Square D MJL36500 - 500 A, 600 V, 3-Pole Circuit Breaker | AmpState

The Square D MJL36500 is a robust 3-pole molded case circuit breaker designed to safeguard your electrical installation with precise, dependable protection. With a 500 A rating and a 600 V maximum, it is built to support demanding branch circuits in panelboards and loadcenters across residential, commercial, and light industrial environments.

Smart, space-efficient protection

Engineered in a compact molded case design, the MJL36500 maximizes panel space without compromising reliability. Its streamlined footprint makes it easier to fit into crowded panels while still delivering strong protection where you need it most.

Thermal-magnetic protection you can rely on

The integrated thermal-magnetic trip unit provides stable, repeatable protection across a range of operating conditions. This means effective thermal overload protection combined with the instantaneous magnetic trip for short-circuit events, helping minimize downtime and prevent damage to wiring and equipment.

Designed for compatibility with Square D systems

Perfectly suited for matching OEM loadcenters and panelboards, this breaker ensures clean electrical coordination within your Square D installation. It’s an ideal replacement part or a precise fit for new builds that use Square D protection devices.

Technical snapshot

• Manufacturer: Square D
• Part Number: MJL36500
• Type: Thermal-magnetic molded case circuit breaker
• Amperage Rating: 500 A
• Voltage Rating: 600 V
• Number of Poles: 3
• Application: Branch circuit overcurrent and short-circuit protection

Practical use cases

• Protect three-phase feeders in light commercial or industrial panel installations requiring solid 3-pole protection
• Replace a failed 500 A breaker in Square D panelboards to restore reliable service quickly
• Install in new projects where space is at a premium but high-current protection is essential

Why choose the MJL36500

Choosing this Square D breaker means aligning with a trusted industry standard. Its thermal-magnetic design delivers predictable response under diverse loads, helping you maintain steady system performance and safety. For installers and facility managers, it offers a straightforward, compatible solution that integrates smoothly with existing Square D panels and protective schemes.