Square D PKA36120U43 A - 1200 A, 3-Pole Plug-In Circuit Breaker | AmpState

Meet the Square D PKA36120U43A—a 1200 A, 3-pole plug-in molded case circuit breaker designed to deliver reliable branch circuit overcurrent and short-circuit protection in panelboards and loadcenters. When uptime matters, this unit’s fast plug-in connection streamlines installation and simplifies future replacements, helping you minimize downtime and service disruptions.

Why this breaker stands out

• Rapid plug-in installation: Speeds up panel work by delivering a secure, tool-free connection that seats firmly in compatible enclosures.
• Thermal-magnetic protection: A calibrated trip unit combines thermal sensing for overloads with magnetic tripping for short circuits, delivering stable, repeatable protection performance across operating conditions.
• OEM-ready compatibility: Designed to pair with matching Square D OEM loadcenters and panelboards for straightforward replacements and dependable integration.
• High-current, versatile use: Ideal for residential, commercial, and light industrial environments that require robust 1200 A protection across three phases.

Technical snapshot

• Manufacturer: Square D
• Part Number: PKA36120U43A
• Type: Thermal-magnetic molded case circuit breaker
• Amperage Rating: 1200 A
• Number of Poles: 3
• Mounting Style: Plug-in
• Application: Branch circuit overcurrent and short-circuit protection

Ideal applications and scenarios

Use this 3-pole plug-in breaker in panelboards and loadcenters that require dependable three-phase protection in high-current environments. It’s well-suited for main distribution panels in commercial spaces, electrical rooms in light industrial facilities, and larger residential setups where a dedicated 1200 A protection device is required. If you’re upgrading aging equipment or consolidating feeders, this unit provides a dependable, OEM-compatible solution that reduces compatibility headaches during replacement projects.

Installation tips and best practices

• Ensure the panelboard is rated for 1200 A and supports plug-in, 3-pole breakers of this class. Confirm that the enclosure is designed for this specific Square D model to guarantee proper fit and protection.
• Before seating the breaker, inspect bus connectors for cleanliness and any signs of wear to secure a solid plug-in connection.
• Keep essential tools and a spare breaker on hand to expedite future replacements and minimize panel downtime.
• Follow local electrical codes and manufacturer guidance during installation, maintenance, and any planned panel upgrades.

With the Square D PKA36120U43A, you gain a trusted, high-capacity protection device that keeps critical electrical systems safe while streamlining installation and maintenance workflows. Whether you're upgrading a panelboard, installing a new loadcenter, or performing routine service, this 1200 A, 3-pole plug-in breaker delivers precise protection, dependable performance, and compatibility you can rely on.