Siemens LGB2K080B 80A 2-Pole 347 V Circuit Breaker Potential Transformer

Siemens LGB2K080B is a purpose-built protection device for demanding electrical distributions. This 80 A, 2-pole circuit breaker is rated for 347 V, delivering reliable current interruption and a robust safety margin in commercial and light industrial environments. Designed to integrate seamlessly into Siemens-compatible panels, it provides a precise, dependable solution for safeguarding circuits and equipment in complex power systems.

Key specifications

• Current rating: 80 A
• Poles: 2
• Voltage rating: 347 V
• Part number: LGB2K080B
• Manufacturer: Siemens

Why this breaker stands out

What sets the LGB2K080B apart is its precise Siemens engineering tailored for reliability in real-world distribution panels. The two-pole design provides balanced protection for multi-wire branch circuits, while the 347 V rating supports high- voltage commercial installations. With a focus on consistent performance, this breaker is built to handle routine overloads and short-circuit events, helping to reduce downtime and protect connected equipment.

Ideal use cases

• Protection for 347 V distribution circuits in commercial buildings, schools, and light industrial facilities
• Branch-circuit protection where an 80 A rating aligns with load calculations and feeder design
• Systems that involve potential transformer-based metering or protection schemes, where reliable, coordinated disconnects are critical

Installation and compatibility

Designed for compatibility with standard electrical panels that accept Siemens 2-pole breakers, the LGB2K080B offers straightforward replacement in compatible configurations. When planning protection strategies, verify panel labeling and ensure system voltage and conductor sizing align with the 347 V rating and 80 A current rating. This part number provides a precise, ready-to-order solution for maintaining consistent protection across the distribution network.

Practical considerations

• Pair this breaker with appropriate feeders and protection schemes to maintain system integrity in high-occupancy commercial spaces
• Use in conjunction with metering or control circuits that rely on protective relays and potential transformer setups for accurate monitoring