Square D HJL36040 - 40 A, 600 V, 3-Pole Circuit Breaker | AmpState

The Square D HJL36040 40A, 600V, 3-pole molded case circuit breaker is engineered to deliver dependable branch circuit protection for panelboards and loadcenters. Designed to fit seamlessly into compatible Square D OEM panels, this unit balances compact size with robust performance to keep electrical systems safe and downtime minimal.

Why this 3-pole breaker stands out

• Compact molded case design saves valuable panel space, allowing easier wire routing and cleaner installations in crowded electrical enclosures.
• Thermal-magnetic trip unit provides stable, repeatable protection by combining time-delayed overload protection with instantaneous response to short circuits. This means fewer nuisance trips and quicker clearance of faults.
• 3-pole configuration is ideal for 3-phase distribution, delivering coordinated protection across all phases in commercial and light industrial settings.
• 600V voltage rating supports higher voltage applications, expanding its suitability beyond basic residential circuits to more demanding commercial uses.
• OEM-compatible design ensures reliable fit and performance when paired with matching Square D loadcenters and panelboards, reducing the risk of fitment issues during upgrades or replacements.
• 40A rated for branch circuits and equipment feeders that require solid, predictable protection without over-tripping essential loads.

Who benefits from the Square D HJL36040

electricians and maintenance teams installing or upgrading panelboards in light commercial spaces, small offices, or multifamily buildings; property managers looking for dependable, OEM-certified replacements; and contractors seeking a trusted, easily integrable protection solution for three-phase electrical networks.

Practical use cases

• Protecting three-phase lighting and small-motor loads in a commercial storefront or office building.
• Serving as a reliable branch-circuit safeguard for feeders in a light industrial panel within a workshop or manufacturing area.
• Replacement or upgrade in Square D panelboards where OEM consistency and panel compatibility are priorities.
• Part of a modular protection strategy in retrofit projects where space efficiency and ease of installation matter most.

Installation and compatibility considerations

Choose the HJL36040 when you need a trusted Square D solution that aligns with compatible OEM loadcenters and panelboards. Before installation, verify that the panelboard accepts a 3-pole molded case circuit breaker of this rating, and follow standard electrical safety practices. The thermal-magnetic trip unit will automatically manage protection for both overloads and short circuits, helping reduce equipment damage and downtime.

Technical specifications

• Manufacturer: Square D
• Part Number: HJL36040
• Type: Thermal-magnetic molded case circuit breaker
• Amperage Rating: 40A
• Voltage Rating: 600V
• Number of Poles: 3
• Application: Branch circuit overcurrent and short-circuit protection

When you choose the Square D HJL36040, you’re selecting a proven protection solution built for reliability in diverse environments—from residential panel upgrades to commercial and light industrial installations. It’s a practical, OEM-compatible choice that supports safe, efficient electrical distribution across your space.