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NEMA 4 Enclosures & Boxes

NEMA 4 enclosures offer indoor and outdoor solutions for watertight electrical applications. Boxes meeting NEMA 4 standards ensure protection for your equipment in adverse conditions including rain, sleet and snow, as well as, splashing or hose directed water. With a wide range of sizes, from small to large, we make it easy to find the perfect NEMA 4 enclosure solution. Available materials include plastic, aluminum, steel and stainless steel.  NEMA 4 boxes come in a variety of styles including hinged, junction box, pole-mount and more.

The NEMA rating system is used in North American markets to rate the protective performance of electrical enclosures. Using a numerical scale, the NEMA system rates an enclosure’s level of protection against the ingress of harmful environmental factors like windblown dust, splashing water, corrosion and more. (See our guide to NEMA ratings to learn more.)

What Is a NEMA 4 Enclosure?

NEMA 4 is one of the most common enclosure ratings on the NEMA scale. This rating specifies several important qualities for an enclosure, including:

  • Use of a waterproof and dustproof gasket
  • Protection against weather conditions like rain, sleet and snow
  • Protection against hose-directed water
  • Protection against flying dust, fibers and access to hazardous parts

The waterproof and dustproof features make NEMA 4 enclosures suitable for outdoor use, and you’ll find them in use in all kinds of industrial, commercial and scientific applications. Note that it’s important to differentiate NEMA 4 enclosures from NEMA 4X enclosures. They’re similar in almost every respect, but NEMA 4X enclosures offer additional corrosion resistance. See all of our NEMA 4X enclosures here.

Polycase’s Selection of NEMA 4 Enclosures

We offer a variety of NEMA 4 outdoor enclosure models suitable for protecting your most sensitive electrical components. Our NEMA 4 enclosures include must-have features like:

  • Constructed from durable materials like polycarbonate, stainless steel and aluminum
  • Numerous configuration options including wall mount flanges, clear covers, built-in knockouts and hinged covers with latches
  • Powerful and easy customization through Polycase’s in-house digital printing and CNC machining services
  • UL Listed to verify compliance with NEMA standards

Browse all of our NEMA 4 enclosures here, using the tools on the sidebar to refine your search. For additional enclosure types like NEMA 12, NEMA 3R and more, see all of Polycase’s NEMA rated enclosure models. 

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  1. plastic junction box enclosure with clear lid
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    ML-57F Weatherproof NEMA Enclosure
    As low as $15.79 per unit
    Internal: 8.2" x 4.7" x 1.9"
    209 x 121 x 49 mm
    External: 8.7" x 5.2" x 2.2"
    222 x 133 x 57 mm
    Material: Polycarbonate
  2. 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
  3. large plastic enclosure for outdoor use, weatherproof & waterproof New
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    ML-92F Weatherproof NEMA Enclosure
    As low as $44.57 per unit
    Internal: 11" x 8.5" x 3.9"
    294 x 217 x 99 mm
    External: 12" x 9.0" x 4.2"
    305 x 229 x 108 mm
    Material: Polycarbonate
  4. 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
  5. ZH-121006
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    ZH-121006 Hinged Outdoor Junction Box
    As low as $54.04 per unit
    Internal: 11" x 9.6" x 6.8"
    296 x 245 x 173 mm
    External: 12" x 10" x 7.2"
    320 x 269 x 183 mm
    Material: Polycarbonate
  6. 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
  7. Polycase waterproof electrical enclosure New
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    HP-100604 Low-Profile NEMA Enclosure
    As low as $26.96 per unit
    Internal: 9.6" x 5.6" x 4.0"
    245 x 143 x 102 mm
    External: 10" x 6.2" x 4.2"
    260 x 158 x 109 mm
    Material: Polycarbonate
  8. Polycase hinged waterproof electrical enclosure New
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    HP-070504 NEMA Electrical Box
    As low as $18.86 per unit
    Internal: 6.6" x 4.6" x 4.0"
    169 x 118 x 102 mm
    External: 7.2" x 5.2" x 4.2"
    183 x 133 x 109 mm
    Material: Polycarbonate
  9. Polycase hinged waterproof electrical enclosure New
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    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
  10. Polycase hinged waterproof electrical enclosure New
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    HP-050403 Hinged Weatherproof Enclosure
    As low as $14.52 per unit
    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
  11. ZH-141204 New
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    ZH-141204 NEMA-Rated Hinged Junction Box
    As low as $62.02 per unit
    Internal: 14" x 12" x 4.8"
    356 x 305 x 122 mm
    External: 14" x 12" x 5.2"
    370 x 319 x 133 mm
    Material: Polycarbonate
  12. promo card - ex

    SURFACE MOUNTING ELECTRICAL BOXES

    Made in the USA, the HD Series offers premium protection against all weather conditions, and unwanted tampering. With hidden cover screws, and convenient surface-mounting flanges, this series is a go-to for outdoor electronics.

    SHOP NEMA RATED HD SERIES
  13. Polycase waterproof case New
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    ZQ-141204 Submersible Electrical Enclosure
    As low as $58.67 per unit
    Internal: 14" x 12" x 4.8"
    359 x 308 x 123 mm
    External: 14" x 12" x 5.2"
    370 x 319 x 133 mm
    Material: Polycarbonate
  14. Polycase NEMA rated enclosure New
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    HP-070705 IP66 Junction Box
    As low as $24.76 per unit
    Internal: 6.7" x 6.7" x 5.5"
    172 x 172 x 140 mm
    External: 7.2" x 7.2" x 5.7"
    183 x 183 x 147 mm
    Material: Polycarbonate
  15. HP-110706 New
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    HP-110706 IP66 Hinged Electrical Box
    As low as $44.45 per unit
    Internal: 10" x 6.7" x 6.0"
    273 x 171 x 152 mm
    External: 11" x 7.2" x 6.3"
    287 x 185 x 161 mm
    Material: Polycarbonate
  16. HP-130906 New
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    HP-130906 Weatherproof Electrical Box
    As low as $49.85 per unit
    Internal: 12" x 8.7" x 6.0"
    324 x 222 x 152 mm
    External: 13" x 9.2" x 6.3"
    337 x 236 x 161 mm
    Material: Polycarbonate
  17. Large waterproof box New
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    HP-151106 Waterproof Electrical Box
    As low as $61.60 per unit
    Internal: 14" x 10" x 6.0"
    374 x 273 x 152 mm
    External: 15" x 11" x 6.3"
    388 x 287 x 161 mm
    Material: Polycarbonate
  18. WC-34
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    WC-34 Outdoor Enclosure with Clear Cover
    As low as $18.73 per unit
    Internal: 7.5" x 4.3" x 2.7"
    191 x 111 x 69 mm
    External: 7.8" x 4.7" x 2.9"
    200 x 120 x 75 mm
    Material: Polycarbonate
  19. 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
  20. 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
  21. ZQ-121206
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    ZQ-121206 Electrical Junction Box
    As low as $58.21 per unit
    Internal: 11" x 11" x 6.8"
    296 x 296 x 173 mm
    External: 12" x 12" x 7.2"
    320 x 320 x 183 mm
    Material: Polycarbonate
  22. WP-37F
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    WP-37F Polycarbonate NEMA Enclosure
    As low as $15.02 per unit
    Internal: 4.3" x 4.3" x 3.3"
    111 x 111 x 84 mm
    External: 4.7" x 4.7" x 3.5"
    120 x 120 x 90 mm
    Material: Polycarbonate
  23. AN-15P Natural diecast aluminum enclosure for electronics - 5.91 x 2.52 x 1.45 inches
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    AN-15P Diecast Aluminum NEMA Enclosure
    As low as $12.68 per unit
    Internal: 5.5" x 2.1" x 1.1"
    140 x 55 x 29 mm
    External: 5.9" x 2.5" x 1.4"
    150 x 64 x 37 mm
    Material: Aluminum
  24. promo card - ex

    SURFACE MOUNTING ELECTRICAL BOXES

    Made in the USA, the HD Series offers premium protection against all weather conditions, and unwanted tampering. With hidden cover screws, and convenient surface-mounting flanges, this series is a go-to for outdoor electronics.

    SHOP NEMA RATED HD SERIES

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From simple cutouts to threaded or counterbored holes, we can machine virtually any size or shape opening.
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waterproof electrical enclosure

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