Fusible, Safety Switch, General Duty, 240 V, 3PST MPN:D321N

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Brand: Square D
Part #: D321N
UPC: 785901461036
SKU
510-G2807971
Regular Price $383.22 Special Price $212.99

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Fusible, Safety Switch, General Duty, 240 V, 3PST

The SQUARE D D321N Safety Disconnect Switch is a crucial industrial electrical device designed to ensure quick and safe disconnection of power systems during routine operations or emergency situations. This general-duty switch is ideal for use in a variety of applications, including hazardous locations, and features a fusible design that reacts to overcurrent situations by melting when excessive current passes through. With its NEMA 1 enclosure and steel construction, it provides basic protection against environmental conditions, making it a reliable choice for industry professionals to ensure a safe and efficient working environment.

Top product features:

  • Interrupts the flow of electricity for equipment maintenance and emergency situations
  • Controls multiple circuits with normally open (NO) or closed (NC) contacts
  • React to overcurrent situations by melting when excessive current passes through them

Top product applications:

  • Power Systems in Industrial Settings
  • Equipment Maintenance and Emergency Shutdowns
  • High-Voltage Electrical Circuits in Hazardous Locations

The SQUARE D - D321N is a Safety Disconnect Switch, an essential industrial electrical device designed to interrupt the flow of electricity for equipment maintenance and emergency situations. This safety switch falls under the broader category of Electrical Supplies and is utilized by industry professionals to ensure power systems can be quickly disconnected, reducing the risk of electrical accidents during routine operations or unexpected events.


  • Amps AC: The switch has a current rating of 30 A, designed for operation within this range.
  • Contact Form: With a 3PST contact form, it controls multiple circuits with normally open (NO) or closed (NC) contacts.
  • Duty: It's rated for general duty use in standard applications or specific environments such as hazardous locations.
  • Electrical Connection: Uses lugs as its method of establishing an electrical circuit.
  • Enclosure Type: Comes with NEMA 1 enclosure type which is rated for certain environmental conditions such as dust, water, corrosion and external ice formation.
  • Fusible / Nonfusible: Fusible design offers an additional feature that reacts to overcurrent situations by melting when excessive current passes through it.
  • Gauge/Conductor: Can accommodate wire sizes ranging from 12 to 6 AWG (Aluminum), and 14 to 6 AWG (Copper).


  • Housing Material & Construction Material : Constructed from steel which contributes to its structural integrity and potential resistance to certain environmental conditions.
  • Mounting Style : Designed for surface mount installation.
  • NEMA Enclosure Rating : Has a NEMA Enclosure Rating of "1", providing basic protection against environmental conditions.
  • Number of Poles: Can control up to 3 circuits, with each pole representing an individual circuit.
  • Phase: Designed for three-phase electrical circuits.
  • Voltage: Rated for handling voltages up to 240 V in accordance with the manufacturer's specifications.


  • Fuse Kit (Class R): Comes with manufacturer's Class R fuse kit number DRK30 for overcurrent protection and safe disconnection from power sources.
  • For Fuse Class & For Use With : Compatible with Class H, K, R, T fuses indicating its suitability based on specific fuse requirements for optimal safety and performance.
  • Horsepower @ 240V AC : Designed to control and disconnect motors or machinery up to a maximum power output of 3 horsepower at a voltage of 240 Volts AC per manufacturer's guidelines.
  • Included Neutral Assembly : Comes with a neutral assembly which is essential for completing the circuit and allowing the safe passage of electrical current.


  • Metallic / Non-Metallic: Made from metal contributing towards its structural strength according to the product specifications.
  • Standards: Complies with UL Listed standards indicating adherence to specific safety requirements in industrial settings as per the standard guidelines.


Additional Information

  • Country of Origin: MX
  • Drop Ship Item: No
  • Blind Ship Eligible: No
  • LTL Freight Required: No
  • Lead Time: Ships in 1 days
  • Minimum Order Quantity: 1
  • Unit of Measure: EA
  • Package Length: 9.20
  • Package Width: 6.80
  • Package Height: 5.20
  • Package Weight: 4.36
Product info last updated on January 13, 2026 1:39pm UTC Category: Industrial Electrical Controls and Automation
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