Square D HJA36125UR 125A 3-Pole 600 V Circuit Breaker

Meet the Square D HJA36125UR 125A 3-Pole 600 V Circuit Breaker—a purpose-built protection device engineered for robust three-phase systems. This unit brings reliable interruption across all three phases when faults occur, helping safeguard personnel and equipment in busy commercial and light-industrial environments.

Key specifications

• Part Number: HJA36125UR
• Current rating: 125 A
• Poles: 3
• Voltage rating: 600 V
• Brand: Square D

Why this matters

The 3-pole design ensures simultaneous disconnection of all phases, which is critical for maintaining balanced loads and preventing damage to motors, drives, and other three-phase equipment. With a 125 A capacity, this breaker is well-suited for feeders and circuits that power mid-range industrial equipment or commercial systems, delivering dependable overload protection and a clear trip response when faults arise.

Ideal for

• Electricians performing upgrades or replacements in Square D panelboards and enclosures.
• Facilities managers protecting three-phase motor circuits, pumps, conveyors, and HVAC feeders.
• Maintenance teams looking for a straightforward, standard-spec replacement within three-pole, 600 V installations.

What sets it apart

Unlike generic single- or two-pole breakers, this Square D circuit breaker is designed for true three-phase protection, ensuring coordinated shutoff across all conductors. The HJA36125UR designation signals a precise fit for compatible Square D systems, offering consistent performance and reliable interruption in demanding environments.

Usage tips

• Confirm your panel accepts three-pole 600 V protective devices of this specification before replacement or new installation.
• Use in three-phase feeder circuits where simultaneous tripping is essential to protect equipment and maintain system safety.
• Plan for future load changes by selecting a breaker that accommodates potential circuit expansion while preserving protection standards.

With the Square D HJA36125UR, you gain a dependable, industry-standard solution designed to protect 3-phase electrical systems up to 600 V. Install it where reliable, coordinated protection matters most, and keep your industrial or commercial operations running smoothly. Ready to secure your three-phase feeders with proven Square D performance? Add this 125 A, 3-pole, 600 V breaker to your setup today.