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. 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
  2. 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
  3. 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
  4. 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
  5. ML-45F
    As low as $11.28 per unit
    5.50 x 4.13 x 2.44 in.
    140 x 105 x 62 mm.
    Material: Polycarbonate
  6. ML-46F
    As low as $12.02 per unit
    6.13 x 4.63 x 2.44 in.
    156 x 118 x 62 mm.
    Material: Polycarbonate
  7. ZH-060404
    As low as $34.89 per unit
    6.40 x 4.40 x 4.33 in.
    163 x 112 x 110 mm.
    Material: Polycarbonate
  8. ZQ-060404
    As low as $33.12 per unit
    6.40 x 4.40 x 4.33 in.
    163 x 112 x 110 mm.
    Material: Polycarbonate
  9. ZH-060604
    As low as $39.18 per unit
    6.40 x 6.40 x 5.22 in.
    163 x 163 x 133 mm.
    Material: Polycarbonate
  10. ZQ-060604
    As low as $37.23 per unit
    6.40 x 6.40 x 5.22 in.
    163 x 163 x 133 mm.
    Material: Polycarbonate
  11. ML-36F
    As low as $11.01 per unit
    6.50 x 3.25 x 3.39 in.
    165 x 83 x 86 mm.
    Material: Polycarbonate
  12. outdoor electrical enclosure

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  13. ML-48F
    As low as $12.43 per unit
    7.61 x 4.61 x 2.26 in.
    193 x 117 x 57 mm.
    Material: Polycarbonate
  14. ML-47F
    As low as $13.81 per unit
    7.61 x 4.61 x 3.09 in.
    193 x 117 x 78 mm.
    Material: Polycarbonate
  15. ZH-080604
    As low as $42.06 per unit
    8.40 x 6.40 x 5.22 in.
    213 x 163 x 133 mm.
    Material: Polycarbonate
  16. ZQ-080604
    As low as $39.94 per unit
    8.40 x 6.40 x 5.22 in.
    213 x 163 x 133 mm.
    Material: Polycarbonate
  17. ZH-080804
    As low as $48.37 per unit
    8.40 x 8.40 x 5.22 in.
    213 x 213 x 133 mm.
    Material: Polycarbonate
  18. ZQ-080804
    As low as $45.97 per unit
    8.40 x 8.40 x 5.22 in.
    213 x 213 x 133 mm.
    Material: Polycarbonate
  19. ML-57F
    As low as $15.79 per unit
    8.74 x 5.24 x 2.26 in.
    222 x 133 x 57 mm.
    Material: Polycarbonate
  20. ML-58F
    As low as $18.04 per unit
    8.75 x 5.25 x 3.30 in.
    222 x 133 x 84 mm.
    Material: Polycarbonate
  21. ML-70F
    As low as $25.30 per unit
    10.00 x 7.00 x 4.06 in.
    254 x 178 x 103 mm.
    Material: Polycarbonate
  22. ZH-100802
    As low as $46.46 per unit
    10.40 x 8.40 x 3.72 in.
    264 x 213 x 94 mm.
    Material: Polycarbonate
  23. ZQ-100802
    As low as $44.06 per unit
    10.40 x 8.40 x 3.72 in.
    264 x 213 x 94 mm.
    Material: Polycarbonate
  24. outdoor electrical enclosure

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