Square D FA36040 - 40 A, 600 V, 3-Pole Plug-In Circuit Breaker | AmpState

Meet the Square D FA36040 — a 40 A, 600 V, 3-pole plug-in molded case circuit breaker designed to shield your panelboards and load centers from overcurrent and short-circuit events. Built by Square D, a trusted name in electrical protection, this unit integrates seamlessly with matching OEM panels to deliver reliable, code-compliant protection for a wide range of commercial and industrial applications while also serving residential setups with higher voltage or three-phase needs.

Key advantages you’ll notice on every installation

• Fast plug-in mounting for rapid installation and straightforward replacements, minimizing downtime during panel servicing or upgrades.
• Thermal-magnetic trip unit combines a responsive thermal element for overload protection with a magnetic element for instantaneous short-circuit protection, delivering stable, repeatable protection across diverse load profiles.
• 3-pole design suited for three-phase circuits, ideal for commercial equipment, motors, and multi-wire feeders.
• 600 V voltage rating accommodates higher-voltage branch circuits common in modern panel systems and industrial environments.
• OEM panel compatibility engineered to work with matching Square D OEM load centers and panelboards for a cohesive, compliant installation.
• 40 A amperage rating provides robust protection for medium-duty branch circuits and motor loads within its rated range.

How it protects your electrical system

The FA36040 is a thermal-magnetic molded case circuit breaker, meaning it automatically interrupts current if a circuit draws more than its rated capacity or experiences a short circuit. The thermal element continuously monitors heat buildup to prevent nuisance trips on normal operation, while the magnetic mechanism reacts instantly to high fault currents. This dual-action protection helps guard wiring insulation, downstream devices, and connected equipment from damage, prolonging system life and reducing maintenance costs.

Ideal use cases

• Commercial panelboards and load centers requiring reliable three-phase protection for lighting, outlets, and small motors.
• Light industrial distribution where higher voltage (600 V) circuits necessitate a robust, plug-in MCCB solution.
• New installations or panel replacements that specify FA36040 as the compatible protection device for three-pole, 40 A circuits.
• Retrofits and service upgrades in environments that demand quick replacement/maintenance without sacrificing protection quality.

Specifications at a glance

• Manufacturer: Square D
• Part number: FA36040
• Type: Thermal-magnetic molded case circuit breaker
• Amperage rating: 40 A
• Voltage rating: 600 V
• Number of poles: 3
• Mounting style: Plug-in
• Application: Branch circuit overcurrent and short-circuit protection

Why this FA36040 stands out from the pack

What makes this particular 3-pole plug-in breaker distinctive is its combination of a reliable thermal-magnetic trip mechanism, a compact molded-case design, and deliberate compatibility with OEM panel ecosystems. For technicians working in mixed-use facilities, the ability to pair Square D FA36040 with the corresponding load centers ensures consistent trip characteristics, predictable performance, and straightforward serviceability. The plug-in format reduces commissioning time and simplifies field replacements, helping keep electrical rooms up and running with minimal downtime.

Practical tips for installation and operation

• Verify that the panelboard model and bus configuration match the FA36040’s specifications before installation.
• Always de-energize the panel and follow lockout/tagout procedures prior to any replacement or servicing.
• When replacing an existing breaker, ensure the replacement’s amp rating and number of poles align with the circuit’s requirements and the panel’s listing.
• Store and handle breakers in a clean, dry environment to preserve contact surfaces and mechanical integrity.
• Consult your applicable electrical codes for installation clearances, torque values, and panelboard compatibility to ensure a safe, code-compliant setup.

Why AmpState is a trusted source for this part

As a distributor of genuine Square D components, AmpState ensures you receive authentic FA36040 breakers with reliable performance. Whether you’re outfitting new commercial spaces, upgrading aging panels, or stocking for field service, this unit is ready to slot into compatible OEM panels for fast, secure protection.

In short, the Square D FA36040 40 A, 600 V, 3-pole plug-in molded case circuit breaker delivers dependable three-phase protection with easy installation, durable construction, and seamless compatibility with matching panel systems. It’s the practical choice for reliable branch-circuit protection in commercial, light industrial, and select residential applications where high-voltage, multi-pole protection is required.