Square D MGL36450 - 450 A, 600 V, 3-Pole Circuit Breaker | AmpState

Square D MGL36450 - 450A, 600V, 3-Pole Molded Case Circuit Breaker is engineered to deliver reliable branch circuit overcurrent and short-circuit protection in panelboards and load centers. This 3-pole MCCB combines a compact molded case design with a thermal-magnetic trip unit for stable protection across a wide range of residential, commercial, and light industrial applications.

Key specifications

• Amperage rating: 450 A
• Voltage rating: 600 V
• Poles: 3
• Trip mechanism: Thermal-magnetic trip unit for instantaneous short-circuit protection and coordinated overload protection
• Style: Molded case circuit breaker (MCCB)
• Applications: Suitable for use in panelboards and load centers as a branch circuit protector

What makes it unique

Designed to maximize panel real estate, the MGL36450's compact molded case fits into tight spaces without sacrificing protection. The thermal-magnetic trip provides repeatable performance, reducing nuisance trips while reliably interrupting fault currents when needed. Its compatibility with matching OEM load centers and panelboards simplifies replacements and upgrades, helping you maintain a clean, code-compliant distribution system.

Ideal use cases

• Residential subpanels requiring robust three-phase protection for large feeders or equipment
• Commercial electrical rooms with multiple branch circuits and high-current loads
• Light industrial panels where dependable protection for distribution circuits is essential

Practical considerations and tips

When installing the MGL36450, ensure your panelboard is rated for 600 V and supports 3-pole MCCBs. For best results, pair this breaker with the corresponding OEM load center or panelboard, and plan for potential expansion by selecting a panel with spare spaces. Regularly inspect connections to prevent loose terminations, and follow all local electrical codes and manufacturer guidelines for secure, long-lasting protection.