Siemens LGB3B100 - 100A, 3-Pole, Circuit Breaker

Siemens LGB3B100 — a 100A, 3-pole circuit breaker crafted to deliver reliable overcurrent protection for three-phase power systems. This compact, high-performance device is designed for seamless integration into panelboards, switchboards, and control panels where dependable operation matters most.

Built for demanding environments, the LGB3B100 provides robust protection for feeders and motor circuits in industrial, commercial, and OEM applications. In distribution panels and motor control centers, it quickly identifies overloads and short circuits, isolating faults to minimize downtime and safeguard wiring, components, and connected equipment.

Key features and benefits

• Current rating: 100A
• Poles: 3-Pole configuration for true three-phase protection
• Breaker type: Circuit Breaker for reliable, intentional disconnection
• Applications: ideal for panelboards, switchboards, and control panels in varied environments
• Suitable for: industrial, commercial, and OEM installations where dependable overcurrent protection is critical in distribution panels and motor control centers
• Protection scope: safeguards three-phase loads from overloads and short circuits while enabling safe, rapid isolation

Why it stands out

The Siemens LGB3B100 delivers coordinated, all-phases protection with a common trip characteristic, ensuring that when a fault occurs, all three phases disconnect together. This reduces the risk of phase-to-phase faults and equipment damage, and supports safer startup sequences for downstream motors and loads. Built to align with Siemens’ distribution and control ecosystems, it offers predictable performance and straightforward integration into existing Siemens-scale electrical infrastructure.

Ideal use cases

• New installations in panelboards, switchboards, and motor control centers serving three-phase equipment
• Upgrades and retrofits in industrial facilities where aging protection devices are being replaced with reliable Siemens hardware
• OEM equipment and machinery where compact, dependable overcurrent protection is required for three-phase circuits

Practical tips for installation and operation

• Verify compatibility with your panelboard or MCC’s busbar arrangement and mounting style to ensure a proper fit
• Plan for orderly spare breakers in the panel to minimize downtime during maintenance or expansion
• Follow standard electrical practices for wiring and termination to maintain secure connections and reliable performance