Square D HDL36040 40A 3P Circuit Breaker | AmpState

The Square D HDL36040 40A 3P Circuit Breaker is a genuine OEM protection device engineered for reliability in panelboards, load centers, and electrical distribution systems. As a trusted Square D part, it delivers precise overcurrent protection for three-phase circuits while ensuring your original BOM stays intact. Available from AmpState, this HDL36040 is the exact replacement you need to maintain system integrity and uptime.

• Amperage: 40 A
• Poles: 3-pole
• Part number: HDL36040
• Manufacturer: Square D (Schneider Electric)
• Applications: Panelboards, load centers, and general electrical distribution

Why this exact part matters: using the OEM HDL36040 ensures a precise fit, consistent trip characteristics, and seamless BOM alignment. This is especially important for replacement projects where matching original specifications minimizes retrofit risk and preserves panel labeling and electrical protection schemes. It’s a practical, ready-to-use solution for keeping critical electrical infrastructure compliant and dependable.

Ideal use cases

• Replacing a failed or tripped 40 A, 3-pole circuit in three-phase panelboards or load centers
• Stocking a reliable spare that mirrors the original equipment for quick field swaps
• Upgrading service equipment while preserving the panel’s documented protection configuration

Installation & safety notes

1. Power down the service and verify the absence of voltage before opening the panel.
2. Identify the correct breaker slot and remove the existing unit following manufacturer guidelines.
3. Install the HDL36040 so it sits firmly in the bus and snaps into place with the proper alignment.
4. Restore power and perform any required functional tests to confirm proper operation of the protection circuit.
5. Torque and installation details should align with Square D/Schneider Electric specifications and your panel’s engineering documentation.

Compatibility and support

This HDL36040 is designed to align with original Square D BOM configurations. If you’re unsure about fit for your specific panel or distribution arrangement, AmpState provides guidance to verify compatibility and ensure you’re selecting the correct OEM part. Having the exact part number on hand helps maintain documentation accuracy and reduces field uncertainty when ordering replacements.

Ideal for electricians, facilities managers, and BOM managers, the Square D HDL36040 40A 3P Circuit Breaker from AmpState combines trusted performance with practical, real-world value—delivering dependable overcurrent protection while keeping your electrical distribution aligned with the original design.