Square D HJA261251 - 125 A, 2-Pole Plug-In Circuit Breaker | AmpState

Square D HJA261251 is a 125A, 2-pole plug-in molded case circuit breaker designed to deliver dependable branch circuit overcurrent and short-circuit protection for panelboards and load centers. Built for quick, reliable protection in residential, commercial, and light industrial systems, this unit plugs into compatible Square D panels for fast service and proven performance.

• Fast plug-in connection: Streamlines installation and replacements in tight panel spaces, reducing downtime and wiring complexity.
• Thermal-magnetic trip unit: Offers stable, repeatable protection by responding quickly to short circuits while balancing nuisance protection during overloads.
• OEM-compatible design: Specifically engineered to work with matching Square D load centers and panelboards, ensuring coordinated performance and straightforward upgrades.
• Versatile, commercial-ready protection: Ideal for residential, commercial, and light industrial applications where reliable protection of branch circuits is essential.
• Rugged plug-in molded case: Compact, durable construction built for panel installation and easy future maintenance or expansion.

Technical specifications

• Manufacturer: Square D
• Part Number: HJA261251
• Type: Thermal-magnetic molded case circuit breaker
• Amperage Rating: 125A
• Number of Poles: 2
• Mounting Style: Plug-in
• Application: Branch circuit overcurrent and short-circuit protection

Ideal use cases

• Upgrading existing residential panels that require robust 125A protection for main or branch circuits
• Protecting commercial storefronts, offices, and service rooms with reliable, code-compliant overcurrent protection
• Replacing aging breakers in light industrial panelboards to minimize downtime with a drop-in plug-in solution
• Configuring panel layouts where quick maintenance and safe, straightforward replacement are priorities

The 2-pole configuration safeguards both hot conductors simultaneously, guarding against dangerous faults and ensuring balanced protection across circuits. The thermal-magnetic mechanism delivers precise tripping behavior—short circuits trigger rapid disconnection, while gradual overloads receive measured protection — helping protect wiring, devices, and occupants. When paired with matching OEM load centers, it supports coordinated protection and simpler future service or expansion.

Designed to fit seamlessly into panel environments and trusted by installers for reliable field performance, this plug-in breaker from Square D (available through AmpState) provides a practical, long-term solution for maintaining electrical system integrity in a variety of applications.