Square D 9421-ND3 - 60A, 600V, 3-Phase, Disconnect Switch

Meet the Square D 9421-ND3—a purpose-built 60A, 600V, 3-Phase Disconnect Switch engineered for reliable motor isolation and targeted overcurrent protection in demanding industrial and commercial environments. This compact, maintainable disconnect point is designed to simplify electrical safety and serviceability without sacrificing performance.

• Model: 9421-ND3
• Amperage: 60A
• Voltage: 600V
• Phase: 3-Phase

Why this disconnect switch stands out

The 9421-ND3 is built to deliver dependable on/off isolation exactly where you need it—whether you’re protecting a motor, feeding a panelboard, or safeguarding a branch circuit. Its compact footprint makes it an ideal fit for tight electrical enclosures, service rooms, and crowded equipment spaces where space is at a premium. Beyond the rugged reliability, the design emphasizes maintainability, offering straightforward access for inspection, maintenance, and fuse replacement when required.

Ideal use cases

• Motor disconnects in equipment bays, conveyors, pumps, and fan assemblies
• Panelboards requiring a dedicated, easily accessible isolation point
• Branch circuit protection in commercial and light industrial installations
• Main or secondary disconnects in motor control centers where a compact, serviceable switch is advantageous

Benefits that matter in real-world operations

• Clear isolation for safety: A dedicated on/off point reduces the risk during maintenance and troubleshooting.
• Robust 3-phase protection: Handles three-phase loads with consistent performance across phases.
• 600V rating for versatility: Suitable for a wide range of motors and feeders in industrial environments.
• Compact, space-saving design: Fits into tight panels and electrical rooms without compromising accessibility.
• Maintenance-friendly: Designed for straightforward servicing and fuse-related maintenance when required, helping you minimize downtime.

Who's it for

Ideal for facilities needing a reliable, space-efficient disconnect for motor circuits, panelboard feeders, and branch protections. It's well-suited for electrical contractors, facilities engineers, and maintenance teams tasked with improving safety, reducing downtime, and streamlining panel layouts in factories, warehouses, and commercial operations.

Practical tips for getting the most from your 9421-ND3

• Confirm circuit wiring aligns with the 60A, 600V, 3-phase specification to ensure optimal protection and performance.
• Label line and load connections clearly to speed maintenance and reduce the chance of miswiring during servicing.
• Plan for periodic inspections of the disconnect mechanism to verify smooth operation and reliable isolation.
• If incorporating fusing options, follow manufacturer guidance for fuse type and replacement parts to maintain protection integrity.