Square D FH36040 - 40 A, 600 V, 3-Pole Plug-In Circuit Breaker | AmpState

Meet the Square D FH36040, a 40 A, 600 V, 3-pole plug-in molded case circuit breaker designed to safeguard modern electrical systems with precision and ease. Built for dependable branch circuit overcurrent and short-circuit protection, this unit fits seamlessly into panelboards and loadcenters, making upgrades and replacements straightforward.

Why this breaker stands out

• Fast plug-in connection: designed for quick installation and hassle-free replacements in compatible OEM panelboards and loadcenters, minimizing downtime and service interruptions.
• Thermal-magnetic trip unit: delivers stable, repeatable protection across a wide range of currents and temperatures, balancing nuisance trips with strong short-circuit response.
• 3-pole, 40 A, 600 V performance: ideal for 3-phase circuits common in commercial and light industrial environments, while still suitable for residential upgrades that require robust protection.
• OEM-compatible design: engineered to match the form and function of matching Square D panelboards and other OEM loadcenters, ensuring a reliable fit and proper trip coordination.
• Versatile applications: proven protection for branch circuits in panelboards and loadcenters across residential, commercial, and light industrial settings.

What you get and how it helps

The FH36040 provides immediate, reliable overcurrent protection for critical circuits. By combining rapid plug-in installation with a thermal-magnetic trip mechanism, it reduces downtime during panel maintenance and ensures consistent protection under varying load conditions. Its 3-pole configuration supports balanced, 3-phase applications, while the 40 A rating covers a broad range of branch circuits without overspec-ing your panel.

Technical snapshot

• Manufacturer: Square D
• Part number: FH36040
• Type: Thermal-magnetic molded case circuit breaker
• Amperage rating: 40 A
• Voltage rating: 600 V
• Poles: 3
• Mounting style: Plug-in
• Application: Branch circuit overcurrent and short-circuit protection

Ideal use cases

• New installations that require quick, reliable plug-in protection in compatible panelboards
• Panel upgrades or replacements where OEM compatibility is essential for consistent operation
• Residential, commercial, and light industrial projects needing robust 3-pole circuit protection against overloads and faults

Practical tips for maximum value

• Ensure you’re installing the FH36040 in a panelboard or loadcenter that matches Square D’s plug-in design for a secure fit and proper trip function.
• When upgrading circuits, verify that the 600 V rating aligns with your system’s voltage requirements and that a 3-pole configuration matches your phase arrangement.
• Adhere to local electrical codes and follow best practices for panel maintenance. Replace damaged breakers promptly and keep spare compatible units on hand for minimizing downtime.

With the Square D FH36040, you gain a dependable, easy-to-service protective solution that aligns with OEM panel designs while delivering precise, dependable protection for a wide range of commercial and residential electrical environments.