Square D D321NRB 30A 3P 240V Safety Switch, NEMA 3R, Fusible | AmpState

The Square D D321NRB 30A 3P 240V Safety Switch is your go-to solution for reliable equipment disconnect and isolation right at the point of use. Built for maintenance teams, panel builders, and inventory planners who value a precise part-number match, this fusible switch combines robust protection with straightforward serviceability.

Key benefits you’ll notice in daily operations:

• Clear isolation at the point of use: Quickly disconnect power to motors, pumps, conveyors, and other 3-phase equipment for safe maintenance and servicing.
• NEMA 3R rated enclosure: Weather-resistant protection that stands up to outdoor or damp environments, reducing exposure while you work.
• Fusible protection: The fusible design offers tailored overload protection—use with compatible fuses to match your system’s protection strategy and coordination needs.
• Compact 3-pole, 240V configuration: 30 amps in a 3P layout fits common 240V industrial circuits, making it a practical drop-in for many control panels and machine disconnects.
• Direct part-number match: Designed to align with Square D’s D321NRB family, streamlining sourcing, replacements, and spare inventory management.

Technical snapshot

• Manufacturer: Square D
• Part number: D321NRB
• Type: Safety Switch, Fusible
• Amperage: 30 A
• Poles: 3
• Voltage: 240 V
• Enclosure: NEMA 3R
• Applications: Equipment disconnect and isolation at the point of use

Ideal applications and scenarios

• Industrial and commercial equipment where a hard disconnect is required for safety during maintenance.
• Panel builders configuring control panels that demand a fusible, code-compliant disconnect in a weather-resistant enclosure.
• Outdoor or semi-exposed machinery such as pumps, fans, compressors, and HVAC gear that benefits from NEMA 3R protection.
• Spare inventory with a guaranteed part-number match to simplify stocking and reordering processes.

Why choose this for your system?

• It provides dependable, code-conscious isolation with built-in overcurrent protection options via compatible fuses, helping you tailor protection to your specific equipment and duty cycle.
• The NEMA 3R enclosure extends usable life in challenging environments, reducing downtime caused by weather exposure.
• Direct availability from AmpState ensures you can source confidently and confirm fit with support from specialists who know this exact part.

Need help confirming compatibility or finding the exact fuse configuration for your installation? AmpState can assist with part-number verification and fit confirmation to ensure you get a seamless, reliable safety switch that integrates with your existing gear.