Siemens LGB3B050B - 50 A, 600 V, 3-Pole Bolt-On Circuit Breaker | AmpState

Designed for dependable protection in panelboards and load centers, the Siemens LGB3B050B is a 3-pole molded-case circuit breaker rated for 50A and 600V, with a sturdy bolt-on mounting that keeps the bus connection secure even in vibration-heavy environments. This is not just a breaker—it's a critical safety and reliability component for residential, commercial, and light industrial electrical systems.

Core advantages

• Bolt-on mounting for a rigid, vibration-resistant bus connection—reduces movement and improves reliability in panels that experience door operation or mechanical vibration.
• Thermal-magnetic trip unit with stable, repeatable protection—adapts to temperature changes and fault currents to trip reliably when needed.
• 3-pole design provides simultaneous protection of all three phases in a 3-phase system, ensuring balanced shutdowns and equipment protection.
• 600V rating and 50A capacity—suitable for a wide range of residential, commercial, and light industrial branch circuits.
• OEM panel compatibility—specifically designed to be compatible with matching Siemens OEM load centers and panelboards, ensuring a seamless fit and electrical performance.

What this breaker protects

The LGB3B050B offers branch circuit overcurrent protection and short-circuit protection. In the event of overload or fault, the thermal-magnetic trip unit opens the circuit to prevent wiring damage, fires, and equipment failure, while allowing quick restoration when the fault is cleared.

Ideal use scenarios

• New installations in Siemens-compatible load centers and panelboards for three-phase systems.
• Retrofitting existing panels that require a reliable 3-pole 50A protection device with bolt-on mounting.
• Facilities like small commercial offices, light manufacturing, and service equipment where a robust, durable breaker is essential.

Technical snapshot

• Manufacturer: Siemens
• Part number: LGB3B050B
• Type: Thermal-magnetic molded case circuit breaker
• Amperage rating: 50 A
• Voltage rating: 600 V
• Number of poles: 3
• Mounting style: Bolt-on
• Application: Branch circuit overcurrent and short-circuit protection

Choosing the Siemens LGB3B050B means prioritizing reliability and alignment with Siemens panel systems. It’s built to perform consistently in real-world electrical environments, keeping your power distribution safe and up to code while simplifying maintenance and replacement in the field.