Square D HJA36045 - 45 A, 600 V, 3-Pole Plug-In Circuit Breaker | AmpState

Meet the Square D HJA36045 — a 45A, 600V, 3-pole plug-in molded case circuit breaker built to protect your electrical system with speed and precision. Engineered for dependable branch circuit overcurrent and short-circuit protection, it’s ready to stand up to demanding panelboards and load centers in a wide range of applications.

Why this 3-pole plug-in breaker matters

• Fast plug-in connection for quick installation and hassle-free replacement, minimizing downtime during panel maintenance or upgrades.
• Thermal-magnetic trip unit delivers stable, repeatable protection by combining overload (thermal) and short-circuit (magnetic) mechanisms, helping prevent nuisance trips and protecting connected equipment.
• 3-pole design supports three-phase systems, ensuring coordinated protection across all active conductors in commercial or light industrial setups.
• Broad compatibility with matching OEM load centers and panelboards means fewer fitment concerns and consistent performance with your existing infrastructure.
• Versatile applications suitable for residential, commercial, and light industrial environments, making it a dependable choice for panel upgrades, subpanels, or new installations.

Technical snapshot

• Manufacturer: Square D
• Part Number: HJA36045
• Type: Thermal-magnetic molded case circuit breaker
• Amperage Rating: 45A
• Voltage Rating: 600V
• Number of Poles: 3
• Mounting Style: Plug-in
• Application: Branch circuit overcurrent and short-circuit protection

This plug-in molded-case breaker is an ideal fit for electricians and facilities managers who value fast serviceability, reliable protection, and OEM-aligned performance. Whether you’re stocking a commercial panel, outfitting a small industrial control room, or upgrading a residential subpanel, the HJA36045 delivers predictable trip characteristics and durable operation in a compact, easy-to-install package.

Choose the Square D HJA36045 for concise, dependable protection that integrates seamlessly with your existing panelboard ecosystem. AmpState backs this unit with genuine engineering compatibility and streamlined ordering to keep your projects on schedule.