Square D PJA36120SA - 1200 A, 600 V, 3-Pole Plug-In Circuit Breaker | AmpState

Introducing the Square D PJA36120SA—a high-capacity plug-in molded case circuit breaker designed to protect critical electrical distributions in panelboards and load centers. With a 1200 A rating at up to 600 V and a precise 3-pole configuration, this device delivers reliable, repeatable protection for demanding residential, commercial, and light industrial applications.

Why this breaker stands out

• Fast plug-in connection for quick installation and effortless replacement, reducing downtime during maintenance or upgrades.
• Thermal-magnetic trip unit provides stable, repeatable protection against overloads and short circuits, helping prevent nuisance trips while safeguarding equipment.
• OEM-compatible design is intended for use with matching Square D load centers and panelboards, ensuring seamless integration and reliable performance.
• Three-pole configuration ensures balanced protection across phases, ideal for multi-wire branch circuits and complex distribution schemes.
• Rugged molded case construction supports durability in space-constrained panels and varied operating environments.

Technical specifications at a glance

• Manufacturer: Square D
• Part number: PJA36120SA
• Type: Thermal-magnetic molded case circuit breaker
• Amperage rating: 1200 A
• Voltage rating: 600 V
• Poles: 3
• Mounting style: Plug-in
• Application: Branch circuit overcurrent and short-circuit protection

Ideal use cases

Choose the Square D PJA36120SA for high-demand power distribution needs including:

• Residential expansions where large feeders and multi‑wire circuits require robust protection
• Commercial panels and light industrial panels needing dependable protection for heavy load centers
• Retrofits or upgrades in existing panelboards where fast replacement minimizes downtime
• New installations that demand a compatible, high-capacity plug-in breaker within the Square D OEM ecosystem

Installation and compatibility tips

To ensure optimal performance, verify your panelboard is designed for plug-in molded case breakers in the PJA36120SA family and that the bus connections are compatible with the device’s plug-in mounting. The fast plug-in design enables rapid changes during scheduled maintenance, transfers, or upgrades, while the thermal-magnetic trip ensures dependable protection aligned with real-world load conditions.

Engineered for reliability, the Square D PJA36120SA delivers clear value for projects where high-current protection, quick serviceability, and OEM compatibility matter most. If you’re upgrading a distribution system or equipping a new panel, this 1200 A, 600 V, 3-pole plug-in breaker is built to perform when it counts.