NEMA 12 Enclosures & Boxes

NEMA 12 enclosures are designed for indoor industrial applications. Meeting a NEMA 12 rating means enclosures are suitable for protecting equipment in environments prone to flying dust, dirt and lint, as well as dripping water, coolant seepage or ingress from other non-corrosive liquids. NEMA Type 12 enclosures are available in plastic, aluminum or steel in a range of convenient styles and sizes. All NEMA enclosures from Polycase undergo testing and certification by UL for guaranteed protection.

With a variety of indoor electrical enclosures and junction boxes options to choose from, we make it easy to find the perfect NEMA 12 enclosure solution. Click Read More for additional key information on Polycase’s NEMA 12 enclosures.

Is NEMA 12 the Right NEMA Rating for My Enclosure?

NEMA 12 is one of many NEMA enclosure ratings established by the National Electrical Manufacturers Association to evaluate the degree of protection offered by an electrical enclosure. Specifying a NEMA 12 enclosure from Polycase could be an excellent choice for your application if:

  • You need an enclosure for indoor use that’s built for powerful protection in demanding applications, such as serving as a junction box in an industrial facility.
  • Your device requires more protection than a NEMA 1 or NEMA 2 enclosure can provide, but you don’t necessarily need an outdoor-rated enclosure like a NEMA 4X model.
  • You want to choose an enclosure rating that offers a wide variety of material and design options.

On the other hand, you might want to consider an enclosure with a higher rating if you expect your enclosure to encounter hazards such as submersion, corrosive substances or weather conditions like rain and sleet. See our NEMA ratings guide for more information on other enclosure types such as NEMA 4 and NEMA 6P.

Choosing a NEMA 12 Enclosure from Polycase

What are the factors to look at as you select your NEMA 12 enclosure? Here are a few things to keep in mind:

  • Materials: Our NEMA 12 enclosures are available in a huge variety of tough materials, including stainless steel, carbon steel, polycarbonate, ABS plastic and aluminum. See our enclosure material selection guide for key information on selecting an enclosure.
  • Build Quality: A NEMA 12 enclosure should be built with a waterproof and dustproof gasket to protect your device from environmental hazards, and its parts should fit tightly and precisely together. To ensure that your enclosure meets the NEMA standards you expect, Polycase provides the UL Listed data for all of our NEMA and rated models.
  • Configuration Options: Polycase offers NEMA 12 enclosures with a full range of configuration options. From built-in knockouts to molded-on wall mount flanges, our NEMA 12 enclosures offer features to suit any application.
  • Customization: We also provide robust options for customizing our NEMA 12 enclosures through Polycase’s in-house CNC machining and digital printing services. Our customization services offer quick turnarounds and robust customer support, and it’s easy to get started with an instant quote.

You’ll find our full selection of NEMA 12-rated enclosures on this page, plus tools on the left to help you sort and filter your choices. For more options suitable for indoor use, shop all of our indoor enclosures.

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  1. WC-20
    As low as $5.74 per unit
    2.28 x 2.52 x 1.38 in.
    58 x 64 x 35 mm.
    Material: Polycarbonate
  2. WC-20F
    As low as $5.48 per unit
    2.28 x 2.52 x 1.38 in.
    58 x 64 x 35 mm.
    Material: Polycarbonate
  3. ML-22F
    As low as $5.80 per unit
    2.63 x 2.63 x 1.63 in.
    67 x 67 x 41 mm.
    Material: Polycarbonate
  4. WC-31
    As low as $8.92 per unit
    3.23 x 3.15 x 2.17 in.
    82 x 80 x 55 mm.
    Material: Polycarbonate
  5. WC-31F
    As low as $9.36 per unit
    3.23 x 3.15 x 2.17 in.
    82 x 80 x 55 mm.
    Material: Polycarbonate
  6. SG-10
    As low as $13.31 per unit
    3.31 x 3.23 x 2.17 in.
    84 x 82 x 55 mm.
    Material: Polycarbonate
  7. SG-17
    As low as $14.72 per unit
    3.31 x 3.23 x 3.31 in.
    84 x 82 x 84 mm.
    Material: Polycarbonate
  8. ZH-040404
    As low as $27.91 per unit
    4.40 x 4.40 x 4.33 in.
    112 x 112 x 110 mm.
    Material: Polycarbonate
  9. ZQ-040404
    As low as $26.50 per unit
    4.40 x 4.40 x 4.33 in.
    112 x 112 x 110 mm.
    Material: Polycarbonate
  10. ML-24F
    As low as $7.99 per unit
    4.50 x 2.63 x 2.05 in.
    114 x 67 x 52 mm.
    Material: Polycarbonate
  11. ML-44F
    As low as $11.10 per unit
    4.50 x 4.50 x 2.44 in.
    114 x 114 x 62 mm.
    Material: Polycarbonate
  12. Timer Module

    Polycase Customization Services

    Minimal cost. Maximum impact.

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  13. WC-21
    As low as $8.75 per unit
    4.53 x 2.56 x 1.57 in.
    115 x 65 x 40 mm.
    Material: Polycarbonate
  14. WC-21F
    As low as $8.45 per unit
    4.53 x 2.56 x 1.57 in.
    115 x 65 x 40 mm.
    Material: Polycarbonate
  15. WC-22
    As low as $9.47 per unit
    4.53 x 2.56 x 2.17 in.
    115 x 65 x 55 mm.
    Material: Polycarbonate
  16. WC-22F
    As low as $8.84 per unit
    4.53 x 2.56 x 2.17 in.
    115 x 65 x 55 mm.
    Material: Polycarbonate
  17. WC-23
    As low as $10.98 per unit
    4.53 x 3.54 x 2.17 in.
    115 x 90 x 55 mm.
    Material: Polycarbonate
  18. WC-23F
    As low as $9.95 per unit
    4.53 x 3.54 x 2.17 in.
    115 x 90 x 55 mm.
    Material: Polycarbonate
  19. WC-28
    As low as $12.93 per unit
    4.53 x 3.54 x 3.15 in.
    115 x 90 x 80 mm.
    Material: Polycarbonate
  20. WC-28F
    As low as $11.47 per unit
    4.53 x 3.54 x 3.15 in.
    115 x 90 x 80 mm.
    Material: Polycarbonate
  21. ML-34F
    As low as $8.67 per unit
    4.53 x 3.56 x 2.25 in.
    115 x 90 x 57 mm.
    Material: Polycarbonate
  22. WC-36
    As low as $13.27 per unit
    4.72 x 4.72 x 2.36 in.
    120 x 120 x 60 mm.
    Material: Polycarbonate
  23. WC-36F
    As low as $13.93 per unit
    4.72 x 4.72 x 2.36 in.
    120 x 120 x 60 mm.
    Material: Polycarbonate
  24. Timer Module

    Polycase Customization Services

    Minimal cost. Maximum impact.

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Customization Services

CNC Machining

Receive your enclosures with the cutouts you need, so they are ready to go to work for you. 
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Digital Printing

Weatherproof and chemical-resistant ink printed directly onto the enclosure, that won't peel, bubble or scratch.
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Minimal Cost. Maximum Impact.

outdoor electrical enclosure

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