Square D BDL36040 - 40 A, 600 V, 3-Pole Circuit Breaker | AmpState

Meet the Square D BDL36040 40A, 600V, 3-pole molded case circuit breaker — a compact, dependable solution designed to shield your panelboards and loadcenters from overcurrent and short-circuit events. Built for reliable protection in residential, commercial, and light industrial settings, this unit fits seamlessly where stability and space efficiency matter most.

Key features that make a difference

• Compact molded case design: Maximizes panel space while delivering solid protection, letting you fit more circuits in tight panels.
• Thermal-magnetic trip unit: Delivers stable, repeatable protection by responding to both overloads and sudden fault currents, reducing nuisance trips and ensuring consistent performance.
• Three-pole protection: Ensures simultaneous disconnection of all three phases for balanced, reliable protection of 3‑phase equipment and motors.
• OEM-compatible compatibility: Specifically designed to work with matching Square D OEM loadcenters and panelboards, simplifying replacement and upgrade projects.
• Versatile application: Suitable for a range of environments—homes, small businesses, and light industrial setups—where dependable branch circuit protection is essential.

Technical snapshot

• Manufacturer: Square D
• Part number: BDL36040
• Type: Thermal-magnetic molded case circuit breaker
• Ampere rating: 40A
• Voltage rating: 600V
• Number of poles: 3
• Application: Branch circuit overcurrent and short-circuit protection

Why this breaker is the right choice

For projects where space, reliability, and compatibility matter, the Square D BDL36040 delivers predictable performance under real-world conditions. The thermal-magnetic mechanism responds quickly to faults while minimizing unnecessary trips during short inrush events common with motors and compressors. Its 3-pole design offers complete phase protection, which is crucial for maintaining the longevity of 3-phase equipment and ensuring safe operation in commercial and light industrial environments.

Ideal use scenarios

• New panel installations in small offices or retail spaces that require compact, dependable 3‑phase protection.
• Replacement in existing Square D loadcenters where OEM compatibility ensures a straightforward swap without compatibility concerns.
• Protection for equipment with moderate 3‑phase loads, such as HVAC drives, lighting panels, and small machines in light industrial settings.
• Upgrading a panel where a 40A branch circuit needs robust protection with reliable tripping characteristics.

Installation and compatibility tips

• Verify that your panelboard or loadcenter is rated for 600V systems and supports 3-pole breakers of the same family for best results.
• Choose the 40A rating when protecting circuits with motors, transformers, or other equipment susceptible to inrush that benefits from a thermal-magnetic trip.
• When replacing an old breaker, match the line/load orientation and ensure the replacement is the exact part number family (BDL series) to preserve compatibility.
• Handle with the panel carefully during replacement to maintain proper alignment and secure mounting hardware for reliable operation.

With the Square D BDL36040 from AmpState, you’re selecting a trusted, purpose-built solution for protecting your 3‑phase circuits. It combines space efficiency, dependable trip performance, and OEM compatibility into one compact package—helping you keep panels organized, safer, and easier to maintain.