Siemens LGB1K045B 45A 1-Pole 347 V Circuit Breaker

Introducing the Siemens LGB1K045B — a focused, reliable solution for protecting a single hot conductor in 347 V electrical systems. With a 45 A current rating and a 1-pole design, this circuit breaker delivers straightforward, dependable overcurrent protection in commercial and light-industrial panels.

Key specifications

• Current rating: 45 A
• Poles: 1
• Voltage rating: 347 V
• Part number: LGB1K045B

Why this breaker stands out

Designed for Siemens-compatible panels and enclosures, the LGB1K045B combines a compact footprint with a robust thermal-magnetic trip mechanism. This means precise, predictable protection against overloads and short circuits on a single leg, helping to safeguard wiring, devices, and downstream equipment in 347 V distribution environments.

Ideal applications

• Single-circuit protection for 347 V lighting and power feeders in commercial buildings
• Branch-circuit protection for equipment connected to a dedicated 347 V supply
• Control circuits and small machinery feeders within Siemens-compatible panel boards

Practical considerations and installation tips

When using the LGB1K045B, ensure your panel supports 1-pole breakers of the LGB family and that the conductors are sized for a 45 A rating. Confirm that the circuit’s voltage and load align with the 347 V specification, and install in accordance with local electrical codes. For best results, pair this breaker with correctly rated conductors and secure, clean connections to maintain reliable protection over time.

Choose the Siemens LGB1K045B 45A 1-Pole 347 V Circuit Breaker when you need precise single-leg protection tailored for 347-volt systems. Its specific rating and design address real-world commercial and industrial use cases, offering a dependable, straightforward solution that aligns with Siemens panel ecosystems.