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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. 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. 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. 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. Waterproof gray plastic enclosure for outdoor use
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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-22 DUO
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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
    Add to Compare Add to Wish List
    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
    Add to Compare Add to Wish List
    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. 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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