Square D BJA36040 - 40 A, 600 V, 3-Pole Plug-In Circuit Breaker | AmpState

Introducing the Square D BJA36040—a 40 A, 600 V, 3-Pole Plug-In Molded Case Circuit Breaker built to deliver dependable branch circuit overcurrent and short-circuit protection in panelboards and load centers. Available from AmpState, this breaker is purpose-built to integrate seamlessly with Square D systems, offering precise protection where it matters most.

Why designers and electricians choose the Square D BJA36040

• Fast plug-in connection enables quick installation and effortless replacement, reducing downtime during maintenance or upgrades.
• Thermal-magnetic trip unit provides stable, repeatable protection performance, balancing sensitivity with reliability under varying load conditions.
• OEM compatibility is designed to work with matching Square D load centers and panelboards, ensuring proper fit, trip characteristic alignment, and predictable operation.
• Versatile application suitable for residential, commercial, and light industrial environments where robust, localized protection is essential.

Technical snapshot

• Manufacturer: Square D
• Part number: BJA36040
• Type: Thermal-magnetic molded case circuit breaker
• Amperage rating: 40 A
• Voltage rating: 600 V
• Number of poles: 3
• Mounting style: Plug-in
• Application: Branch circuit overcurrent and short-circuit protection

Practical use cases

In a three-phase panelboard or load center, the BJA36040 serves as a reliable main or feeder protection device for circuits that require a 40 A, 600 V rating. It’s ideal for:

• Residential settings that demand coordinated, easy-to-replace protection for multi-wire branch circuits
• Small commercial spaces with lighting, HVAC, or receptacle loads that benefit from rapid plug-in servicing
• Light industrial applications where consistent trip behavior and quick replacement minimize downtime

What this means for your project

Choosing the Square D BJA36040 means opting for a proven protection solution that aligns with Square D’s ecosystem. Its temperature-and-magnetic trip mechanism is tuned for predictable responses to overloads and short circuits, helping safeguard wiring, devices, and equipment while maintaining system uptime. When you need a trustworthy, code-resilient breaker that blends with OEM load centers, this 3-pole plug-in option is purpose-built for peace of mind.

Tips for optimal deployment

• Verify OEM compatibility with your Square D load center to ensure a secure plug-in connection and matched trip characteristics.
• Plan for quick replacement using the plug-in design to minimize panel downtime during maintenance or upgrades.
• Use in scenarios where three-phase protection is required and a 40 A secondary protection level aligns with downstream circuits.