Siemens LGG3B125L - 125 A, 600 V, 3-Pole Circuit Breaker | AmpState

Introducing the Siemens LGG3B125L — a rugged 125 A, 600 V, 3-pole molded case circuit breaker built to guard your panelboards and loadcenters against overcurrent and short circuits. Designed for dependable performance in residential, commercial, and light industrial environments, this device pairs compact engineering with serious protection.

• Space-efficient molded case design frees up panel space and simplifies installation without sacrificing protection.
• Thermal-magnetic trip unit delivers stable, repeatable protection against overcurrent and short-circuit events, enhancing reliability over time.
• 3-pole configuration suited for three-phase distribution, providing coordinated protection across multiple conductors.
• 125 A at 600 V capability covers a wide range of branch circuits and equipment in commercial and light industrial settings.
• OEM-compatible works with matching Siemens load centers and panelboards for straightforward, plug-and-play upgrades or replacements.
• Versatile applications ideal for upgrading existing installations, new builds, or retrofits where dependable protection is essential.

The LGG3B125L is purpose-built to protect critical electrical infrastructure during routine operation and fault conditions. Its compact form factor fits tight panel assemblies, while the thermal-magnetic trip unit provides predictable response, helping prevent damage to wiring, devices, and downstream equipment.

Who benefits most from this breaker? Electrical contractors, facilities managers, and maintenance teams seeking a reliable, code-compliant solution for three-phase distribution in offices, retail spaces, light manufacturing, and other commercial environments. It’s also a solid choice for panelboard refresh projects where compatibility with Siemens OEM equipment matters.

Technical specifications

• Part number: LGG3B125L
• Type: Thermal-magnetic molded case circuit breaker
• Amperage rating: 125 A
• Voltage rating: 600 V
• Poles: 3
• Application: Branch circuit overcurrent and short-circuit protection

Installation and handling should be performed by a qualified electrician, with careful verification of panelboard compatibility and adherence to manufacturer instructions. The Siemens LGG3B125L delivers precise protection where it matters most, helping you maintain safe, reliable electrical service across a range of spaces and loads.