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NEMA 3R Enclosures & Boxes

NEMA 3R enclosures provide a durable solution for outdoor electrical applications. Enclosures meeting NEMA 3R ratings provide a degree of protection against falling dirt, rain, sleet, snow and external ice formation. Molded from impact-resistant polycarbonate plastic, NEMA 3R boxes come in an array of sizes — from small to large — to fit your project’s needs. 

NEMA 3R enclosures and junction boxes are commonly found in industries such as oil & gas, telecommunications, alternative energy and more. Read more below to learn about the key features of the NEMA 3R rating.

What Is a NEMA 3R Enclosure?

NEMA Type 3R is one of the most common NEMA enclosure ratings for outdoor enclosure models. Electrical enclosures with this rating provide solid protection against a variety of hazards common in outdoor environments, including adverse weather conditions. They’re popular choices for many different outdoor applications, including junction boxes, control panels and more.

The NEMA 3R rating includes two special characteristics. First, NEMA Type 3R enclosures aren’t required to have a gasket, which means that this rating alone doesn’t provide the same protection against windblown dust that other outdoor NEMA ratings do. (However, Polycase’s NEMA 3R enclosures are also built to comply with ratings higher than NEMA 3R.)

In addition, NEMA 3R enclosures must include a drainage hole that allows accumulated liquids and moisture to drain out of the enclosure. Depending on the performance rating you need, that can also make enclosure accessories such as vent plugs necessary to maintain your enclosure’s weatherproofing.

Looking for more key information on NEMA 3R electrical enclosures and their applications? See our NEMA Enclosure Ratings.

NEMA 3R Enclosures from Polycase

Polycase offers a full range of NEMA 3R enclosures for outdoor use. We make our NEMA 3R models from durable polycarbonate and offer a variety of features and configurations, including options with hinged covers, wall mount flanges and more. 

What’s more, our NEMA 3R models are designed with gaskets and other features that allow them to comply with higher ratings including NEMA 4/NEMA 4X and NEMA 6/NEMA 6P. Thus, not only do our NEMA 3R models offer protection against windblown dust, but they can also include resistance to corrosion or even submersion (depending on model).

Browse our NEMA 3R models here by using the filters on the right side to select the features you’re looking for. Or, shop our full lineup of outdoor enclosures to discover all of Polycase’s outdoor options.

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  1. 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
  2. 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
  3. ZH-040404
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    ZH-040404 Hinged NEMA Enclosure
    As low as $26.47 per unit
    Internal: 3.7" x 3.7" x 4.0"
    95 x 95 x 102 mm
    External: 4.4" x 4.4" x 4.3"
    112 x 112 x 110 mm
    Material: Polycarbonate
  4. ZQ-040404
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    ZQ-040404 Electrical Junction Box
    As low as $25.06 per unit
    Internal: 3.7" x 3.7" x 4.0"
    95 x 95 x 102 mm
    External: 4.4" x 4.4" x 4.3"
    112 x 112 x 110 mm
    Material: Polycarbonate
  5. ML-24F*1508 Gray with Clear Cover outdoor waterproof enclosure rated NEMA 4x and NEMA 6P - 4.5 x 2.63 x 2.05 inches
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    ML-24F Outdoor NEMA Enclosure
    As low as $7.99 per unit
    Internal: 4.1" x 2.2" x 1.7"
    105 x 57 x 44 mm
    External: 4.5" x 2.6" x 2.0"
    114 x 67 x 52 mm
    Material: Polycarbonate
  6. ML-44F*15 Gray outdoor waterproof box rated NEMA 4x and NEMA 6P - 4.5 x 4.5 x 2.44 inches
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    ML-44F Outdoor NEMA Enclosure
    As low as $11.10 per unit
    Internal: 4.0" x 4.0" x 2.1"
    103 x 103 x 54 mm
    External: 4.5" x 4.5" x 2.4"
    114 x 114 x 62 mm
    Material: Polycarbonate
  7. ML-34F*15 Gray outdoor waterproof enclosure rated NEMA 4x and NEMA 6P - 4.53 x 3.56 x 2.25 inches
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    ML-34F Outdoor NEMA Enclosure
    As low as $8.67 per unit
    Internal: 4.1" x 3.1" x 1.9"
    105 x 79 x 49 mm
    External: 4.5" x 3.5" x 2.2"
    115 x 90 x 57 mm
    Material: Polycarbonate
  8. IP66 rated weatherproof enclosure
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    HD-24F NEMA Polycarbonate Enclosure
    As low as $5.46 per unit
    Internal: 4.1" x 2.1" x 1.2"
    106 x 54 x 30 mm
    External: 4.6" x 2.6" x 1.6"
    118 x 67 x 41 mm
    Material: Polycarbonate
  9. black waterproof junction box with extra deep cover
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    HD-25F NEMA Polycarbonate Enclosure
    As low as $5.72 per unit
    Internal: 4.1" x 2.1" x 1.9"
    106 x 54 x 49 mm
    External: 4.6" x 2.6" x 2.3"
    118 x 67 x 60 mm
    Material: Polycarbonate
  10. HD-44FMMT Black NEMA 6P rated waterproof polycarbonate enclosure for electronics - 4.63 x 4.63 x 2.36 inches
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    HD-44F NEMA Polycarbonate Enclosure
    As low as $7.64 per unit
    Internal: 4.1" x 4.1" x 1.9"
    106 x 106 x 48 mm
    External: 4.6" x 4.6" x 2.3"
    118 x 118 x 60 mm
    Material: Polycarbonate
  11. HD-35FMMT Black NEMA 6P rated waterproof polycarbonate enclosure for electronics - 5.5 x 3.5 x 1.5 inches
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    HD-35F NEMA Polycarbonate Enclosure
    As low as $6.71 per unit
    Internal: 5.0" x 3.0" x 1.1"
    128 x 77 x 29 mm
    External: 5.5" x 3.5" x 1.5"
    140 x 89 x 38 mm
    Material: Polycarbonate
  12. outdoor electrical enclosure

    Digital Printing Services

    Apply logos, labels, infographics and more directly onto the enclosure

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  13. HD-36F Duo enclosure photo black and gray
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    HD-36F Black Waterproof Box
    As low as $7.04 per unit
    Internal: 5.0" x 3.0" x 1.8"
    128 x 77 x 48 mm
    External: 5.5" x 3.5" x 2.3"
    140 x 89 x 60 mm
    Material: Polycarbonate
  14. ML-45F*15 Gray waterproof NEMA enclosure for electronics - 5.5 x 4.13 x 2.44 inches
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    ML-45F Outdoor NEMA Enclosure
    As low as $11.28 per unit
    Internal: 5.0" x 3.6" x 2.1"
    129 x 93 x 54 mm
    External: 5.5" x 4.1" x 2.4"
    140 x 105 x 62 mm
    Material: Polycarbonate
  15. ML-46F*15 Gray outdoor NEMA 4x enclosure for electronics - 6.13 x 4.63 x 2.44 inches
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    ML-46F Outdoor NEMA Enclosure
    As low as $12.02 per unit
    Internal: 5.6" x 4.2" x 2.1"
    145 x 107 x 54 mm
    External: 6.1" x 4.6" x 2.4"
    156 x 118 x 62 mm
    Material: Polycarbonate
  16. 6x4x4 waterproof electrical enclosure
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    ZH-060404 Hinged Plastic Enclosure
    As low as $33.45 per unit
    Internal: 5.7" x 3.7" x 4.0"
    146 x 95 x 102 mm
    External: 6.4" x 4.4" x 4.3"
    163 x 112 x 110 mm
    Material: Polycarbonate
  17. ZQ-060404
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    ZQ-060404 Electrical Junction Box
    As low as $31.68 per unit
    Internal: 5.7" x 3.7" x 4.0"
    146 x 95 x 102 mm
    External: 6.4" x 4.4" x 4.3"
    163 x 112 x 110 mm
    Material: Polycarbonate
  18. 6x6x4 electrical enclosure
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    ZH-060604 Hinged Junction Box
    As low as $37.74 per unit
    Internal: 5.7" x 5.7" x 4.8"
    146 x 146 x 124 mm
    External: 6.4" x 6.4" x 5.2"
    163 x 163 x 133 mm
    Material: Polycarbonate
  19. ZQ-060604
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    ZQ-060604 Waterproof Junction Box
    As low as $35.79 per unit
    Internal: 5.7" x 5.7" x 4.8"
    146 x 146 x 124 mm
    External: 6.4" x 6.4" x 5.2"
    163 x 163 x 133 mm
    Material: Polycarbonate
  20. ML-36F duo image
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    ML-36F Outdoor NEMA Enclosure
    As low as $11.01 per unit
    Internal: 6.0" x 2.8" x 2.5"
    154 x 71 x 65 mm
    External: 6.5" x 3.2" x 3.3"
    165 x 83 x 86 mm
    Material: Polycarbonate
  21. Outdoor weatherproof black plastic box
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    HD-46F NEMA Polycarbonate Enclosure
    As low as $7.63 per unit
    Internal: 6.1" x 4.1" x 1.1"
    156 x 106 x 29 mm
    External: 6.6" x 4.6" x 1.6"
    168 x 119 x 41 mm
    Material: Polycarbonate
  22. HD-45 enclosures for outdoor use
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    HD-45F Black Waterproof Box
    As low as $8.02 per unit
    Internal: 6.1" x 4.1" x 1.9"
    156 x 106 x 48 mm
    External: 6.6" x 4.6" x 2.3"
    168 x 119 x 60 mm
    Material: Polycarbonate
  23. weatherproof plastic junction box NEMA and IP
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    ML-48F Weatherproof NEMA Enclosure
    As low as $12.43 per unit
    Internal: 7.1" x 4.1" x 1.9"
    181 x 105 x 49 mm
    External: 7.6" x 4.6" x 2.2"
    193 x 117 x 57 mm
    Material: Polycarbonate
  24. outdoor electrical enclosure

    Digital Printing Services

    Apply logos, labels, infographics and more directly onto the enclosure

    Learn More

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Polycase customization services for electronics enclosures.

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