Square D HJA36100SA - 100 A, 600 V, 3-Pole Plug-In Circuit Breaker | AmpState

The Square D HJA36100SA is a 100 A, 600 V, 3-pole plug-in molded case circuit breaker designed for dependable branch circuit overcurrent and short-circuit protection in panelboards and load centers. Built to install quickly and restore power fast, it’s the practical choice when reliability matters in everyday electrical systems.

Key advantages you’ll notice in the field:

• Fast plug-in connection: Quick installation and effortless replacement reduce downtime during maintenance or panel upgrades, keeping projects on schedule.
• Thermal-magnetic trip unit: Delivers stable, repeatable protection by combining overload sensing with short-circuit protection, helping prevent nuisance trips and equipment damage.
• OEM-compatible design: Specifically engineered to integrate with matching OEM load centers and panelboards, ensuring correct fit, coordinated trip characteristics, and reliable performance.
• 3-pole configuration for 3-phase systems: Ideal for commercial and light industrial layouts that require evenly protected three-phase feeders alongside residential-grade panels in mixed-use settings.

What problems it solves

When your electrical distribution needs are evolving, the Square D HJA36100SA provides a proven, plug-in solution that protects against overcurrent and short circuits without the complexity of hard-wired alternatives. Its thermal-magnetic trip technology reduces downtime by minimizing incorrect trips, while the plug-in design simplifies serviceability in crowded panelboards and load centers.

Who this is for

• Electrical contractors performing panelboard upgrades or replacements in commercial spaces.
• Facilities managers overseeing light industrial electrical distribution that relies on reliable 3-pole protection.
• Residential/commercial installers needing a robust, easily serviceable three-phase protection option for compatible panelboards.

Technical snapshot

• Manufacturer: Square D
• Part Number: HJA36100SA
• Type: Thermal-magnetic molded case circuit breaker
• Amperage Rating: 100 A
• Voltage Rating: 600 V
• Number of Poles: 3
• Mounting Style: Plug-in
• Application: Branch circuit overcurrent and short-circuit protection

In practice, this breaker supports a clean, dependable protection strategy for panelboards and load centers across residential, commercial, and light industrial environments. If you’re upgrading or maintaining a three‑phase distribution system, the Square D HJA36100SA offers precise protection, straightforward service, and compatibility you can trust for years of reliable operation.