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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. AN-11F Natural diecast aluminum enclosure with flanges for wall mounting - 1.97 x 1.77 x 1.12 inches
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    AN-11F Diecast Aluminum NEMA Enclosure
    As low as $13.63 per unit
    Internal: 1.7" x 1.5" x 0.9"
    43 x 38 x 25 mm
    External: 1.9" x 1.7" x 1.1"
    50 x 45 x 28 mm
    Material: Aluminum
  2. AN-11P Natural diecast aluminum enclosure for electronics - 1.97 x 1.77 x 1.12 inches
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    AN-11P Diecast Aluminum NEMA Enclosure
    As low as $5.91 per unit
    Internal: 1.7" x 1.5" x 0.9"
    43 x 38 x 25 mm
    External: 1.9" x 1.7" x 1.1"
    50 x 45 x 28 mm
    Material: Aluminum
  3. AN-18F Natural diecast aluminum enclosure with flanges for wall mounting - 2.19 x 1.61 x 1.22 inches
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    AN-18F Diecast Aluminum NEMA Enclosure
    As low as $13.72 per unit
    Internal: 1.8" x 1.3" x 1.0"
    46 x 33 x 27 mm
    External: 2.1" x 1.6" x 1.2"
    56 x 41 x 31 mm
    Material: Aluminum
  4. AN-18P Natural diecast aluminum enclosure for electronics - 2.19 x 1.61 x 1.22 inches
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    AN-18P Diecast Aluminum NEMA Enclosure
    As low as $6.17 per unit
    Internal: 1.8" x 1.3" x 1.0"
    46 x 33 x 27 mm
    External: 2.1" x 1.6" x 1.2"
    56 x 41 x 31 mm
    Material: Aluminum
  5. WA-20
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    WA-20 ABS Indoor NEMA Enclosure
    As low as $4.66 per unit
    Internal: 1.9" x 2.2" x 1.1"
    50 x 56 x 30 mm
    External: 2.2" x 2.5" x 1.3"
    58 x 64 x 35 mm
    Material: ABS
  6. WA-20F
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    WA-20F ABS Indoor NEMA Enclosure
    As low as $4.66 per unit
    Internal: 1.9" x 2.2" x 1.1"
    50 x 56 x 30 mm
    External: 2.2" x 2.5" x 1.3"
    58 x 64 x 35 mm
    Material: ABS
  7. WC-20
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    WC-20 Outdoor Enclosure with Clear Cover
    As low as $5.74 per unit
    Internal: 1.9" x 2.2" x 1.1"
    50 x 56 x 30 mm
    External: 2.2" x 2.5" x 1.3"
    58 x 64 x 35 mm
    Material: Polycarbonate
  8. WC-20F
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    WC-20F Outdoor Enclosure with Clear Cover
    As low as $5.48 per unit
    Internal: 1.9" x 2.2" x 1.1"
    50 x 56 x 30 mm
    External: 2.2" x 2.5" x 1.3"
    58 x 64 x 35 mm
    Material: Polycarbonate
  9. WP-20
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    WP-20 Polycarbonate NEMA Enclosure
    As low as $5.59 per unit
    Internal: 1.9" x 2.2" x 1.1"
    50 x 56 x 30 mm
    External: 2.2" x 2.5" x 1.3"
    58 x 64 x 35 mm
    Material: Polycarbonate
  10. WP-20F
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    WP-20F Polycarbonate NEMA Enclosure
    As low as $5.21 per unit
    Internal: 1.9" x 2.2" x 1.1"
    50 x 56 x 30 mm
    External: 2.2" x 2.5" x 1.3"
    58 x 64 x 35 mm
    Material: Polycarbonate
  11. AN-01F Natural diecast aluminum enclosure with flanges for wall mounting - 2.52 x 2.28 x 1.38 inches
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    AN-01F Diecast Aluminum NEMA Enclosure
    As low as $6.25 per unit
    Internal: 2.1" x 1.8" x 1.2"
    54 x 47 x 30 mm
    External: 2.5" x 2.2" x 1.3"
    64 x 58 x 35 mm
    Material: Aluminum
  12. Timer Module

    CNC Machining & Graphics

    Save time and money with Polycase customization services

    Learn More
  13. AN-01P Natural diecast aluminum enclosure for electronics - 2.52 x 2.28 x 1.38 inches
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    AN-01P Diecast Aluminum NEMA Enclosure
    As low as $5.91 per unit
    Internal: 2.1" x 1.8" x 1.2"
    54 x 47 x 30 mm
    External: 2.5" x 2.2" x 1.3"
    64 x 58 x 35 mm
    Material: Aluminum
  14. Small black plastic waterproof enclosure
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    HD-22F NEMA Polycarbonate Enclosure
    As low as $3.88 per unit
    Internal: 2.1" x 2.1" x 1.3"
    55 x 55 x 34 mm
    External: 2.6" x 2.6" x 1.6"
    67 x 67 x 41 mm
    Material: Polycarbonate
  15. ML-22F*15 Gray outdoor waterproof enclosure rated NEMA 4x and NEMA 6P - 2.63 x 2.63 x 1.63 inches
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    ML-22F Outdoor NEMA Enclosure
    As low as $5.80 per unit
    Internal: 2.2" x 2.2" x 1.3"
    58 x 58 x 35 mm
    External: 2.6" x 2.6" x 1.6"
    67 x 67 x 41 mm
    Material: Polycarbonate
  16. AN-19F Natural diecast aluminum enclosure with flanges for wall mounting - 3.13 x 2.93 x 2.05 inches
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    AN-19F Diecast Aluminum NEMA Enclosure
    As low as $18.49 per unit
    Internal: 2.7" x 2.5" x 1.9"
    69 x 64 x 49 mm
    External: 3.1" x 2.9" x 2.0"
    80 x 74 x 52 mm
    Material: Aluminum
  17. AN-19P Natural diecast aluminum enclosure for electronics - 3.13 x 2.93 x 2.05 inches
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    AN-19P Diecast Aluminum NEMA Enclosure
    As low as $10.49 per unit
    Internal: 2.7" x 2.5" x 1.9"
    69 x 64 x 49 mm
    External: 3.1" x 2.9" x 2.0"
    80 x 74 x 52 mm
    Material: Aluminum
  18. WA-31
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    WA-31 ABS Indoor NEMA Enclosure
    As low as $6.32 per unit
    Internal: 2.9" x 2.8" x 1.9"
    74 x 72 x 49 mm
    External: 3.2" x 3.1" x 2.1"
    82 x 80 x 55 mm
    Material: ABS
  19. WA-31F
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    WA-31F ABS Indoor NEMA Enclosure
    As low as $6.92 per unit
    Internal: 2.9" x 2.8" x 1.9"
    74 x 72 x 49 mm
    External: 3.2" x 3.1" x 2.1"
    82 x 80 x 55 mm
    Material: ABS
  20. WC-31
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    WC-31 Outdoor Enclosure with Clear Cover
    As low as $8.92 per unit
    Internal: 2.9" x 2.8" x 1.9"
    74 x 72 x 49 mm
    External: 3.2" x 3.1" x 2.1"
    82 x 80 x 55 mm
    Material: Polycarbonate
  21. WC-31F
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    WC-31F Outdoor Enclosure with Clear Cover
    As low as $9.36 per unit
    Internal: 2.9" x 2.8" x 1.9"
    74 x 72 x 49 mm
    External: 3.2" x 3.1" x 2.1"
    82 x 80 x 55 mm
    Material: Polycarbonate
  22. WP-31
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    WP-31 Polycarbonate NEMA Enclosure
    As low as $8.92 per unit
    Internal: 2.9" x 2.8" x 1.9"
    74 x 72 x 49 mm
    External: 3.2" x 3.1" x 2.1"
    82 x 80 x 55 mm
    Material: Polycarbonate
  23. WP-31F
    Add to Compare Add to Wish List
    WP-31F Polycarbonate NEMA Enclosure
    As low as $9.36 per unit
    Internal: 2.9" x 2.8" x 1.9"
    74 x 72 x 49 mm
    External: 3.2" x 3.1" x 2.1"
    82 x 80 x 55 mm
    Material: Polycarbonate
  24. Timer Module

    CNC Machining & Graphics

    Save time and money with Polycase customization services

    Learn More

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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.

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outdoor electrical enclosure

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