Siemens LGB3B020 20A 3-Pole 480 V Circuit Breaker Potential Transformer

Siemens LGB3B020 is a rugged, three-pole circuit breaker engineered for demanding 3‑phase power distributions. With a 20 A current rating per pole and a 480 V voltage rating, this unit delivers reliable protection for motors, feeders, and critical equipment in industrial environments. The part number LGB3B020 makes ordering and replacement straightforward within Siemens panels and protection schemes.

Designed to interrupt faults quickly across all three phases, this 3‑pole breaker promotes coordinated protection that helps minimize damage to downstream equipment and wiring. Its robust construction and precise trip characteristics are built to withstand the demands of busy electrical rooms and manufacturing floors.

Key specifications

• Current rating: 20 A
• Poles: 3
• Voltage rating: 480 V
• Part Number: LGB3B020
• Configuration: 3‑pole circuit protection

Why this model stands out

• Three-pole coordination: Simultaneous disconnection of all phases reduces the risk of asymmetric faults, protecting both equipment and the integrity of the power distribution system.
• Siemens integration: Seamless compatibility with Siemens panels, accessories, and protection schemes simplifies installation, maintenance, and future upgrades.
• Potential transformer-ready: Designed to fit into protection and metering setups that use potential transformers, enabling accurate monitoring and coordination in complex networks.

Ideal use cases

• Motor circuits for conveyors, pumps, compressors, and fans powered from 480 V three‑phase systems.
• Feeder protection in industrial control panels, switchgear rooms, and manufacturing lines.
• Panel upgrades or replacements where Siemens LGB series breakers are the standard reference.

With the Siemens LGB3B020, you get precise, dependable protection designed for real-world industrial power needs. Its 20 A per‑pole rating and 3‑pole, 480 V configuration provide a scalable solution for safe and efficient three-phase distribution, while its compatibility with potential transformer-based monitoring supports advanced protection strategies. For engineers and technicians seeking a reliable, easy-to-specify circuit interrupter within Siemens ecosystems, the LGB3B020 is a thoughtful, future‑ready choice.