Square D HLL36040 - 40 A, 600 V, 3-Pole Circuit Breaker | AmpState

Designed for dependable branch circuit protection, the Square D HLL36040 40A, 600V, 3-pole molded case circuit breaker delivers reliable overcurrent and short-circuit protection in panelboards and load centers. This 3-pole unit from Square D is built for durability in residential, commercial, and light industrial settings, combining space efficiency with precise protection performance.

Key advantages that set it apart

• Compact, space-saving design: The molded case format fits tighter panel layouts, freeing space for additional circuits in your panelboard or load center.
• Thermal-magnetic trip for reliable protection: The combination of thermal overload sensing and instantaneous magnetic trip ensures stable, repeatable protection across a range of loads and ambient conditions.
• 3-pole configuration for balanced protection: Ideal for 3-phase feeders or 3-wire systems, helping protect motors and equipment from uneven load conditions.
• OEM-compatible: Designed for seamless integration with matching Square D OEM load centers and panelboards, ensuring dependable fit and performance.
• End-to-end protection at 600V: Rated for up to 600V, making it suitable for commercial and light industrial circuits while meeting industry safety standards.

Technical snapshot

• Manufacturer: Square D (Schneider Electric)
• Part Number: HLL36040
• Type: Thermal-magnetic molded case circuit breaker
• Amperage Rating: 40A
• Voltage Rating: 600V
• Poles: 3
• Application: Branch circuit overcurrent and short-circuit protection

Perfectly suited for

• Three-phase feeders in small to mid-size commercial installations, such as storefronts, offices, and service rooms.
• Motor and equipment protection for light industrial applications, including HVAC controls and conveyor systems.
• Residential and commercial panelboards where space efficiency matters and reliable short-circuit protection is required.
• Any panel that requires a compatible, OEM-grade 3-pole breaker with a clear 40A rating and 600V capability.

Installation and compatibility tips

To ensure optimal performance, pair the HLL36040 with matching Square D OEM load centers and panelboards. Verify that your system voltage aligns with the 600V rating and that a 40A protection level matches your circuit requirements. Follow standard electrical safety practices during installation, and refer to the panelboard manufacturer’s torque specs for terminal connections to maintain reliable protection characteristics over time.

What problems does it solve?

This 3-pole molded case breaker provides a reliable, repeatable safeguard against overloads and short circuits for three-phase or three-wire configurations. By combining a compact form with a robust thermal-magnetic trip, it reduces nuisance trips in varying temperatures and load conditions while ensuring critical equipment—like motors and control circuits—receives timely, coordinated protection within compliant 600V systems.

Available through AmpState, the Square D HLL36040 stands out for panel-space efficiency, precise protection, and OEM-grade compatibility—delivering a dependable solution for electricians and facility managers who demand consistent performance in diverse environments.