Square D NQ/NF Type 3R Ventila...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$4,134.97
Square D NQ/NF Type 3R Ventilated Panelboard Enclosure, Steel

Square D NQ/NF Type 3R Ventilated Panelboard Enclosure, Steel

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Model: MH74D9VWP

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

$4,134.97
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Square D NQ/NF Type 3R Ventilated Panelboard Enclosure, Steel

The Square D NQ/NF Type 3R Ventilated Panelboard Enclosure is a steel enclosure box engineered to house NQ and NF panelboard interiors in commercial and industrial electrical systems. Rated NEMA Type 3R for rain-tight outdoor protection and built with a ventilated steel design, this enclosure measures 20in W x 74in H x 8.75in D, providing the space needed for a wide selection of circuit breakers, accessories, and ready-to-install panelboard components. It is suited for commercial buildings, industrial facilities, data centers, stadiums, and offices where reliable, code-compliant power distribution housing is required.

Key Features

  • Enclosure Dimensions: 20in W x 74in H x 8.75in D sized to accommodate NQ/NF panelboard interiors and accessories.
  • Durable Construction: Steel enclosure material delivers strength and long-term durability for demanding installation environments.
  • NEMA Type 3R Rating: Rain-tight design protects internal components in outdoor and exposed installations.
  • Ventilated Design: Ventilation supports airflow around installed panelboard components.
  • Modular Construction: Modular design allows for easy assembly or modification in the field.
  • Broad Enclosure Selection: Available enclosures include NEMA Type 1, 2, 3R, 4, 4X, 5, and 12 to match application requirements.
  • Accessory Compatible: Accessories and replacement parts allow design flexibility and maximize job productivity.
  • Distributor-Ready Stock: Type 1, 2, 3R/5/12 enclosures are available ready to install from distributor inventory.

Certifications & Compliance

  • NEMA Type 3R Rated (Rain-Tight/Outdoor Use)
  • RoHS EUR Compliant
  • Mercury Free
  • Toxic Heavy Metal Free

Technical Specifications

  • Enclosure Material: Steel
  • Enclosure Dimensions: 20in W x 74in H x 8.75in D
  • Country of Origin: Mexico
  • Market Segmentation: Commercial
  • Package Weight: 158.8 kg
  • Toxic Heavy Metal Free: Yes
  • Mercury Free: Yes

Typical Applications

  • Commercial Buildings
  • Industrial Buildings
  • Data Centers
  • Stadiums
  • Office Facilities
  • Panelboard and Load Center Wiring

Why Square D?

Square D backs the NQ/NF panelboard enclosure line with steel construction, NEMA Type 3R rain-tight protection, and a modular design that supports easy assembly, modification, and accessory installation. With Type 1, 2, 3R/5/12 enclosures ready to install from distributor inventory, Square D delivers dependable, code-compliant power distribution housing for demanding commercial and industrial electrical projects.

Manufacturer Resources

Product Specs

Product Type:
Panelboard Enclosure
Standards:
NEMA 3R
Configuration:
Ventilated
Country of Origin:
Mexico
Product Material:
Steel
Department:
Electrical
Product Group:
Power Distribution
Product Subgroup:
Panelboards & Load Centers

Square D MH74D9VWP – Frequently Asked Questions

1) Can the Square D MH74D9VWP panelboard enclosure be installed outdoors?
Yes. The MH74D9VWP is a NEMA Type 3R enclosure, which is the rain-tight rating used for outdoor and exposed locations. It is a steel box, and the ventilated configuration means it is intended for dry outdoor or exposed indoor use rather than washdown or hosedown areas. If the location gets sprayed down or sees corrosive chemicals, step up to a Type 4 or 4X box instead.
2) Does the Square D MH74D9VWP come with the panelboard interior and breakers?
No. This is the enclosure box only, the steel can that the panelboard mounts into. The NQ or NF interior, the trim or cover, and the breakers are all ordered separately. Plan the full bill of material as box plus interior plus trim plus breakers so the job isn't held up waiting on a missing piece.
3) What is the difference between NQ and NF panelboards, and does this box work for both?
The MH74D9VWP box is listed for both NQ and NF interiors. In the Square D line, NQ is the lighting and appliance panelboard for 240V class systems and NF is the equivalent for 480Y/277V systems. The box is the same family either way, so the voltage class decision is made by the interior you drop in, not by the can.
4) Why is this panelboard enclosure ventilated, and when should I not use a ventilated box?
The ventilation lets air move around the interior and breakers, which matters on heavily loaded panels where heat rise is a concern. The tradeoff is that a ventilated Type 3R can is not the right choice where dust, insects, or directed water are a problem. For those conditions specify a non-ventilated enclosure in Type 1, 2, 4, 4X, 5, or 12, all of which the NQ/NF enclosure line covers.
5) Is the Square D MH74D9VWP a one-man install?
No. At 20 by 74 by 8.75 inches in steel, this is a tall, heavy freestanding-height can. Plan on at least two people plus mechanical assistance to set it, and confirm the wall or structural backing can carry a steel enclosure of that size before you hang it. The modular construction does allow field assembly and modification, which helps when you are working in tight electrical rooms.
6) What is the exact part number I should put on the purchase order for this Square D 74 inch Type 3R box?
Order it as Square D MH74D9VWP. That designation carries the 74 inch box height, the D9 depth grouping, and the ventilated rainproof configuration, so it identifies the can without any additional suffix. The interior, trim, and breakers go on the order as separate line items.
7) Does this Square D enclosure meet RoHS and heavy metal restrictions for our facility spec?
The NQ/NF Type 3R ventilated enclosure is RoHS EUR compliant, mercury free, and free of toxic heavy metals. That covers most institutional and green-building submittal checklists for material content. Country of origin is Mexico, which is often the other line item procurement asks about on the same form.
How fast can I get the Square D MH74D9VWP 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 MH74D9VWP come with a warranty?
Absolutely. The Square D MH74D9VWP 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 MH74D9VWP?
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
Why buy the Square D MH74D9VWP from ZenSupply?
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