Square D HJA36125UD 125A 3-Pole 600 V Circuit Breaker

Meet the Square D HJA36125UD 125A 3-Pole 600 V Circuit Breaker—the rugged, three‑phase protective device engineered to keep industrial and commercial power systems safe and reliable. With a 125 A rating and three poles, this breaker is purpose‑built to interrupt fault currents across three‑phase circuits up to 600 V, protecting wiring, motors, and control gear from damage and downtime.

Key benefits that matter in the field

• Precise three‑phase protection—designed for three‑phase distribution, ensuring balanced interruption across all conductors during faults.
• Genuine Square D replacement—part number HJA36125UD guarantees compatibility with Square D panels that support the HJA family, minimizing installation guesswork and downtime.
• High‑capacity, safe operation—125 A capacity provides robust protection for feeders and motor circuits while allowing convenient service and load handling.
• Flexible up to 600 V—suitable for a wide range of industrial and commercial applications where higher voltage distribution is required.

Ideal applications

Designed for three‑phase power environments, the HJA36125UD is a dependable choice for protecting motor feeders, panelboard sections, and main distribution feeders in manufacturing floors, processing plants, warehouses, and large commercial facilities. It’s well suited for equipment like conveyors, pumps, compressors, HVAC systems, and other three‑phase loads that demand reliable fault interruption.

Specifications at a glance

• Current rating: 125 A
• Poles: 3
• Voltage rating: 600 V
• Part number: HJA36125UD
• Configuration: 3‑pole circuit breaker for three‑phase protection

Why this Square D breaker stands out

• Direct compatibility with Square D panels that support HJA series MCCBs, simplifying replacements and reducing the risk of mismatches.
• Durable design for demanding environments—built to handle the rigors of industrial electrical systems while providing predictable protection performance.
• Clear, efficient protection—quickly disconnects fault currents to minimize damage and downtime, helping maintain production continuity.

Installation, safety, and best practices

• Install by a qualified electrician following the panel manufacturer’s guidelines and local electrical codes.
• Verify compatibility with your panel and bus configuration before installation to ensure a proper fit and reliable operation.
• Respect termination torque and wiring practices as specified for the HJA36125UD to ensure secure connections and consistent trip performance.
• Keep equipment labels intact and accessible for quick identification and safe maintenance planning.

For anyone updating or stocking a three‑phase distribution system, the Square D HJA36125UD 125A 3‑Pole 600 V Circuit Breaker provides targeted protection, dependable performance, and seamless integration with existing Square D infrastructure. Consider it a strategic upgrade or replacement part for robust, uninterrupted power delivery.