Square D HJA36125SL 125A 3-Pole 600 V Circuit Breaker

The Square D HJA36125SL is a 125 A, 3-pole circuit breaker built to guard 3-phase electrical systems against overloads and short circuits in demanding industrial and commercial environments. With a 600 V rating and a precise HJA36125SL part number, this breaker delivers reliable protection where it matters most.

Key specifications

• Current rating: 125 A
• Poles: 3
• Voltage rating: 600 V
• Part number: HJA36125SL
• Brand: Square D

Why this 3-pole breaker stands out

• Authentic Square D engineering ensures compatibility with compatible Square D panels and bus systems, delivering consistent trip characteristics and reliable performance in three-phase circuits.
• Designed specifically for 3-phase protection, this 125 A unit is ideal for feeding large motors, compressors, conveyors, and other 3-phase equipment in industrial facilities.
• Compact, rugged construction supports repeated cycling in challenging environments while maintaining secure connections and clear labeling for easy identification.
• 600 V maximum rating expands its suitability for higher-voltage distribution networks and electrical rooms that demand robust protection.

Ideal use cases

This breaker is well-suited for:

• 3-phase motor control circuits in manufacturing, packaging lines, and material handling.
• Feeder protection for large equipment in commercial buildings or industrial plants.
• Main service disconnects in panel boards that require a reliable 125 A, 3-pole, 600 V solution.

Installation and maintenance tips

• Ensure the breaker is compatible with your Square D panel and follows the manufacturer’s mounting and torque guidelines.
• Inspect for damage before installation; replace any worn handles or labels to maintain clear identification.
• Label circuits clearly to reflect load and destination; maintain proper clearance around the panel for safe operation.

Why choose Square D HJA36125SL

When protecting critical 3-phase loads, you need a breaker you can trust. The Square D HJA36125SL combines genuine Square D reliability with precise 125 A protection for 3-pole, 600 V systems. It’s designed to reduce downtime, simplify maintenance, and fit seamlessly into compatible distribution panels—so your electrical infrastructure stays up and running when it matters most.