Square D 9421-31008-093-51 - 30A, Fused Disconnect Switch

The Square D 9421-31008-093-51 is a 30A fused disconnect switch engineered for demanding industrial and commercial environments where safe, reliable electrical isolation is critical. Built to support strict lockout/tagout (LOTO) procedures, it provides a dependable disconnect under load, enhancing personnel safety and protecting equipment during maintenance and service operations.

Key advantages

• 30 Amp fusion protection delivers precise current interruption at the source, helping prevent downstream damage during faults or maintenance.
• Lockout/Tagout compatibility supports compliant, safer lockout procedures, reducing the risk of accidental energization.
• Dependable disconnection under load ensures circuits can be isolated safely without unexpected re-energization, even in active systems.
• Long-term durability designed for continuous industrial use, maintaining reliable performance across demanding operating cycles.
• Trusted Square D reliability backed by a long-standing legacy of robust electrical control products.

Product at a glance

• Amperage Rating: 30 A
• Product Type: Fused Disconnect Switch
• Brand: Square D
• Model: 9421-31008-093-51

Who benefits from this fused disconnect

Facilities that require reliable isolation for motor loads, conveyors, pumps, and other mechanical systems will appreciate the clear, safe path to de-energize equipment for maintenance or inspection. It’s ideal for electrical rooms, distribution panels, and service entrances where isolation is part of daily safety routines.

Practical usage and best practices

Install in an appropriate enclosure with correct fuse configuration for 30 A circuits. Always follow the manufacturer’s wiring diagrams and integrate with existing lockout/tagout programs. Regular inspection of the fuses and disconnect mechanism helps maintain consistent performance and safety over time. For optimal operation, plan maintenance windows that align with system downtime to minimize impact on production schedules.

How this fused disconnect compares to non-fused options

Compared with non-fused disconnects, this unit adds active overcurrent protection at the point of isolation. The fused design offers both a clear safety mechanism for maintenance and immediate protection for connected equipment, simplifying fault tracing along the circuit and reducing exposure during service work.