Siemens LGB3B030B - 30 A, 600 V, 3-Pole Bolt-On Circuit Breaker | AmpState

Siemens LGB3B030B is a 30A, 600V, 3-pole bolt-on molded case circuit breaker designed to protect branch circuits and short circuits in panelboards and load centers. Built for dependable protection in residential, commercial, and light industrial environments, this unit pairs seamlessly with Siemens OEM panelboards for straightforward installation and reliable performance when you need it most.

Key differentiators that matter in the field

• Secure bolt-on mounting provides a rigid, vibration-resistant bus connection, reducing the risk of loose contacts in demanding installations.
• Thermal-magnetic trip unit delivers stable, repeatable protection against overcurrent and short-circuit events, helping to minimize nuisance trips and downtime.
• Three-pole design ensures synchronized protection across all phases in 3-phase systems, which is essential for motors, pumps, and other multi-wire loads.
• OEM compatibility is purpose-built to fit matching Siemens load centers and panelboards, simplifying replacements, upgrades, and serviceability.
• Versatile applications suited for residential, commercial, and light industrial electrical infrastructure, from home service panels to small business equipment rooms.

Technical specifications at a glance

• Manufacturer: Siemens
• Part Number: LGB3B030B
• Type: Thermal-magnetic molded case circuit breaker
• Amperage Rating: 30 A
• Voltage Rating: 600 V
• Number of Poles: 3
• Mounting Style: Bolt-on
• Application: Branch circuit overcurrent and short-circuit protection

Use cases and practical benefits

Ideal for upgrading aging panels or configuring new installations in 3‑phase environments. In commercial spaces, it protects motor-driven equipment like pumps and fans, as well as lighting and control circuits, while in light industrial settings it helps safeguard conveyors and small manufacturing lines. The combination of bolt-on reliability and a thermal-magnetic trip curve means fewer trips due to minor disturbances and a quicker response to actual faults—keeping downtime to a minimum.

Tips for optimal performance

• Match this breaker with compatible Siemens panelboards to ensure optimal electrical contact and coordinated protection.
• When replacing an older unit, verify the panel rating and ensure the existing bus connections are clean and undamaged before bolting the breaker in place.
• Follow manufacturer guidelines for torque and secure mounting to maintain the vibration-resistant benefits of the bolt-on design.