Square D H321NDS - 30A, 240V, 3-Pole, Fused Disconnect Switch

Meet the Square D H321NDS 30A, 240V, 3-Pole Fused Disconnect Switch — a purpose-built solution for safe, reliable electrical isolation in demanding industrial and commercial environments. Crafted to support proper lockout/tagout procedures, it ensures a clean, dependable disconnection under load, helping maintenance and operations teams work more safely and efficiently.

Designed for real-world reliability, the H321NDS uses a fused disconnect design to provide immediate overcurrent protection and controlled interruption. This means you can isolate circuits with confidence, minimize arc energy, and protect downstream equipment during servicing or fault conditions. Built to endure, it delivers long-term durability that stays consistent through years of heavy use.

• Amperage rating: 30 A
• Voltage rating: 240 V
• Number of poles: 3-Pole
• Enclosure rating: NEMA 4X (weatherproof and corrosion-resistant) for rugged indoor or outdoor environments
• Product type: Fused Disconnect Switch
• Brand: Square D
• Model: H321NDS

Practical advantages in the field:

• True 3-phase isolation by simultaneously disconnecting all hot conductors, preventing partial energization during maintenance on motors, pumps, conveyors, and other heavy equipment.
• Fused protection adds a layer of safety and reliability, helping protect both personnel and downstream components during switching actions.
• NEMA 4X enclosure is designed for challenging environments—resistant to moisture, dust, and corrosive exposure—making it suitable for indoor facilities and outdoor installations alike.

Ideal applications include industrial facilities with three-phase motors and automated equipment, manufacturing lines, water treatment and processing plants, HVAC systems, and any setup requiring a rugged, code-compliant service disconnect point. The Square D H321NDS is the smart choice when safety, reliability, and durability matter as much as the disconnect itself.

To get the most from this switch, pair it with appropriate fuses and plan a convenient, secure location that aligns with lockout/tagout procedures. This ensures quick, safe isolation during maintenance while minimizing downtime and safeguarding your equipment.