Square D MD 3-Pole Motor Disco...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$312.60
Square D MD 3-Pole Motor Disconnect Switch, NEMA 4X Enclosure

Square D MD 3-Pole Motor Disconnect Switch, NEMA 4X Enclosure

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Model: MD3304X

In Stock (leaves warehouse same day if ordered before 3pm ET)

$312.60
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Square D MD 3-Pole Motor Disconnect Switch, NEMA 4X Enclosure

The Square D MD Series motor disconnect switch is a three-pole (3P) switch built in a compact NEMA 4X enclosure rated for use in NEMA 1, 3, 3R, 4, 4X, and 12 applications. This switch is available with Motor FLA ratings from 30A to 60A, giving electricians and panel builders a single reliable disconnect platform that scales to the motor load on hand. It is listed UL 508 Suitable for Motor Control (UL File E164864) and conforms to IEC standard 60947-3, making it a dependable choice for motor circuit disconnect duty across commercial and industrial equipment where dry, wet, or washdown-rated enclosure protection is required.

Key Features

  • Three-Pole Configuration: 3P switch design suited to three-phase motor disconnect applications.
  • Motor FLA Range: Available in Motor FLA ratings of 30A and 60A, so the correct switch can be matched to the connected motor load.
  • Versatile Enclosure Rating: Compact NEMA 4X enclosure suitable for NEMA 1, 3, 3R, 4, 4X, and 12 applications, supporting indoor, outdoor, and washdown environments.
  • UL 508 Listed: Listed Suitable for Motor Control under UL File E164864 for verified motor circuit disconnect performance.
  • IEC 60947-3 Compliant: Conforms to the IEC 60947-3 low-voltage switchgear and disconnector standard for global specification compatibility.
  • Horsepower Ratings: Maximum horsepower ratings of 7.5 hp at 220/240 V AC, 20 hp at 440/480 V AC, and 25 hp at 600 V AC.
  • Accessory Compatible: Works with the MDS30P accessory and MDSAN11 / MDSAN20 auxiliary contacts for expanded control functionality.

Certifications & Compliance

  • UL 508 Listed, Suitable for Motor Control (UL File E164864)
  • IEC 60947-3 Compliant
  • RoHS Eur Compliant

Technical Specifications

  • Range Of Product: MD
  • Motor FLA Options: 30A, 60A
  • Device Type: LV equipment - LV switch - disconnector
  • Warranty: 18 months
  • Toxic Heavy Metal Free: Yes
  • Mercury Free: Yes
  • Country of Origin: Tunisia

Typical Applications

  • Motor Control Centers and Industrial Machinery
  • Three-Phase Motor Disconnect Applications
  • Outdoor and Washdown Environments (NEMA 4X / NEMA 4)
  • Commercial and Industrial Electrical Installations
  • Panel Building and OEM Equipment

Why Square D?

Square D's MD Series motor disconnect switch pairs UL 508 motor control listing with IEC 60947-3 compliance in a compact, multi-rated NEMA enclosure, giving electricians, panel builders, and OEMs a dependable disconnect for demanding three-phase motor circuits across the 30A to 60A Motor FLA range. Backed by an 18-month warranty, it delivers the code-compliant performance professionals expect from Square D for industrial and commercial installations.

Manufacturer Resources

Product Specs

Product Type:
Disconnect Switch
Series:
MD
Configuration:
NEMA 4X Enclosure
Standards:
IEC 60947-3
Listing:
UL Listed
Department:
Electrical
Product Group:
Power Distribution
Amperage Rating:
30A - 60A
Product Subgroup:
Safety Switches & Disconnects

Square D MD3304X – Frequently Asked Questions

1) Will a Square D MD disconnect hold up outdoors or in a washdown area?
Yes. The MD Series motor disconnect comes in a compact NEMA 4X enclosure that is rated for NEMA 1, 3, 3R, 4, 4X and 12 applications, so one switch covers dry indoor panels, outdoor rain exposure, hosedown and dust/dripping-liquid duty. The 4X rating is the one that matters for corrosive or washdown areas like food processing and car wash equipment.
2) Which Square D MD disconnect do I order for a 10 hp 480V motor?
Go by the motor's full load amps. The MD 3-pole is offered in two Motor FLA ratings, 30A (MD3304X) and 60A (MD3604X). Maximum horsepower for the switch is 7.5 hp at 220/240 V AC, 20 hp at 440/480 V AC and 25 hp at 600 V AC, so a 10 hp 480V motor is within range as long as the nameplate FLA falls under the rating of the switch you pick.
3) Is the Square D MD switch fusible or non-fusible?
The MD is a non-fusible disconnector, catalogued as an LV switch-disconnector and listed UL 508 Suitable for Motor Control. It breaks the circuit for motor isolation and servicing; it provides no overcurrent protection, so branch circuit fusing or a breaker still has to come from upstream. If you need the disconnect and the fuses in one box, a fusible UL 98 switch such as the Bussmann CCP2-1-30CC (30A, Class CC) is the different animal, though that one is single-pole.
4) Will the Square D MD disconnect meet a spec that calls out IEC 60947-3?
It conforms to IEC 60947-3, the low voltage switchgear and disconnector standard, and it is also UL Listed under UL 508 Suitable for Motor Control, UL File E164864. That dual listing is what lets the same part go into North American panels and export machinery built to IEC specs.
5) What is the closest three-pole alternative to the Square D MD motor disconnect for a 600V circuit?
The Eaton R5 Series non-fusible three-pole rotary disconnect switch is rated 600V and, like the Square D MD, is a three-pole non-fusible disconnect. The difference is form factor and ordering: the Square D MD3304X and MD3604X arrive as a complete switch in a NEMA 4X enclosure rated for NEMA 1, 3, 3R, 4, 4X and 12 use, while the Eaton R5 rotary switch is an operator-driven rotary unit that is paired with a handle such as the Eaton R9 Series direct handle. If the job needs a washdown or outdoor enclosure out of the box, the MD in NEMA 4X covers it; if the switch is going into a builder's own panel with a through-door rotary operator, the R5 is the configuration to look at.
6) Can I use a Bussmann CCP2-1-30CC instead of a Square D MD disconnect on a three-phase motor?
No. The Bussmann CCP2-1-30CC is a single-pole 30A fusible disconnect switch using Class CC fuses and listed to UL98, so it switches one conductor only. A three-phase motor needs all three ungrounded conductors opened together, which is what the three-pole Square D MD3304X and MD3604X do; the MD is listed UL 508 suitable for motor control and conforms to IEC 60947-3. The CCP2 is the right family when you need branch-circuit fuse protection on a single-pole feed, not a three-phase motor disconnect.
7) Can I add an auxiliary contact to the Square D MD motor disconnect for control interlock?
Yes. The MD works with MDSAN11 and MDSAN20 auxiliary contacts, which is how you pick up an early-break or status contact for a control circuit or PLC input. The MDS30P accessory is also compatible. Those are ordered separately from the switch itself.
8) Is the MD a three-pole switch, and can I use it on a single-phase motor?
It is a 3-pole switch intended for three-phase motor disconnect duty. You can land a single-phase load on two of the three poles electrically, but if your application is genuinely single-phase and 30A, a single-pole fusible unit like the Bussmann CCP2-1-30CC is the closer match to what you need.
9) Is the Square D MD disconnect RoHS compliant for a spec that restricts heavy metals?
Yes, it is RoHS Eur compliant, mercury free and free of toxic heavy metals. Country of origin is Tunisia, which is often what procurement needs for documentation.
How fast can I get the Square D MD3304X delivered?
Most orders ship the same day from our distribution partners, with quick delivery throughout the continental U.S. Need it urgently? Contact Us for expedited shipping options.
Can I return it if it doesn’t work for me?
Yes—ZenSupply offers a hassle-free return policy. If the product isn’t the right fit, reach out to our support team for a return authorization or setup a return by following our return instructions.
Does the Square D MD3304X come with a warranty?
Absolutely. The Square D MD3304X is backed by a manufacturer’s warranty. For full warranty terms, check the product documentation or Contact Us.
How do I get technical support or installation help for the Square D MD3304X?
You can call, text, or email our expert support team for fast answers. We’re here to help with product selection, installation tips, and troubleshooting. Contact Us
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