Square D | FI360401021 | Circuit Breaker | 40A | 3-Pole | 600V

Meet the Square D FI360401021—a purpose-built 40A, 3-pole circuit breaker designed for 600V three-phase systems. This unit is built for maintenance, retrofit, and replacement projects where exact specifications matter, delivering reliable protection for industrial power distribution.

Key specifications

• Amperage: 40A
• Poles: 3-Pole
• Voltage rating: 600V

What makes this model stand out

In a world of interchangeable parts, the FI360401021 stands apart as a genuine Square D device with a precise spec match. Using the exact part number as your reference minimizes compatibility risk when updating panels, retrofitting older installations, or replacing a failed breaker. The result is quicker sourcing, fewer installation surprises, and a smoother maintenance window for critical equipment.

Who it's for

• Facilities managers and electricians responsible for 600V three-phase distribution in manufacturing, processing, and industrial environments
• Technicians performing panel retrofit or replacement where exact part alignment is essential
• Maintenance teams aiming to standardize protective devices across equipment fleets

Use cases and practical applications

• Replacing a worn or failed three-phase breaker in industrial control panels that service motors, conveyors, or compressors
• Upgrading or restoring protection in retrofit projects where 40A, 3-pole, 600V specification is required
• Specifying exact-fit components for legacy systems to ensure consistent protection characteristics and predictable operation

Installation and compatibility tips

Before ordering, confirm fit and ratings align with your panel and distribution needs. The FI360401021 part number is the most reliable reference for compatibility, so cross-check it against the panel schedule, catalog numbers, and the device’s mounting or bus-bar arrangement. Follow standard electrical safety practices and refer to your panel manufacturer’s guidelines when performing replacements or retrofits.

Why choose this Square D breaker for your project

Choosing an exact-match part like FI360401021 minimizes installation guesswork, preserves panel coordination, and helps maintain consistent protection across your system. It’s not just a component—it’s a deliberate, spec-aligned decision that supports reliability, reduces downtime, and simplifies future service when you know the exact part to order.