Siemens LGB1B025B - 25 A, 347 V, 1-Pole Bolt-On Circuit Breaker | AmpState

The Siemens LGB1B025B is a purpose-built, 25A, 347V, 1-pole bolt-on molded case circuit breaker engineered to protect your electrical systems with precision. Designed for dependable branch circuit overcurrent and short‑circuit protection, it’s a trusted choice for panelboards and loadcenters where reliability matters most.

• Secure bolt-on mounting for a rigid, vibration‑resistant bus connection that maintains consistent contact even in environments with movement or vibration.
• Thermal‑magnetic trip unit combines overload and short‑circuit protection, delivering stable, repeatable performance under a wide range of operating conditions.
• OEM compatibility designed to be compatible with matching Siemens loadcenters and panelboards, ensuring a cohesive protection system.
• Versatile reach suitable for residential, commercial, and light industrial applications, handling common single‑phase branch circuits with ease.
• Solid electrical performance rated for up to 347V, making it a practical choice for distribution panels in settings that operate above typical residential voltages.

Why this breaker stands out

Unlike generic alternatives, the LGB1B025B is built around Siemens’ proven molded‑case technology, delivering predictable tripping characteristics and long‑term reliability. Its bolt-on design simplifies installation in compatible panelboards and loadcenters, reducing setup time while preserving a robust bus connection that resists loosening over time. If your project requires a dedicated single‑pole solution that won’t compromise protection performance in busy electrical spaces, this unit delivers.

Use cases and ideal environments

Ideal for single‑pole branch circuits in residential service panels, small commercial distribution boards, and light industrial panels where compact, dependable overcurrent protection is needed. It’s well-suited for lighting circuits, receptacle runs, and other single‑phase loads within rating limits, providing clear protection separation and easy replacement within Siemens‑equipped systems.

Specifications at a glance

• Manufacturer: Siemens
• Part number: LGB1B025B
• Type: Thermal‑magnetic molded case circuit breaker
• Amperage rating: 25A
• Voltage rating: 347V
• Poles: 1
• Mounting style: Bolt-on
• Applications: Branch circuit overcurrent and short‑circuit protection

Practical installation and maintenance tips

To ensure optimal performance, pair this breaker with matching Siemens OEM panelboards or loadcenters. Verify that the panel’s rating supports a 347V single‑pole protector and follow the manufacturer’s torque specs for bolt‑on mounting. Regularly inspect the breaker during routine panel maintenance to confirm the bus connections remain tight and free of corrosion or debris, and replace only with a like‑for‑like Siemens unit to preserve protection characteristics.

Equip your electrical distribution with a precise, durable protection solution—the Siemens LGB1B025B 25A, 347V, 1‑pole bolt‑on circuit breaker. Built for reliability in residential, commercial, and light industrial environments, it’s a tailored choice for dependable, long‑term circuit protection within Siemens‑equipped systems.