Siemens LGB2B050B - 50 A, 600 V, 2-Pole Bolt-On Circuit Breaker | AmpState

The Siemens LGB2B050B is a 50A, 600V, 2-pole bolt-on molded case circuit breaker designed to deliver dependable branch circuit overcurrent and short-circuit protection in panelboards and loadcenters. Built for robust performance in a range of environments, this breaker combines a secure mounting method with precise protective action, making it a reliable choice for upgrading or maintaining electrical safety in power distribution systems.

Why this breaker stands out

• Secure bolt-on mounting: Provides a rigid, vibration-resistant connection to the bus, helping maintain consistent electrical contact and reducing the risk of loose connections in demanding installations.
• Thermal-magnetic trip unit: Delivers stable, repeatable protection by combining overload (thermal) and short-circuit (magnetic) response, helping to quickly isolate faults without nuisance tripping.
• OEM-friendly compatibility: Engineered to work with matching Siemens OEM loadcenters and panelboards, simplifying replacement or expansion projects and preserving system integrity.
• Versatile for multiple sectors: Suitable for residential, commercial, and light industrial applications where reliable branch-circuit protection is critical.

Ideal use scenarios

Use the Siemens LGB2B050B to protect 240V branch circuits and equipment in panelboards and loadcenters. It’s an excellent fit for:

• Upgrading older distribution panels to meet current protection requirements
• Powering high-demand 240V loads such as air conditioning, large heating elements, or workshop equipment
• New installations in residential basements, small commercial spaces, or light industrial facilities where a dependable 2-pole, 50A breaker is needed

Compatibility and installation at a glance

This bolt-on breaker is designed to pair with Siemens panelboards and loadcenters that specify bolt-on, molded case devices. For best results, ensure the matching OEM hardware and bus connections are in place, and follow standard electrical safety practices during installation. The bolt-on style provides a straightforward mounting approach that remains secure through typical vibrations and load variations in daily operation.

Technical specifications

• Manufacturer: Siemens
• Part number: LGB2B050B
• Type: Thermal-magnetic molded case circuit breaker
• Amperage rating: 50A
• Voltage rating: 600V
• Number of poles: 2
• Mounting style: Bolt-on
• Application: Branch circuit overcurrent and short-circuit protection

What you gain with the Siemens LGB2B050B

Reliable protection with predictable trip performance, a mounting approach that resists vibration over time, and seamless compatibility with Siemens panelboards. Whether you’re performing a targeted replacement in an existing installation or specifying components for a new build, this 2-pole 50A breaker helps you maintain safe, efficient power distribution with minimal downtime and maintenance.