Square D HJA36125UH 125A 3-Pole 600 V Circuit Breaker

The Square D HJA36125UH 125A 3-Pole 600 V Circuit Breaker is a sturdy, high-capacity protector built for demanding three-phase electrical systems. With a 125-amp current rating and a 600-volt maximum, it delivers reliable short-circuit and overload protection across three hot legs, helping safeguard wiring, devices, and equipment in commercial and light industrial environments. Key specifications

• Part Number: HJA36125UH
• Current rating: 125 A
• Poles: 3
• Voltage rating: 600 V
• Manufacturer: Square D

Why this 3-pole breaker stands out

• Three-pole design provides synchronized protection for all three hot legs in a three-phase system, ensuring balanced interruption during fault events.
• 125 A capacity makes it suitable for mid-to-large branch circuits and equipment feeders without compromising safety or performance.
• 600 V rating broadens its applicability to higher-voltage panel configurations common in commercial and industrial settings.
• Part number HJA36125UH identifies a genuine Square D component, designed for compatibility with compatible Square D panels and accessories.

Ideal use cases

This circuit breaker is well-suited for three-phase distribution boards, machine and equipment feeders, and service-disconnect applications where reliable 125 A protection is required in systems operating up to 600 V. It’s a practical choice for facilities upgrading or maintaining panels that demand robust, multi-pole protection without sacrificing space inside the enclosure.

How it helps your electrical system

• Prevents damage from overloads and short circuits by interrupting fault currents promptly, helping extend the life of conductors and downstream devices.
• Ensures coordinated protection across all three phases, contributing to safer startup and operation of three-phase equipment.
• Provides a reliable, OEM-branded solution (Square D) that supports straightforward replacement and compatibility within appropriate panels.

Practical considerations

Before installation, verify that your panel or distribution board is compatible with HJA36125UH and designed to accept 3-pole 600 V devices. Follow standard electrical safety practices and installation guidelines to ensure proper fit and uninterrupted protection for your specific application.