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"Square D DU-321 General Duty Non-Fusible Safety Switch, 3-Pole, 240VAC"
Model: SQU-DU-321
"Square D DU-321 General Duty Non-Fusible Safety Switch, 3-Pole, 240VAC, NEMA 1The Square D DU-321 general duty safety switch from Schneider Electric is a non-fusible, 3-pole, 3-wire disconnect...
Square D
Starting at
$129.61
Square D Heavy Duty Fusible Safety Switch, 30A, 600VAC/DC, 3-Pole, NEMA 12K
The Square D Heavy Duty Fusible Safety Switch delivers dependable disconnect protection for demanding commercial and industrial circuits. Rated 30A at 600VAC/DC, this 3-pole, 20HP switch is housed in a NEMA 12K enclosure with knockouts and includes a Crouse-Hinds Arktite receptacle for an indoor dust and drip tight installation. Engineered with up to three times the durability of a standard switch, it is built for grueling operating conditions and is UL Listed for code-compliant performance.
Key Features
- Electrical Rating: 30A at 600VAC/DC for heavy duty circuit and motor disconnect applications.
- Pole Configuration: 3-pole design supports three-phase power distribution and disconnect.
- Horsepower Rating: 20HP rated, with motor power ratings scaling by voltage and phase per Square D specifications.
- NEMA 12K Enclosure: Indoor dust and drip tight enclosure with knockouts and a Crouse-Hinds Arktite receptacle.
- Fuse Compatibility: Accepts H or K and R or J class fuses, with short circuit current ratings of 10 kA (H or K) and 200 kA (R or J).
- Quick Make, Quick Break Mechanism: Red and black handle clearly indicates ON (red) and OFF (black) switch position.
- Wiring Configuration: 4-wire configuration for flexible circuit connections.
- Heavy Duty Construction: Fusible disconnect switch built for significantly higher durability than standard safety switches.
Certifications & Compliance
- UL Listed
- Mercury Free
- RoHS Compliant with Exemptions
Technical Specifications
- Warranty: 18 months
- Warranty Period: 18 months
- Sustainable Packaging: Yes
- Mercury Free: Yes
- Packaging Without Single Use Plastic: Yes
- ROHS Eur In Scope: Yes
- Serviceability: No
- With Recycled Cardboard: Yes
- China ROHS In Scope: No
- Return Indicator: Y
- Take Back: No
- Returnability: Yes
- Country of Origin: United States
Typical Applications
- Motor Disconnect and Overload Protection
- Commercial and Industrial Electrical Installations
- Panelboard and Switchgear Disconnect Applications
- Indoor Dust and Drip Tight Environments (NEMA 12K rated)
- Renovation and New Construction Electrical Upgrades
Why Square D?
Square D heavy duty fusible safety switches are engineered for reliability, combining UL Listed performance with mercury-free, RoHS-compliant construction. The quick make, quick break mechanism and NEMA 12K enclosure make this switch a trusted choice for professional electricians who need code-compliant disconnect protection in tough operating environments.
Manufacturer Resources
Product Specs
- Product Type:
- Safety Switch
- Voltage Rating:
- 600V AC / 250V DC
- Amperage Rating:
- 30A
- Configuration:
- 3-Pole
- Listing:
- UL Listed
- Standards:
- NEMA 12K
- Country Of Origin:
- United States
- Department:
- Electrical
- Product Group:
- Power Distribution
- Product Subgroup:
- Safety Switches & Disconnects
- Product Width:
- 10.5 in
- Product Height:
- 16.5 in
- Product Depth:
- 7 in
- Number Of Poles:
- Three-pole
Square D H361AWC – Frequently Asked Questions
1) What class of fuses does the Square D H361AWC 30A disconnect take, and what short circuit rating do I get?
It accepts H or K class fuses or R or J class fuses. Fuse choice sets the available fault current rating: 10 kA with H or K fuses, 200 kA with R or J. If your drawing calls for a 200 kA series rating, specify R or J class fuses when you order them, since fuses are not part of the switch.
2) Can I use this 30A Square D switch as a motor disconnect on a 3-phase circuit?
That is what it is built for. The switch is 3-pole for three-phase power, rated 30A, and carries a 20HP horsepower rating, with the usable motor HP scaling by voltage and phase. It is a fusible disconnect, so the fuses you install provide the overcurrent protection for the motor branch circuit.
3) Is the Square D H361AWC rated for 480V and 600V systems?
The voltage rating is 600V AC / 250V DC, so it covers 240V, 480V and 600V three-phase AC distribution. At 30A and 600V it suits small motor and branch disconnect duty rather than feeder sizes.
4) What is the closest equivalent to the Square D H361AWC fusible safety switch from another brand?
The ABB TC-72367 Spec-Setter is the nearest match in the heavy-duty fusible class: it is a 3-pole, 600V AC fusible safety switch like the H361AWC, which is also 3-pole at 600V AC. The difference is the enclosure - the ABB TC-72367 is a NEMA 1 enclosure, while the Square D H361AWC carries a NEMA 12K rating for indoor dust and drip tight service. If the opening is a clean indoor electrical room, NEMA 1 covers it; if there is airborne dust, washdown spray, or dripping condensate, the NEMA 12K build is the one that matches the environment.
5) Can I use a non-fusible disconnect in place of the Square D H361AWC?
Only if the circuit already has overcurrent protection ahead of the disconnect. The H361AWC is a fusible switch that accepts H or K and R or J class fuses, giving short circuit current ratings of 10 kA with H or K and 200 kA with R or J. Non-fusible options such as the Eaton DH366URK K Series switch provide the disconnecting means only, with no fuse holders inside. If the design calls for fuse protection at the motor disconnect, a non-fusible unit is not a substitute.
6) I need more than 30A - what should I use instead of the Square D H361AWC?
The H361AWC is rated 30A, so it tops out well below larger feeder loads. For a bigger heavy-duty disconnect at the same 600V, 3-pole configuration, the ABB THN3365A is a 400A 3-pole 600V heavy-duty safety switch, and the Eaton DH366URK is a 600A K Series unit in a NEMA 3R enclosure. Note that the Eaton DH366URK is non-fusible, so if you need fuse protection in the disconnect rather than upstream, that one will not carry it, and its NEMA 3R enclosure is a rainproof outdoor type rather than the indoor dust and drip tight NEMA 12K of the Square D.
7) How much wall space do I need for the Square D H361AWC safety switch?
Plan for an enclosure footprint of 16.5 inches high by 10.5 inches wide with a 7 inch depth off the wall. Add NEC-required working clearance in front of the handle, and leave room at the side for the handle swing and for conduit entry into the knockouts.
8) What does the receptacle on this Square D switch do, and do I still need to wire a load side feed?
The H361AWC includes a Crouse-Hinds Arktite receptacle, so equipment can be plugged in and disconnected at the switch rather than hard-wired. The switch is wired in a 4-wire configuration (three poles plus neutral/ground conductor path) for the supply side.
9) Is a heavy duty safety switch like this worth it over a general duty switch?
Heavy duty is the right call for industrial and commercial motor circuits, frequent switching, and rough environments; it is built for substantially higher durability than a standard switch and uses a quick make, quick break mechanism with a red ON / black OFF handle so position is unambiguous at a glance. Light commercial 240V panel work with infrequent operation is where a general duty unit fits, for example the ABB TG-Series Spec-Setter general duty fusible switch.
10) Is this Square D disconnect UL Listed for inspection on a commercial job?
Yes, the H361AWC is UL Listed. The build is also mercury free and RoHS compliant with exemptions, and the switch is made in the United States, which matters on jobs with domestic sourcing requirements.
11) Which safety switch should I pick for an outdoor or rainproof location instead of the Square D H361AWC?
The H361AWC carries a NEMA 12K rating, which is an indoor dust and drip tight enclosure and not intended for weather exposure. For an outdoor mounting location, the Eaton DH366URK K Series switch comes in a NEMA 3R enclosure, which is the rainproof type used outdoors. Confirm the amperage fits your load, since the Eaton unit is a 600A device and non-fusible, while the Square D is a 30A fusible switch.
12) Is there a cheaper general duty alternative to the Square D H361AWC heavy duty safety switch?
The ABB TG-Series Spec-Setter is a general duty fusible safety switch, versus the heavy duty construction of the Square D H361AWC. General duty switches are built for lighter-cycle residential and light commercial circuits; the H361AWC is a heavy duty unit rated 600V AC / 250V DC with a quick make, quick break mechanism intended for grueling operating conditions. For a motor disconnect in an industrial space or any 600V circuit, stay with the heavy duty switch - general duty units are not rated for that duty.
13) Is the Eaton double-throw safety switch an alternative to the Square D H361AWC?
No - it serves a different function. The Eaton DT-223UGK is a heavy-duty double-throw non-fused switch in a painted steel NEMA 1 enclosure, built to transfer a load between two sources such as utility and generator. The Square D H361AWC is a single-throw fusible disconnect, 30A, 3-pole, for isolating one circuit or motor. Specify the double-throw only when you are switching between two feeds; for a straight motor or branch disconnect with fuses, the H361AWC is the correct type.
14) What model number do I give my supplier for this Square D 30A NEMA 12K fusible switch?
The manufacturer part number is H361AWC, a Square D heavy duty fusible safety switch, 30A, 3-pole, 600V AC rated, in a NEMA 12K enclosure with the Arktite receptacle.
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reach out to our support team for a return authorization or setup a return by following our return instructions.
Does the Square D H361AWC come with a warranty?
Absolutely. The Square D H361AWC is backed by a manufacturer’s warranty.
For full warranty terms, check the product documentation or Contact Us.
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