Siemens | LGB3K020B | Circuit Breaker | 20A | 3-Pole | 600V

Siemens LGB3K020B is a robust 20-amp, three-pole circuit breaker designed to deliver reliable overcurrent protection for three-phase systems up to 600V. Built for maintenance, retrofit, and replacement projects, this genuine Siemens component ensures exact fit and reliable performance in compatible panels.

What this breaker protects and where to use it

Ideal for three-phase electrical distributions in industrial and commercial environments, the LGB3K020B shields motors, conveyors, pumps, and other three-phase equipment from overloads and short circuits. Its 20A rating makes it well-suited for motor circuits and equipment with moderate startup currents, while its 600V rating supports higher-voltage applications common in modern electrical installations.

Key specifications

• Amperage: 20 A
• Poles: 3-Pole
• Voltage rating: 600V
• Part reference: LGB3K020B

Why choose this Siemens circuit breaker

• Genuine part for reliable performance: Using the exact Siemens LGB3K020B ensures consistent trip characteristics and compatibility with Siemens panels and bus assemblies.
• Precise fit for maintenance and retrofits: The 3-pole configuration protects all hot lines in a three-phase system, delivering balanced protection and simplifying panel upgrades or replacements.
• Clear compatibility reference: The part number LGB3K020B is the best reference for ensuring you’re ordering the correct component for your panel’s specifications.
• Industrial-grade protection: With a 600V rating, this breaker is built to handle higher-voltage environments typical of manufacturing, logistics, and processing facilities.

Practical considerations and usage tips

Before ordering, verify that your panel accepts the LGB3K020B and that the conductor sizing and enclosure style match the installation requirements. Use this breaker for replacement in Siemens-compatible feeders or motor control centers, and pair it with appropriate overload protection and wiring practices as outlined in the panel documentation. For best results, consult the panel’s labeling to confirm fit and rating alignment with the LGB3K020B.

Who benefits most

This breaker is a strong fit for electrical contractors, facilities engineers, and maintenance teams managing three-phase distributions in warehouses, factories, and bulk-processing environments where Siemens compatibility and dependable trip performance are priorities.