Square D PJA36120U33 A - 1200 A, 600 V, 3-Pole Plug-In Circuit Breaker | AmpState

When you need dependable, high-capacity protection for demanding electrical systems, the Square D PJA36120U33A delivers. This 1200A, 600V, 3-pole plug-in molded case circuit breaker is engineered for fast, reliable overcurrent and short-circuit protection in panelboards and load centers, keeping critical equipment safe and uptime high.

Built for speed, precision, and longevity

• Fast plug-in connection: Snap-in mounting enables quick installation or replacement, minimizing downtime during maintenance or upgrades.
• Thermal-magnetic trip unit: Combines thermal and magnetic sensing to deliver stable, repeatable protection across a wide range of loads and fault currents, reducing nuisance trips and ensuring immediate response to short circuits.
• 3-pole design for 3-phase protection: Protects all three phases with a single device, ideal for high-capacity feeders and main circuits in commercial or light industrial environments.
• 600V rating: Designed for robust performance in common distribution voltages, providing reliable interrupting capability where it matters most.
• OEM compatibility: Engineered to pair with matching Square D OEM load centers and panelboards, preserving fit, performance, and warranty integrity.
• Versatile application range: Suitable for residential, commercial, and light industrial settings where dependable branch-circuit overcurrent and short-circuit protection is required.

Technical snapshot

• Manufacturer: Square D
• Part Number: PJA36120U33A
• Type: Thermal-magnetic molded case circuit breaker
• Amperage Rating: 1200A
• Voltage Rating: 600V
• Number of Poles: 3
• Mounting Style: Plug-in
• Application: Branch circuit overcurrent and short-circuit protection

Ideal use cases and practical installation insights

• Use as a high-capacity main or feeder breaker in panelboards and load centers where three-phase distribution and heavy loads are present.
• Replace failed or aging breakers in commercial or light industrial electrical rooms that require quick, reliable plug-in upgrades.
• Integrate with OEM-matched Square D panelboards to maintain compatibility, labeling, and performance characteristics.
• Install in scenarios demanding precise protection against overcurrent events while minimizing downtime during service or upgrades.

Choosing the Square D PJA36120U33A means selecting a robust, plug-in solution that prioritizes installation efficiency, protection accuracy, and long-term compatibility with your panelboard ecosystem. For environments where reliability and speed matter—from busy service entrances to critical commercial facilities—this 3-pole, 1200A, 600V breaker delivers clear value and dependable performance.