Square D FH16040 A - 40 A, 277 V, 1-Pole Plug-In Circuit Breaker | AmpState

Square D FH16040A—a 40A, 277V, 1-Pole Plug-In Molded Case Circuit Breaker built for reliable branch circuit protection in panelboards and load centers. This device is engineered for fast, hassle-free replacement and dependable performance in demanding electrical environments.

Key advantages that set the FH16040A apart:

• Fast plug-in connection for quick installation and straightforward replacements, minimizing downtime during servicing or upgrades.
• Thermal-magnetic trip unit delivers stable, repeatable protection against both overloads and short circuits, helping safeguard connected equipment and wiring from damage.
• OEM-compatible design works with matching Square D load centers and panelboards, ensuring streamlined compatibility and reliable operation.
• Versatile application suitable for residential, commercial, and light industrial circuits where 277V availability is standard—ideal for lighting, receptacle, or small machinery branches.

Technical specifications

• Manufacturer: Square D
• Part Number: FH16040A
• Type: Thermal-magnetic molded case circuit breaker
• Amperage Rating: 40A
• Voltage Rating: 277V
• Number of Poles: 1
• Mounting Style: Plug-in
• Application: Branch circuit overcurrent and short-circuit protection

Practical use cases

In commercial buildings with 277V electrical systems, the FH16040A is an efficient choice for protecting individual lighting branches, office circuits, or small equipment feeders. Its plug-in design reduces panel downtime during upgrades or maintenance, while the thermal-magnetic trip ensures prompt and reliable shutoff on fault conditions, curbing damage and fire risk.

Who should consider this breaker

Property managers, facilities technicians, electricians, and contractors working with Square D panels in residential, commercial, or light industrial settings will find the FH16040A a precise fit for 40A branch circuits at 277V. If you need dependable, quick-install protection that integrates seamlessly with existing Square D panelboards, this plug-in breaker is a strong match.

Tip: Verify that your panelboard is designed to accept FH-series plug-in breakers and that 277V circuits and 40A protections align with your load calculations. When replacing or upgrading, choose the FH16040A to maintain consistent protection curves and OEM compatibility across your distribution system.