Square D HJA36150SD 150A 3-Pole 600 V Circuit Breaker

Meet the Square D HJA36150SD — a purpose-built 150-amp, 3-pole circuit breaker designed to protect three-phase electrical systems up to 600 V. This genuine Square D device delivers dependable overcurrent protection in demanding industrial and commercial environments, helping you safeguard motors, drives, and other heavy-duty equipment from overloads and short circuits.

• Current rating: 150 A — sturdy protection for high-load feeders and large equipment banks.
• Pole configuration: 3-pole (three-phase) for balanced protection across all phases.
• Voltage rating: Up to 600 V AC, suitable for medium-voltage distribution in professional installations.
• Part number: HJA36150SD — a genuine Square D component engineered for reliable interchange with appropriate Square D panels.

Why this breaker stands out: the three-phase design ensures synchronized tripping across all lines, reducing the risk of motor damage and unbalanced faults that can stall production. Its robust construction is built for stable performance in environments where motors, HVAC systems, conveyors, and large compressors rely on consistent, protective power.

Ideal use cases

• Protection for three-phase feeders in manufacturing facilities and warehouses.
• Protection for large motors, drives, and industrial equipment in commercial spaces.
• Replacement or upgrade within Square D panels that accept HJA-series breakers, ensuring compatibility and reliable operation.

Installation and compatibility considerations

• Install only in panels designed to accept 3-pole Square D devices of this type. Confirm panel compatibility to ensure proper bus connection and mounting.
• Verify that connected loads do not exceed the 600 V AC rating and that the circuit wiring and breakers meet local electrical codes.
• When replacing an older breaker, ensure a clean, snap-in seating and secure mounting to maintain reliable contact and trip performance.

Choose the Square D HJA36150SD when you need a proven, high-capacity protection solution that aligns with standardized Square D panel ecosystems. This breaker pairs with dependable manufacturer support and a long-standing track record in safeguarding critical electrical infrastructure, helping you minimize downtime and protect valuable equipment in everyday operations.