Square D | PGA36040U43A | Circuit Breaker | 400A | 3-Pole | 600V | 35kA | Plug-In

Meet the Square D PGA36040U43A circuit breaker — a purpose-built 400 A, 3-pole, plug-in solution designed for demanding 600 V electrical systems. With a robust 35 kA interrupting capacity, this unit delivers dependable protection against overcurrent and short circuits in industrial panels and service enclosures.

The plug-in design enables fast, hassle-free replacement in compatible Square D panelboards, minimizing downtime during maintenance, retrofit, or installation projects. When your system calls for an exact match in ratings and form factor, PGA36040U43A is the precise reference you want for a reliable, long-lasting fit.

• Amperage: 400 A
• Poles: 3-Pole
• Voltage: 600 V
• Interrupting capacity: 35 kA
• Type: Plug-In
• Part number: PGA36040U43A

Who this is for: facilities and technicians performing maintenance, retrofit, or replacement work on Square D electrical systems that require a like-for-like 400 A, 3-pole, 600 V plug-in breaker. It’s especially well-suited for panelboards and enclosures that rely on quick-swap plug-in components to keep operations running smoothly.

Why it stands out: unlike generic substitutes, this breaker is specified to match Square D’s PGA series form factor and electrical characteristics, ensuring compatible mounting, trip logic, and performance within your existing protection scheme. The result is consistent protection for large motors, feeders, and three-phase loads without the guesswork of cross-referencing specs.

Guidance for ordering and installation: confirm fit and ratings before purchasing. The part number is your best reference for compatibility, and using a plug-in PGA model like PGA36040U43A helps preserve coordination with upstream protection devices and downstream devices in your power distribution layout.