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In-stock orders placed after 3pm on Friday, May 26th will ship Tuesday, May 30th. Polycase will be closed Monday, May 29th in observance of Memorial Day.

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
    As low as $13.63 per unit
    1.97 x 1.77 x 1.12 in.
    50.04 x 44.96 x 28.45 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
    As low as $5.91 per unit
    1.97 x 1.77 x 1.12 in.
    50.04 x 44.96 x 28.45 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
    As low as $13.72 per unit
    2.19 x 1.61 x 1.22 in.
    55.63 x 40.89 x 30.99 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
    As low as $6.17 per unit
    2.19 x 1.61 x 1.22 in.
    55.63 x 40.89 x 30.99 mm.
    Material: Aluminum
  5. WA-20*16 Gray indoor NEMA 4x waterproof enclosure for electronics - 2.28 x 2.52 x 1.38 inches
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    WA-20
    As low as $4.66 per unit
    2.28 x 2.52 x 1.38 in.
    57.91 x 64.01 x 35.05 mm.
    Material: ABS
  6. ABS plastic junction box
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    WA-20F
    As low as $4.66 per unit
    2.28 x 2.52 x 1.38 in.
    57.91 x 64.01 x 35.05 mm.
    Material: ABS
  7. WC-20*1508 Gray with Clear Cover outdoor NEMA 4x enclosure for electronics - 2.28 x 2.52 x 1.38 inches
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    WC-20
    As low as $5.74 per unit
    2.28 x 2.52 x 1.38 in.
    57.91 x 64.01 x 35.05 mm.
    Material: Polycarbonate
  8. WC-20F
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    WC-20F
    As low as $5.48 per unit
    2.28 x 2.52 x 1.38 in.
    57.91 x 64.01 x 35.05 mm.
    Material: Polycarbonate
  9. WP-20*15 Gray outdoor NEMA 4x waterproof enclosure - 2.28 x 2.52 x 1.38 inches
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    WP-20
    As low as $5.59 per unit
    2.28 x 2.52 x 1.38 in.
    57.91 x 64.01 x 35.05 mm.
    Material: Polycarbonate
  10. WP-20F*15 Gray outdoor NEMA 4x waterproof enclosure - 2.28 x 2.52 x 1.38 inches
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    WP-20F
    As low as $5.21 per unit
    2.28 x 2.52 x 1.38 in.
    57.91 x 64.01 x 35.05 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
    As low as $6.25 per unit
    2.52 x 2.28 x 1.38 in.
    64.01 x 57.91 x 35.05 mm.
    Material: Aluminum
  12. Timer Module

    Polycase Customization Services

    Minimal cost. Maximum impact.

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  13. AN-01P Natural diecast aluminum enclosure for electronics - 2.52 x 2.28 x 1.38 inches
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    AN-01P
    As low as $5.91 per unit
    2.52 x 2.28 x 1.38 in.
    64.01 x 57.91 x 35.05 mm.
    Material: Aluminum
  14. Small black plastic waterproof enclosure
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    HD-22F
    As low as $3.88 per unit
    2.63 x 2.63 x 1.63 in.
    66.80 x 66.80 x 41.40 mm.
    Material: Polycarbonate
  15. ML-22F*15 Gray outdoor waterproof enclosure rated NEMA 4x and NEMA 6P - 2.63 x 2.63 x 1.63 inches
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    ML-22F
    As low as $5.80 per unit
    2.63 x 2.63 x 1.63 in.
    66.80 x 66.80 x 41.40 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
    As low as $18.49 per unit
    3.13 x 2.93 x 2.05 in.
    79.50 x 74.42 x 52.07 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
    As low as $10.49 per unit
    3.13 x 2.93 x 2.05 in.
    79.50 x 74.42 x 52.07 mm.
    Material: Aluminum
  18. WA-31*16 Gray indoor NEMA 4x waterproof enclosure for electronics - 3.23 x 3.15 x 2.17 inches
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    WA-31
    As low as $6.32 per unit
    3.23 x 3.15 x 2.17 in.
    82.04 x 80.01 x 55.12 mm.
    Material: ABS
  19. WA-31F*16 Gray indoor NEMA 4x waterproof enclosure for electronics with wall mount flange - 3.23 x 3.15 x 2.17 inches
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    WA-31F
    As low as $6.92 per unit
    3.23 x 3.15 x 2.17 in.
    82.04 x 80.01 x 55.12 mm.
    Material: ABS
  20. WC-31*1508 Gray with Clear Cover outdoor NEMA 4x enclosure for electronics - 3.23 x 3.15 x 2.17 inches
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    WC-31
    As low as $8.92 per unit
    3.23 x 3.15 x 2.17 in.
    82.04 x 80.01 x 55.12 mm.
    Material: Polycarbonate
  21. WC-31F*1508 Gray with Clear Cover outdoor NEMA 4x enclosure for electronics - 3.23 x 3.15 x 2.17 inches
    Add to Compare Add to Wish List
    WC-31F
    As low as $9.36 per unit
    3.23 x 3.15 x 2.17 in.
    82.04 x 80.01 x 55.12 mm.
    Material: Polycarbonate
  22. WP-31*15 Gray outdoor NEMA 4x waterproof enclosure - 3.23 x 3.15 x 2.17 inches
    Add to Compare Add to Wish List
    WP-31
    As low as $8.92 per unit
    3.23 x 3.15 x 2.17 in.
    82.04 x 80.01 x 55.12 mm.
    Material: Polycarbonate
  23. WP-31F*15 Gray outdoor NEMA 4x waterproof enclosure - 3.23 x 3.15 x 2.17 inches
    Add to Compare Add to Wish List
    WP-31F
    As low as $9.36 per unit
    3.23 x 3.15 x 2.17 in.
    82.04 x 80.01 x 55.12 mm.
    Material: Polycarbonate
  24. Timer Module

    Polycase Customization Services

    Minimal cost. Maximum impact.

    Learn More

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Customization Services

CNC Machining

From simple cutouts to threaded or counterbored holes, we can machine virtually any size or shape opening.
Learn More

Digital Printing

Skip the label with our vibrant, full-color graphics printed right onto your enclosure.
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Enhance your product. Impress your customers.

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waterproof electrical enclosure

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