Square D C400 Circuit Breaker, 400A, 3-Pole, 600V

Square D C400 Circuit Breaker—a rugged, industrial-grade protective device engineered for demanding electrical service, maintenance, and replacement projects. With a 400 A rating, a 3-pole configuration, and a 600 V capacity, this breaker is built to safeguard three-phase systems across manufacturing floors, processing lines, and heavy machinery installations.

Specifications at a glance

• Manufacturer: Square D
• Part Number: C400
• Product Type: Circuit Breaker
• Amperage: 400 A
• Poles: 3
• Voltage: 600 V

The C400 isn’t merely a protective device; it’s a reliable partner for the lifecycle of your electrical system. The 3-pole design provides true three-phase protection, enabling coordinated interruption across all phases to help minimize equipment damage and downtime in demanding environments.

Ideal for

• Industrial service upgrades and new installations in manufacturing facilities
• Maintenance replacements in mid-to-large panel boards and switchgear
• Spare parts stocking for sites with standardized 3‑phase protection needs

Why it matters

Using the Square D C400 ensures you have a dedicated, compatible solution for high-current, three-phase circuits. By aligning your selection with the part number C400 and your application requirements, you gain a precise fit, reliable operation, and streamlined maintenance planning. This approach reduces the guesswork when stocking and scheduling service across multiple panels or sites.

Compatibility and support

Notes: Verify fit by part number and application requirements. Need help matching a part number or confirming compatibility? Message us and we’ll help ensure you’re choosing the right protection for your system.

Practical tips for installation and planning

• Plan replacements during scheduled maintenance windows to minimize downtime.
• Confirm your panel or switchgear supports 600 V and 400 A ratings to ensure seamless integration.
• Maintain a standardized stock of C400 breakers to simplify logistics across facilities with similar 3‑phase protection needs.