Square D HDL36040 - 40 A, 600 V, 3-Pole Circuit Breaker | AmpState

The Square D HDL36040 is a 40A, 600V, 3-pole molded case circuit breaker designed to deliver dependable branch-circuit protection in panelboards and load centers. Built for durable performance in residential, commercial, and light industrial environments, this unit uses a thermal-magnetic trip mechanism for stable, repeatable protection against overcurrent and short circuits.

Why the HDL36040 stands out

• Compact molded case design maximizes panel space while maintaining robust protection.
• Thermal-magnetic trip unit provides precise, consistent tripping behavior across varying load conditions, reducing nuisance trips while ensuring rapid response to faults.
• 3-pole, 40A, 600V rating accommodates three-phase systems and higher-voltage circuits often found in commercial and light industrial applications.
• OEM panel compatibility designed to integrate smoothly with matching Square D OEM load centers and panelboards for reliable, coordinated protection.
• Versatile application ideal for protecting branch circuits feeding motors, HVAC equipment, lighting, and other electrical loads in a variety of facilities.

Where and how you’ll use it

Use the HDL36040 to safeguard essential distribution in panelboards and load centers, particularly where a three-phase configuration and a 600V rating are required. This breaker is well-suited for commercial spaces, light industrial settings, and residential installations that demand dependable protection for multi‑wire and motor-driven circuits. Its compact form helps you optimize panel layouts without compromising protection performance.

Technical specifications at a glance

• Manufacturer: Square D
• Part number: HDL36040
• Type: Thermal-magnetic molded case circuit breaker
• Amperage rating: 40 A
• Voltage rating: 600 V
• Number of poles: 3
• Application: Branch circuit overcurrent and short-circuit protection

Installation and compatibility tips

For optimal results, pair the HDL36040 with the appropriate Square D panelboard or load center designed to accept HDL-series breakers. Verify your panel’s compatibility and ensure the breaker rating matches the circuit requirements. By choosing an OEM-compatible 3-pole 40A, 600V solution, you’ll achieve coordinated protection across the distribution system with fewer compatibility issues and streamlined servicing.

Whether upgrading an aging panel or outfitting a new installation, the Square D HDL36040 delivers reliable protection, efficient panel utilization, and a clear path toward safe, lasting electrical performance. Add it to your AmpState cart for a trusted, industry-standard solution that aligns with modern electrical codes and practices.