Square D PJA36100U44 A - 1000 A, 600 V, 3-Pole Plug-In Circuit Breaker | AmpState

The Square D PJA36100U44A is a high-capacity 1000A, 600V, 3-pole plug-in molded case circuit breaker designed to safeguard panelboards and load centers from overloads and short circuits. Built for demanding electrical environments, it delivers reliable, fast-acting protection where it matters most.

Key features that matter in real-world installations:

• Fast plug-in connection: simplifies installation and replacement, minimizing downtime during panel upgrades or servicing.
• Thermal-magnetic trip unit: combines precise thermal overload protection with magnetic short-circuit interruption for stable, repeatable performance across varying loads and temperatures.
• 3-pole design: provides true 3-phase protection with coordinated disconnection across all phases, reducing arc risk and ensuring comprehensive system safety.
• OEM-compatible: designed to work with matching Square D load centers and panelboards, helping maintain consistent trip curves and dependable system coordination.
• Versatile application: suitable for residential, commercial, and light industrial settings where high-current branch protection and reliable main/feeder protection are required.

Ideal use scenarios include serving as a main disconnect or heavy feeder protection in large panelboards, upgrading protection in commercial spaces, or enabling scalable, safe power distribution in light industrial environments. The plug-in design paired with a robust molded-case construction keeps maintenance straightforward and downtime minimal, so you can keep critical systems online with confidence.

Technical specifications

• Manufacturer: Square D
• Part Number: PJA36100U44A
• Type: Thermal-magnetic molded case circuit breaker
• Amperage Rating: 1000A
• Voltage Rating: 600V
• Number of Poles: 3
• Mounting Style: Plug-in
• Application: Branch circuit overcurrent and short-circuit protection

Choose the PJA36100U44A when you need robust, dependable protection for high-current panel environments, paired with the convenience of a plug-in installation and compatibility with Square D panelboard ecosystems.