NEMA 3 Enclosures

NEMA 3 boxes and enclosures protect electrical equipment in indoor and outdoor settings. Enclosures meeting NEMA Type 3 standards are designed to withstand windblown dust, rain, sleet and sometimes ice formation (depending on which version of the NEMA 3 standard they meet). Our NEMA 3 enclosures are molded from impact-resistant polycarbonate plastic and we have an array of sizes to choose from. Styles include a hinged or screw-on cover with the ability to surface mount or pole mount enclosures.

A full line of NEMA accessories is available to complete your NEMA 3 enclosure or junction box solution. Learn more about NEMA 3 enclosures below.

NEMA 3 Enclosures: Basic Facts

The National Electrical Manufacturers Association maintains the NEMA rating scale to provide information on the protective qualities of electrical enclosures. (Our complete guide to the NEMA rating system includes a full rundown of each NEMA enclosure type.) 

NEMA 3 is one of the most common ratings in enclosures designed for outdoor use. Most NEMA 3 models are built with a waterproof gasket that keeps out water and solid particulates (although some NEMA 3R enclosures aren’t). You can count on a NEMA 3 enclosure for a high degree of protection against:

  • Adverse weather including rain, snow and sleet
  • Light splashing with water
  • Falling dirt and windblown dust
  • Accidental contact with personnel

The NEMA 3 rating also has several variants with different protective characteristics, including NEMA 3R, NEMA 3S, NEMA 3X and various combinations like NEMA 3RX. For more information on these ratings, see our guide to NEMA 3 vs. NEMA 3R enclosures. 

Choosing Your NEMA 3 Enclosure 

Polycase is a go-to source for reliable outdoor enclosures designed to protect your most sensitive electrical components, with dozens of high-quality NEMA 3 rated models available. Many of our NEMA 3 enclosures also feature higher ratings that offer additional protection, such as NEMA 4X for corrosion resistance and NEMA 6P for submersion resistance. All of our NEMA enclosures are UL Listed to ensure impeccable reliability and compliance.

Our enclosures also come with a variety of features and configurations to further increase their versatility and protection. From wall mount flanges to knockouts to hinged and screw cover enclosures, you’ll find the features you’re looking for in Polycase’s NEMA 3 enclosure selection. Need something customized? Our in-house customization services offer both CNC machining and digital printing, making it incredibly simple to get an enclosure that meets your needs.

Browse all of our NEMA 3 enclosures here, or see all of our outdoor enclosures to discover additional options for your outdoor application, including stainless steel and aluminum enclosures.

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  1. 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 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 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 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 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 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 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. 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. 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-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. Internal: 4.6" x 3.6" x 3.0"
    118 x 92 x 76 mm
    External: 5.2" x 4.2" x 3.2"
    133 x 107 x 83 mm
    Material: Polycarbonate
  12. electronic enclosure with graphics

    CNC MACHINING SERVICES

    Simple to complex cutouts, reccesses and more

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  13. 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
  14. 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
  15. 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
  16. 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
  17. HP-060504 IP66 Weatherproof Box
    As low as $16.74 per unit
    Internal: 5.6" x 4.6" x 4.0"
    143 x 118 x 102 mm
    External: 6.2" x 5.2" x 4.2"
    158 x 133 x 109 mm
    Material: Polycarbonate
  18. 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
  19. 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
  20. 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
  21. 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
  22. 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
  23. 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
  24. electronic enclosure with graphics

    CNC MACHINING SERVICES

    Simple to complex cutouts, reccesses and more

    Learn More

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