemens B115 is a 15A, 120V, 1-pole bolt-on molded case circuit breaker designed to deliver reliable branch circuit protection in panelboards and load centers. Built for enduring performance, its bolt-on mounting creates a rigid, vibration-resistant connection to the bus, helping maintain consistent protection even in demanding electrical environments. Ideal for residential, commercial, and light industrial applications, this breaker combines safety with straightforward, long-term serviceability.

Key advantages that matter in real-world panels

• Secure bolt-on mounting—a rigid connection that minimizes bus movement and maintains stable electrical contact, reducing nuisance trips caused by vibration or panel flex.
• Thermal-magnetic trip unit—the thermal element provides precise overload protection while the magnetic element rapidly responds to short circuits, delivering stable, repeatable protection without manual adjustment.
• Single-pole, 15A, 120V—perfect for standard 120V branch circuits such as lighting, receptacles, and small appliance runs in many homes and light commercial setups.
• OEM-friendly compatibility—designed to pair with matching Siemens OEM load centers and panelboards for a seamless replacement or upgrade path.
• Versatile application range—reliable protection across residential, commercial, and light industrial environments where consistent overcurrent and short-circuit protection is essential.

Specifications at a glance

• Manufacturer: Siemens
• Part Number: B115
• Type: Thermal-magnetic molded case circuit breaker
• Amperage Rating: 15A
• Voltage Rating: 120V
• Number of Poles: 1
• Mounting Style: Bolt-on
• Application: Branch circuit overcurrent and short-circuit protection

Practical use cases

• Replacing a faulty breaker in a Siemens panelboard to restore circuit protection without compatibility concerns.
• Installing a reliable 120V branch circuit for lighting or receptacle circuits in residential or small commercial spaces.
• Upgrading aging panels in light industrial environments where durable, maintenance-friendly protection is needed.
• Conducting routine panel maintenance with a fast, straightforward bolt-on replacement that minimizes downtime.

Installation and compatibility tips

Choose the Siemens B115 when your panelboard or load center is designed for bolt-on molded case breakers in the Siemens family. The bolt-on design delivers a secure bus connection, helping to ensure dependable current path and reduced arcing risk during fault conditions. When replacing a breaker, verify that the target panelboard is listed for compatible Siemens B115 units to ensure optimal performance and code-compliant protection.

Why this matters for your electrical safety and reliability

With a thermal-magnetic trip unit and a robust bolt-on mounting, the Siemens B115 delivers dependable, predictable protection that electricians and maintenance teams rely on. It protects branch circuits from overloads and short circuits, helping prevent damage to wiring, outlets, and connected equipment, while supporting straightforward serviceability and compatibility across Siemens panel products.