Siemens LGB2B030B - 30 A, 600 V, 2-Pole Bolt-On Circuit Breaker | AmpState

Meet the Siemens LGB2B030B—a 30A, 600V, 2-pole bolt-on molded case circuit breaker built to deliver dependable branch circuit protection in panelboards and load centers. Designed for residential, commercial, and light industrial applications, this breaker combines solid mechanical mounting with precise protection functionality to keep electrical systems safe and up and running.

Why choose the LGB2B030B

• Secure bolt-on mounting—provides a rigid, vibration-resistant bus connection that stays tight under equipment vibration and environmental movement, reducing the risk of intermittent contacts.
• Thermal-magnetic trip unit—delivers stable, repeatable protection by combining thermal overload sensing with magnetic short-circuit interruption for fast, predictable response when a fault occurs.
• Two-pole design—interrupts both conductors simultaneously for safer, more reliable fault clearance and arc suppression in commonly used 120/240V circuits.
• 20|handy compatibility—works with matching OEM load centers and panelboards, simplifying upgrades, replacements, or panel expansions without sacrificing performance.
• Versatile voltage and current ratings—30A at 600V makes it suitable for a wide range of distribution circuits in homes, offices, and light industrial environments.
• Compact molded-case build—offers robust protection in a space-conscious package, helping maximize panel capacity without compromising safety.

Technical details

• Manufacturer: Siemens
• Part Number: LGB2B030B
• Type: Thermal-magnetic molded case circuit breaker
• Amperage Rating: 30A
• Voltage Rating: 600V
• Number of Poles: 2
• Mounting Style: Bolt-on
• Application: Branch circuit overcurrent and short-circuit protection

Ideal use cases

Use the LGB2B030B to protect branch circuits in residential subpanels, small commercial service panels, or light industrial distribution boxes. It’s particularly well-suited for panels that experience vibration or require a secure, long-lasting connection. If you’re upgrading an existing panel or designing a new layout, this bolt-on breaker provides a robust alternative to clip-on options, with reliable trip performance and straightforward installation.

Practical benefits and how it solves problems

• Reliability in challenging environments—the bolt-on design minimizes connection risk from vibration, ensuring consistent electrical contact over time.
• Predictable protection—the dual-mode trip (thermal for overload, magnetic for short circuits) delivers dependable protection without nuisance trips in normal operation.
• Ease of integration—OEM-compatible compatibility reduces the guesswork during panel replacements or expansions, helping maintain system integrity.
• Safe, coordinated disconnection—2-pole operation ensures both lines open together, reducing arc energy and improving overall panel safety.

Tips for installation and best practices

Ensure the target panelboard supports bolt-on breakers like the LGB2B030B, and follow the manufacturer’s torque specifications for the mounting hardware. Use the correct conductor sizing for a 30A circuit, and verify that the protected load does not exceed the panel’s overall rating. For panel upgrades or reconfigurations, pairing the LGB2B030B with a Siemens-compatible enclosure helps maintain electrical coordination and system reliability.

With the Siemens LGB2B030B, you gain a trusted, purpose-built solution for robust branch circuit protection that stands up to real-world demands—delivering safety, reliability, and straightforward integration in a variety of panel environments.