Square D CDK400 - 400A, Disconnect Switch

Meet the Square D CDK400, a purpose-built 400A disconnect switch designed for industrial and commercial power systems that demand safety, reliability, and easy maintenance. Built to support proper lockout/tagout (LOTO) procedures, this switch provides a clear, secure electrical isolation point when service is required, helping teams minimize risk and downtime.

Key advantages you can count on with the CDK400 include dependable disconnection under load and rugged, long-term durability. When equipment needs to be taken offline for inspection, repair, or routine maintenance, this switch delivers a clean, controlled disconnect that operators can trust—even in demanding environments.

Why the CDK400 stands out

• 400A amperage rating—capable of isolating main feeders or heavy-duty circuits in challenging installations.
• Lockout/tagout readiness—integrates smoothly with standard safety practices, keeping maintenance personnel protected.
• Reliable disconnection under load—engineered for predictable performance when it matters most.
• Durable, purpose-built construction—designed to withstand industrial environments and deliver long-term service life.
• Brand-backed reliability—the Square D name reflects engineering care, robust support, and consistent performance.

Ideal applications and scenarios

This disconnect switch is a strong fit for service entrances, main disconnects in motor control centers, distribution panels, and switchgear assemblies where a dedicated isolation point is essential. It’s well-suited for new installations and retrofit projects where safety procedures and quick, reliable disconnection are priorities.

Practical use and maintenance tips

Install the CDK400 in standard enclosures where it can be easily accessed by authorized personnel. After installation, verify the lockout/tagout provisions are functioning correctly and conduct periodic inspections of the switch mechanism to maintain optimal performance. Keep an eye on wiring connections and enclosure seals to preserve reliability in demanding conditions.

Specifications at a glance

Amperage Rating: 400A

Product Type: Disconnect Switch

Brand: Square D

Model: CDK400