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NEMA 3S Enclosures

Browse dependable NEMA 3S enclosure solutions for indoor or outdoor use. NEMA 3S boxes offer the same protection as NEMA 3 enclosures, but with added protection for external mechanisms to remain operable with ice formation. A variety of sizes and styles of NEMA 3S enclosures are available in polycarbonate plastic for industries such as factory automation, agriculture, alternative energy, and more. Looking for a different NEMA rating? View all NEMA enclosures here.

What kind of protective performance can you expect from a NEMA 3S enclosure? Click “Read More” to find out the details of this NEMA enclosure type.

What Is a NEMA Type 3S Enclosure?

NEMA enclosure ratings are a system that the National Electrical Manufacturers Association has established for evaluating how well electrical enclosures protect against various environmental conditions, most of them related to the ingress of water and solid materials. These conditions include everything from rain and sleet to falling dirt and windblown dust, all of which can be potentially harmful to the enclosed equipment and electrical connectors.

NEMA 3 enclosures are designated as suitable for both outdoor and indoor use, and they offer a substantial degree of protection against hazards such as light splashing of water, contact with hazardous parts, and flying lint or dust. A NEMA 3S rating builds on the protection offered by a NEMA 3 rating with a specific protective feature designed for environments where freeze-over conditions are possible. 

Specifically, a NEMA 3S enclosure’s external mechanisms, such as its hinges and/or lock, must remain operable even when ice has formed on the outside of the enclosure. For cold-weather applications, this feature can be a must-have for keeping key electrical components and controls accessible during unfavorable weather conditions.

NEMA 3S Enclosures from Polycase

You’ll find Polycase’s full selection of NEMA 3S-rated enclosures on this page. Our polycarbonate NEMA 3S electrical enclosures offer excellent performance and easy customization through our CNC machining and printing services. Use the filters on the side of this page to choose other features you’re looking for and find your perfect enclosure solution.

Our NEMA 3S enclosure models also typically feature additional NEMA ratings, such as NEMA 4X and NEMA 6. Thus, in addition to the core protective features of a NEMA 3S rating, these enclosures often provide extra features such as corrosion resistance or the ability to withstand temporary submersion and hose-directed water. We design our NEMA-rated enclosures for compliance with multiple ratings so that they provide the best possible level of protection for the diverse needs of our customers’ applications. 

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  1. HD-22F
    As low as $3.88 per unit
    2.63 x 2.63 x 1.63 in.
    67 x 67 x 41 mm.
    Material: Polycarbonate
  2. ML-22F
    As low as $5.80 per unit
    2.63 x 2.63 x 1.63 in.
    67 x 67 x 41 mm.
    Material: Polycarbonate
  3. ZH-040404
    As low as $27.91 per unit
    4.40 x 4.40 x 4.33 in.
    112 x 112 x 110 mm.
    Material: Polycarbonate
  4. ZQ-040404
    As low as $26.50 per unit
    4.40 x 4.40 x 4.33 in.
    112 x 112 x 110 mm.
    Material: Polycarbonate
  5. ML-24F
    As low as $7.99 per unit
    4.50 x 2.63 x 2.05 in.
    114 x 67 x 52 mm.
    Material: Polycarbonate
  6. ML-44F
    As low as $11.10 per unit
    4.50 x 4.50 x 2.44 in.
    114 x 114 x 62 mm.
    Material: Polycarbonate
  7. ML-34F
    As low as $8.67 per unit
    4.53 x 3.56 x 2.25 in.
    115 x 90 x 57 mm.
    Material: Polycarbonate
  8. HD-24F
    As low as $5.46 per unit
    4.63 x 2.63 x 1.63 in.
    118 x 67 x 41 mm.
    Material: Polycarbonate
  9. HD-25F
    As low as $5.72 per unit
    4.63 x 2.63 x 2.37 in.
    118 x 67 x 60 mm.
    Material: Polycarbonate
  10. HD-44F
    As low as $7.64 per unit
    4.63 x 4.63 x 2.36 in.
    118 x 118 x 60 mm.
    Material: Polycarbonate
  11. HD-35F
    As low as $6.71 per unit
    5.50 x 3.50 x 1.50 in.
    140 x 89 x 38 mm.
    Material: Polycarbonate
  12. promo card - ex

    Take your enclosure from plain to powerful

    with Polycase customization services

    Learn More
  13. HD-36F
    As low as $7.04 per unit
    5.50 x 3.50 x 2.36 in.
    140 x 89 x 60 mm.
    Material: Polycarbonate
  14. ML-45F
    As low as $11.28 per unit
    5.50 x 4.13 x 2.44 in.
    140 x 105 x 62 mm.
    Material: Polycarbonate
  15. ML-46F
    As low as $12.02 per unit
    6.13 x 4.63 x 2.44 in.
    156 x 118 x 62 mm.
    Material: Polycarbonate
  16. ZH-060404
    As low as $34.89 per unit
    6.40 x 4.40 x 4.33 in.
    163 x 112 x 110 mm.
    Material: Polycarbonate
  17. ZQ-060404
    As low as $33.12 per unit
    6.40 x 4.40 x 4.33 in.
    163 x 112 x 110 mm.
    Material: Polycarbonate
  18. ZH-060604
    As low as $39.18 per unit
    6.40 x 6.40 x 5.22 in.
    163 x 163 x 133 mm.
    Material: Polycarbonate
  19. ZQ-060604
    As low as $37.23 per unit
    6.40 x 6.40 x 5.22 in.
    163 x 163 x 133 mm.
    Material: Polycarbonate
  20. ML-36F
    As low as $11.01 per unit
    6.50 x 3.25 x 3.39 in.
    165 x 83 x 86 mm.
    Material: Polycarbonate
  21. HD-46F
    As low as $7.63 per unit
    6.63 x 4.68 x 1.63 in.
    168 x 119 x 41 mm.
    Material: Polycarbonate
  22. HD-45F
    As low as $8.02 per unit
    6.63 x 4.68 x 2.37 in.
    168 x 119 x 60 mm.
    Material: Polycarbonate
  23. ML-48F
    As low as $12.43 per unit
    7.61 x 4.61 x 2.26 in.
    193 x 117 x 57 mm.
    Material: Polycarbonate
  24. promo card - ex

    Take your enclosure from plain to powerful

    with Polycase customization services

    Learn More

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Customization Services

CNC Machining

Receive your enclosures with the cutouts you need, so they are ready to go to work for you. 
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Digital Printing

Weatherproof and chemical-resistant ink printed directly onto the enclosure, that won't peel, bubble or scratch.
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Minimal Cost. Maximum Impact.

Outdoor enclosure with digital printing

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