Siemens LGB1K050B 50A 1-Pole 347 V Circuit Breaker

Introducing the Siemens LGB1K050B — a purpose-built protection device for 347V distribution networks. This 50A, 1-pole circuit breaker safeguards a single hot conductor, interrupting fault currents to prevent damage and reduce risk in commercial and industrial electrical systems.

The LGB1K050B is designed for use in panels and distribution boards that accept Siemens LGB-series breakers. With a 347 V rating, it fits 347Y/600 V style systems common in modern commercial buildings where lighting and receptacle circuits run on higher line voltages. Its single-pole configuration makes it ideal for protecting individual branches without unnecessarily disconnecting other legs of the system.

Key specifications

• Current rating: 50 A
• Poles: 1
• Voltage rating: 347 V
• Part number: LGB1K050B
• Brand: Siemens

What sets this breaker apart

Rather than a generic component, the LGB1K050B is built to integrate with Siemens distribution ecosystems, providing consistent trip characteristics and dependable performance across typical operating conditions. Its 1-pole design targets a single branch, allowing precise protection where you need it most while keeping other circuits energized.

Ideal use cases

• Protecting individual lighting or outlet branches in commercial facilities powered by 347V systems.
• Replacement in Siemens panels that specify LGB-series breakers for straightforward maintenance and compatibility.
• Short-circuit and overcurrent protection for feeders supplying equipment that operates at 347V.

Installation and safety notes

Install by a qualified electrician following local electrical codes. Ensure the panel and conductor sizing match a 50 A, 347 V single-pole device and verify the line connections correspond to the breaker’s orientation. Use appropriate enclosure labeling to clearly indicate protected circuits.