Square D LH36300 - 300 A, 600 V, 3-Pole Plug-In Circuit Breaker | AmpState

Square D LH36300 — 300A, 600V, 3-Pole Plug-In Molded Case Circuit Breaker is engineered to deliver dependable branch-circuit overcurrent and short-circuit protection in panelboards and load centers. Designed for quick swaps and lasting performance, this 3-pole plug-in breaker is a trusted choice for demanding electrical installations where uptime matters.

• Fast plug-in connection for rapid installation and easy replacement, reducing panel downtime during upgrades or servicing.
• Thermal-magnetic trip unit provides stable, repeatable protection against both overloads and short circuits across a range of loads.
• OEM-compatible with matching Square D load centers and panelboards, ensuring proper fit, coordinated trip performance, and reliable operation.
• Versatile application suitable for residential, commercial, and light industrial electrical systems that require high-current protection.

Technical specifications

• Manufacturer: Square D
• Part Number: LH36300
• Type: Thermal-magnetic molded case circuit breaker
• Amperage Rating: 300A
• Voltage Rating: 600V
• Number of Poles: 3
• Mounting Style: Plug-in
• Application: Branch circuit overcurrent and short-circuit protection

Ideal use scenarios

• Upgrading panelboards or load centers in commercial spaces that require robust 3-phase protection with a single high-current device.
• Retrofits in residential or light industrial feeders where reliable 300A protection is needed.
• Installations where quick, tool-free plug-in replacement minimizes downtime and simplifies maintenance workflows.

Why this Square D LH36300 stands out: it pairs a high-current 300A rating with a rugged 3-pole plug-in design and a thermal-magnetic trip mechanism that sharply responds to fault conditions while maintaining consistent protection. The result is safer electrical distribution, less nuisance tripping, and fewer interruptions during critical operations. When paired with compatible Square D panels, you get predictable trip characteristics and proven performance that align with standard electrical codes and panel labeling.

Who this is for: electrical contractors, facilities managers, building owners, and distributors who need reliable, code-compliant, high-current protection in panelboards and load centers without sacrificing installation speed or compatibility.

Tip for installers: verify panel compatibility with the LH36300 model number and ensure torque and termination guidelines from the panel manufacturer are followed for optimal performance and safety.