Square D HJL36150U44X - 150 A, 3-Pole Circuit Breaker | AmpState

Meet dependable, space-efficient protection for your electrical distribution with the Square D HJL36150U44X. This 150 A, 3-pole molded-case circuit breaker is designed to shield panelboards and load centers from overcurrent and short circuits, keeping critical circuits reliable in everyday operations.

• Compact molded-case design frees panel space while delivering robust protection, making it easier to fit into tight enclosures and minimize heat build-up.
• Thermal-magnetic trip unit combines a stable thermal element with an instantaneous magnetic trip, providing repeatable protection under overloads and rapid disconnection during short circuits.
• 3-pole configuration ideal for three-phase systems, enabling coordinated protection for motors, controllers, and multi-wire circuits without nuisance trips.
• OEM-compatible designed to be compatible with matching Square D OEM loadcenters and panelboards, ensuring reliable integration and electrical performance.
• Versatile across applications suitable for residential, commercial, and light industrial environments where dependable branch-circuit protection is essential.

Technical essentials at a glance

Manufacturer: Square D | Part Number: HJL36150U44X

Type: Thermal-magnetic molded case circuit breaker (MCCB) | Amperage: 150 A | Poles: 3 | Application: Branch circuit overcurrent and short-circuit protection

Why this MCCB stands out

Unlike generic breakers, the HJL36150U44X is purpose-built for panel efficiency and long-term reliability. The molded-case construction provides excellent heat dissipation, which helps maintain consistent trip performance even in demanding load conditions. The thermal-magnetic protection curve is engineered to minimize nuisance trips during normal voltage fluctuations while delivering fast isolation when a fault occurs. This is especially beneficial for three-phase equipment like conveyors, compressors, pumps, and three-phase lighting systems where coordinated protection matters.

Ideal use cases

- Three-phase commercial lighting and small HVAC installations in storefronts or offices

- Light industrial equipment feeders and motor control circuits

- Residential and small commercial panels that require reliable 3-pole protection in tight spaces

Practical guidance for optimal results

Pair this breaker with compatible Square D loadcenters or panelboards to ensure seamless mechanical and electrical fit. When planning gangable layouts, the compact MCCB design helps maximize usable panel depth and reduces thermal buildup in crowded enclosures. For maintenance, rely on the precise thermal-magnetic trip behavior to diagnose intermittent overcurrent events by comparing trip timing under controlled test conditions.

With the Square D HJL36150U44X, you gain a purpose-built, space-conscious, three-pole protection solution that aligns with standard electrical practices for residential, commercial, and light industrial setups. It’s a reliable choice when you need consistent performance, straightforward integration, and peace of mind that your critical circuits stay safeguarded.