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NEMA 4 Enclosures & Boxes

NEMA 4 enclosures are designed to protect electrical components and equipment in demanding indoor and outdoor environments where moisture and water exposure are a concern. Our enclosures meet NEMA 4 standards, providing a watertight seal that helps safeguard against rain, sleet, snow, splashing water, and hose-directed water.

Ideal for industrial, outdoor, and washdown applications, NEMA 4 rated enclosures help ensure reliable performance in harsh conditions.

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 about ratings.

Key Features of NEMA 4 Enclosures

  • Watertight protection against rain, snow, and hose-directed water
  • Suitable for both indoor and outdoor electrical applications
  • Durable construction for use in harsh environments

Available Materials

Choose the right material for your application:

  • Polycarbonate plastic – lightweight and corrosion-resistant

  • Aluminum – strong, lightweight, and naturally corrosion-resistant

  • Steel – durable and cost-effective for general use

  • Stainless steel – superior corrosion resistance for demanding environments

Styles and Configurations

Our selection of NEMA 4 enclosure boxes includes a variety of styles to meet different installation needs:

With a wide range of sizes, materials, and mounting options, it’s easy to find the right NEMA 4 enclosure from Polycase.

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  1. AN-11F-02
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    AN-11F Diecast Aluminum NEMA Enclosure
    As low as $16.36 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-02
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    AN-11P Diecast Aluminum NEMA Enclosure
    As low as $7.09 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 $16.46 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 $7.40 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 Electronic Enclosure
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    WA-20 ABS Indoor NEMA Enclosure
    As low as $5.13 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 Electronic Enclosure
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    WA-20F ABS Indoor NEMA Enclosure
    As low as $5.13 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 Electronic Enclosure
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    WC-20 Outdoor Enclosure with Clear Cover
    As low as $6.31 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 Electronic Enclosure
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    WC-20F Outdoor Enclosure with Clear Cover
    As low as $6.03 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 Electronic Enclosure
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    WP-20 Polycarbonate NEMA Enclosure
    As low as $6.15 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 Electronic Enclosure
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    WP-20F Polycarbonate NEMA Enclosure
    As low as $5.73 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 $7.50 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 $7.09 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. Polycase waterproof electrical enclosure
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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-02
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    AN-19F Diecast Aluminum NEMA Enclosure
    As low as $22.19 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 $12.59 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 Electronic Enclosure
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    WA-31 ABS Indoor NEMA Enclosure
    As low as $6.95 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 Electronic Enclosure
    Add to Compare Add to Wish List
    WA-31F ABS Indoor NEMA Enclosure
    As low as $7.61 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 Electronic Enclosure
    Add to Compare Add to Wish List
    WC-31 Outdoor Enclosure with Clear Cover
    As low as $9.81 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 Electronic Enclosure
    Add to Compare Add to Wish List
    WC-31F Outdoor Enclosure with Clear Cover
    As low as $10.30 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 Electronic Enclosure
    Add to Compare Add to Wish List
    WP-31 Polycarbonate NEMA Enclosure
    As low as $9.81 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 Electronic Enclosure
    Add to Compare Add to Wish List
    WP-31F Polycarbonate NEMA Enclosure
    As low as $10.30 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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