Square D 9421-NC3 - 30A, Disconnect Switch

The Square D 9421-NC3 is a 30A disconnect switch designed for demanding industrial and commercial environments where safe electrical isolation is essential. Engineered for reliable performance, this disconnect switch supports proper lockout/tagout procedures and delivers clean, dependable disconnection under load, even in challenging operating conditions. With long-term durability in mind, it’s built to withstand frequent servicing and routine maintenance without compromising safety or reliability.

Key advantages that set the 9421-NC3 apart

• Amperage Rating: 30A ideal for isolating medium-power circuits and equipment
• Lockout/Tagout Ready: Designed to integrate smoothly with standard safety procedures, helping you meet compliance requirements
• Reliable Under Load: Provides stable, secure disconnection even when circuits are energized
• Durable Construction: Built to endure harsh environments and long service life in busy facilities
• Compact, Practical Form: Suitable for installation in a wide range of electrical enclosures and control panels

Practical use cases

Ideal for maintenance windows in manufacturing lines, industrial facilities, and commercial sites where routine service and safety shutdowns are necessary. Use the 9421-NC3 to isolate motors, feeders, or branch circuits during wiring upgrades, troubleshooting, or preventive maintenance, ensuring technicians can work confidently without the risk of accidental re-energization.

How it enhances safety and workflow

By delivering a clear, mechanical disconnect, this switch minimizes arcing and unintended re-energization during servicing. Pair it with standard lockout devices and tags as part of a comprehensive safety program to enforce disciplined shutdowns. The result is a safer work environment, faster maintenance cycles, and improved uptime for critical equipment.

Installation and compatibility notes

The 9421-NC3 is designed for straightforward integration into existing control panels and electrical enclosures. For best results, follow your facility’s electrical safety plan and applicable codes during installation and periodic inspections. Regular checks of the switch’s operating mechanism and enclosure integrity help preserve performance over time.

Specifications

• Amperage Rating: 30A
• Product Type: Disconnect Switch
• Brand: Square D
• Model: 9421-NC3