Square D FHL36040 - 40 A, 600 V, 3-Pole Circuit Breaker | AmpState

Engineered for dependable protection in panelboards and load centers, the Square D FHL36040 is a compact 3-pole molded case circuit breaker rated at 40 A and up to 600 V. Built to guard branch circuits against overcurrent and short-circuit events, this device delivers reliable, repeatable protection you can trust in demanding electrical environments.

• Space-efficient molded-case design minimizes panel footprint and simplifies installation, helping you maximize space in complex panelboards.
• Thermal-magnetic trip unit provides stable, repeatable protection by responding to both overloads and instantaneous short-circuit conditions, reducing nuisance trips and enhancing safety.
• 3-pole configuration ensures simultaneous disconnection of all poles in three-phase systems, improving protection coordination and safety across your distribution network.
• 40 A at 600 V rating makes it suitable for a range of residential, commercial, and light industrial applications, from lighting and receptacle circuits to small motor controls.
• OEM-compatible designed to pair with matching Square D loadcenters and panelboards, promoting straightforward replacements and reliable performance within existing systems.
• Designed for branch circuit overcurrent and short-circuit protection, helping protect wiring, devices, and equipment while maintaining system uptime.

Technical specifications

• Manufacturer: Square D
• Part Number: FHL36040
• 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

Ideal applications and practical use

Use the FHL36040 in panelboards and loadcenters where a compact, reliable 3-pole protection device is needed for 3-phase distribution or multi-pole disruption scenarios. Its thermal-magnetic trip mechanism helps coordinate protection with other devices in the same system, reducing the risk of cascading failures during faults. Whether upgrading an aging panel or stocking a replacement for a dedicated Square D installation, this breaker integrates smoothly with compatible OEM equipment to maintain system integrity.

Practical tips for use:

• Verify panelboard compatibility with the exact Square D OEM lineup to ensure secure mounting and proper trip coordination.
• Confirm wire sizing and conduit allowances align with a 40 A rating to maintain safe conductor protection.
• Document the replacement with the part number FHL36040 to maintain clear maintenance records and future serviceability.