Square D MHL36300 - 300 A, 3-Pole Circuit Breaker | AmpState

Meet the Square D MHL36300, a 300A, 3-pole molded case circuit breaker designed to safeguard your panelboards and loadcenters with precision and reliability. Available through AmpState, this breaker sits at the heart of your electrical distribution, delivering dependable overcurrent and short-circuit protection where it matters most.

• Compact molded case design optimizes panel space, helping you fit more protection in tighter enclosures without compromising performance.
• Thermal-magnetic trip unit delivers stable, repeatable protection for both overloads and short circuits, reducing nuisance trips and promoting consistent electrical coordination.
• Three-pole configuration is ideal for 3-phase systems, making it a solid choice for commercial and light industrial applications as well as specific residential setups that require 3-phase protection.
• 300A rating provides robust main or feeder protection for larger distribution panels, supporting demanding equipment without sacrificing safety margins.
• OEM-compatible design ensures seamless integration with matching Square D load centers and panelboards, so installation and replacement feel straightforward and reliable.
• Versatile application suitable for residential, commercial, and light industrial environments, giving you a single solution that adapts to multiple project requirements.

Why this matters

In any distribution panel, the right breaker isn’t just about breaking the circuit—it’s about coordinated protection that you can count on under real-world conditions. The MHL36300’s thermal-magnetic trip mechanism responds quickly to faults and heat build-up, helping protect conductors, equipment, and people. Its sturdy molded-case construction stands up to routine panel maintenance and dense wiring environments found in busy facilities.

Technical snapshot

• Manufacturer: Square D
• Part number: MHL36300
• Type: Thermal-magnetic molded case circuit breaker
• Amperage rating: 300A
• Number of poles: 3
• Application: Branch circuit overcurrent and short-circuit protection

Practical use cases

• Installing or upgrading a commercial panelboard that serves multiple motors, lighting banks, and power feeds for HVAC and conveyors—where 3-phase protection and high current carrying capacity are essential.
• Upgrading a main feeder or subpanel where space is at a premium and you need a compact, reliable 3-pole solution that won’t compromise protection.
• Residential projects with 3-phase service requirements or specialized equipment protection in workshops and small-scale commercial spaces.

Choosing the Square D MHL36300…

• Ensures compatibility with OEM load centers and panelboards for a dependable, plug-and-play replacement or installation.
• Delivers clear protection goals with a reliable thermal-magnetic trip profile designed for real-world load patterns.
• Provides space-efficient protection in panels where every inch counts, without sacrificing performance or safety.

Invest in the MHL36300 300A 3-pole molded case circuit breaker for a thoughtful blend of durability, compatibility, and precise protection. Whether you’re stocking an electrical contractor’s toolkit or equipping a facility’s distribution panel, this Square D breaker from AmpState is built to perform when it matters most.