Square D MJA36800 - 800 A, 600 V, 3-Pole Plug-In Circuit Breaker | AmpState

Meet the Square D MJA36800 — a robust 800A, 600V, 3-pole plug-in molded case circuit breaker engineered to safeguard your panelboards and loadcenters. Built for dependable branch-circuit overcurrent and short-circuit protection, this unit delivers fast, field-ready protection that minimizes downtime during upgrades or servicing.

Key features

• Fast plug-in connection for quick installation and effortless replacement, reducing panel downtime.
• Thermal-magnetic trip unit provides stable, repeatable protection by responding appropriately to both overload and short-circuit conditions.
• 3-pole design suited for balanced protection in 3-phase systems common in commercial and light industrial environments.
• 600V rating accommodates higher voltage distribution within commercial, industrial, and multi-residential applications.
• 800A current rating handles high-load branch circuits, supporting demanding electrical loads.
• OEM compatibility designed to work with matching Square D loadcenters and panelboards for reliable fit and performance.
• Durable molded-case construction built to withstand the rigors of active electrical environments while maintaining long-term reliability.
• Versatile application suitable for residential, commercial, and light industrial installations that require rugged, dependable protection.

Why this matters

The MJA36800 combines two essential protection mechanisms in one unit: a thermal element that gently meters normal heating and overloads, and a magnetic element that delivers immediate short-circuit interruption. This dual-stage protection helps preserve wiring insulation, circuit conductors, and connected equipment while providing predictable tripping behavior across a wide range of fault conditions. The plug-in design not only speeds up installation but also simplifies future servicing or upgrades within your electrical distribution system.

Ideal applications

• New installations and panel upgrades in commercial buildings.
• Residential and light industrial electrical panels requiring robust 3-pole protection.
• Loadcenters and distribution boards where fast replacement and reliable, repeatable performance are critical.
• Systems where 600V operation and 800A capacity align with current or planned electrical loads.

Technical snapshot

• Manufacturer: Square D
• Part Number: MJA36800
• Type: Thermal-magnetic molded case circuit breaker
• Amperage Rating: 800A
• Voltage Rating: 600V
• Number of Poles: 3
• Mounting Style: Plug-in
• Application: Branch circuit overcurrent and short-circuit protection

Designed for compatibility with matching OEM loadcenters and panelboards, the Square D MJA36800 is a dependable choice for professionals who value precise protection, quick serviceability, and long-term reliability. Available through AmpState for seamless procurement and integration into your electrical distribution system.