Square D HJL36030 - 30 A, 600 V, 3-Pole Circuit Breaker | AmpState

Meet the Square D HJL36030, a 30A, 600V, 3-pole molded case circuit breaker designed to shield your electrical system from overcurrent and short-circuit faults. Built for dependable protection in panelboards and load centers, this breaker combines space efficiency with precise, reliable performance.

Key benefits and features

• Compact molded case design maximizes panel space, helping you fit more circuits cleanly without crowding the enclosure.
• Thermal-magnetic trip unit delivers stable, repeatable protection across temperature variations, reducing nuisance trips while still catching dangerous faults.
• 3-pole configuration provides balanced protection for three-phase circuits, or shared-neutral setups common in commercial and light industrial installations.
• OEM compatibility designed to work with matching Square D load centers and panelboards for straightforward, drop-in replacement or modernization projects.
• 600V rated suitable for higher voltage branch circuits found in commercial and light industrial environments, offering robust protection where it matters most.

Technical specifications

• Manufacturer: Square D
• Part Number: HJL36030
• Type: Thermal-magnetic molded case circuit breaker
• Amperage Rating: 30A
• Voltage Rating: 600V
• Number of Poles: 3
• Application: Branch circuit overcurrent and short-circuit protection

Ideal applications and use cases

• Residential homes with three-phase subpanels in light commercial setups require reliable protection for multiple branches without overcrowding the panel. This 3-pole breaker fits neatly into those spaces.
• Commercial offices and small retail environments where three-phase equipment (pumps, HVAC units, lighting panels) demand dependable, quick-disconnect protection.
• Light industrial machinery and equipment enclosures that run on a robust 600V supply, offering consistent protection against overloads and faults.
• Panelboard modernization projects where compatibility with OEM load centers ensures smooth upgrades and easier maintenance scheduling.

Why choose this model and practical tips

The HJL36030 stands out for users who value panel efficiency and reliable fault protection. Its thermal-magnetic trip mechanism minimizes nuisance trips while still providing fast disconnection on true faults, giving you peace of mind in environments with fluctuating loads. Compared with bulkier or less-tuned breakers, this unit helps you maximize panel capacity without sacrificing safety.

• Ensure your panelboard is rated for 600V and that the bus stabs are compatible with this Square D HJL series.
• Use as part of a coordinated protection scheme—pair with appropriately sized conductors and properly rated fuses or breakers on adjacent circuits for balanced protection.
• Schedule routine maintenance checks to verify torque on terminations and confirm there are no signs of overheating or wear around the breaker.
• Keep a spare in your maintenance kit for quick replacements during routine servicing or fault events, reducing downtime.

Whether you’re upgrading an existing panel, configuring a new commercial space, or protecting critical three-phase loads, the Square D HJL36030 delivers reliable, space-efficient protection with a trusted brand backing. AmpState offers this essential component to help you build safer, more resilient electrical systems.