"Square D DU-321 General Duty Non-Fusible Safety Switch, 3-Pole, 240VAC"

Square D DU-321 General Duty Non-Fusible Safety Switch, 3-Pole, 240VAC, NEMA 1

The Square D DU-321 general duty safety switch from Schneider Electric is a non-fusible, 3-pole, 3-wire disconnect switch built for residential and light commercial applications where durability and economy are prime considerations. Rated 240VAC with a NEMA 1 enclosure, this Single Throw Safety Switch is available in Motor FLA ratings from 30A to 200A (30A, 60A, 100A, 200A), letting you match the disconnect to the connected load while keeping the same rugged non-fusible switch design and lug electrical connections across the family. It is well suited to lighting, air conditioning, and appliance loads in residential and light commercial circuits.

Key Features

• Configuration: 3-pole, 3-wire non-fusible disconnect switch for general duty applications.
• Amperage Range: Available in Motor FLA ratings of 30A, 60A, 100A, and 200A to match connected load requirements.
• Voltage Rating: Rated operational voltage (Ue) of 240V AC for residential and light commercial circuits.
• Motor Power: Rated 7.5 hp at 240V AC 60 Hz for 3-phase motors, and 3 hp at 240V AC 60 Hz for 1-phase motors.
• Wire Range: Accepts AWG 14...AWG 6 copper or AWG 12...AWG 6 aluminum conductors, with a tightening torque of 30-30 lbf.in (2.08-13.3 mm²).
• Electrical Connection: Lug-style connections for reliable field wiring.
• Operating Mechanism: Quick-make, quick-break operating mechanism for dependable switching performance.
• Enclosure Rating: NEMA 1 degree of protection for general indoor use.
• Overcurrent Protection: Provides over-current and short circuit protection as part of the disconnect assembly.

Certifications & Compliance

• UL Listed, File E2875
• NEMA 1 Enclosure Rating
• RoHS Exemption Information: Yes
• Mercury Free

Technical Specifications

• Wiring Configuration: 3-wire
• Connection Type: Lugs
• Warranty Period: 18 months
• Toxic Heavy Metal Free: Yes
• Mercury Free: Yes
• Sustainable Packaging: Yes
• Average Life Duration: 15 year(s)
• China ROHS In Scope: No
• ROHS Eur In Scope: Yes

Typical Applications

• Residential Electrical Disconnects
• Light Commercial Electrical Installations
• Lighting Circuit Disconnects
• Air Conditioning Equipment Disconnects
• Appliance Circuit Disconnects

Why Square D?

Square D safety switches from Schneider Electric are UL Listed and built with a quick-make, quick-break mechanism for dependable, code-compliant disconnect performance across the full 30A-200A Motor FLA range. With mercury-free construction, sustainable packaging, and an 18-month warranty, this general duty switch family delivers durable, economical protection for residential and light commercial electrical systems.