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Steel Enclosures & Boxes

Steel enclosures and junction boxes from Polycase are available in both carbon steel and stainless steel varieties. Our steel electrical boxes are UL Listed, ensuring your equipment is protected in harsh indoor or outdoor environments. Polycase steel enclosures meet common NEMA ratings including NEMA 1, 2, 4, 4X and 12, as well as IP65 and IP66 requirements. Each steel box includes a hinged cover, an internal panel and surface mounting hardware. Optional accessories include pole mounting kits and cable gland and venting solutions.

Evaluating carbon steel and stainless steel enclosures for your application? Read more below for key facts from our guide to Carbon Steel vs. Stainless Steel, plus info on the top applications for steel enclosures.

Should I Choose Carbon Steel or Stainless Steel Enclosures?

Polycase offers NEMA enclosures made from high-quality steel, including 304 stainless steel and 16-gauge powder-coated carbon steel. Both carbon steel and stainless steel are durable and versatile materials for electrical enclosures — but which one offers the benefits you need?

  • Stainless steel enclosures, like our NEMA 4X-rated SA Series, provide the best corrosion resistance available. However, powder-coated carbon steel alternatives like the SB Series also offer corrosion protection.
  • Carbon steel enclosures can be a better choice if you need to customize your enclosure with machined cutouts since stainless steel requires specialized tools to cut.
  • Stainless steel offers better performance in extreme heat conditions than carbon steel. For applications that require resistance to extremely high temperatures, stainless steel enclosures are usually a better choice.
  • Carbon steel tends to be harder and less vulnerable to denting than stainless steel, so it can be a better choice for enclosures on which impact resistance is a priority.
  • Carbon steel enclosures are typically available at a lower price point than stainless steel, making them a cost-effective option for junction boxes and other applications.

For more guidelines to help you choose between carbon steel and stainless steel enclosures, see our complete guide to carbon steel vs. stainless steel.

Key Applications for Steel NEMA Enclosures

Both carbon steel and stainless steel enclosures are common choices for heavy-duty applications, including:

  • Heavy manufacturing
  • Oil and gas production
  • Wastewater treatment
  • Pharmaceutical manufacturing
  • Food and beverage processing

Obviously, durability is critical for these applications. However, it’s the full package of features our enclosures offer that truly makes them the most dependable in the toughest environments. Keyed quarter-turn latches make it simple to secure your device, and the included kit gets you up and running with everything you need, from wall mounting feet to internal mounting panels. Our steel enclosures even provide a degree of RFI/EMI attenuation for applications that require electrical interference management.

Shop our selection of steel enclosures here, or jump straight to our stainless steel or carbon steel enclosure options to find exactly what you’re looking for.

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  1. SA-38
    As low as $132.15 per unit
    7.87 x 5.91 x 5.91 in.
    200 x 150 x 150 mm.
    Material: Stainless Steel
  2. SB-38
    As low as $50.64 per unit
    7.87 x 5.91 x 5.91 in.
    200 x 150 x 150 mm.
    Material: Steel
  3. SA-39
    As low as $137.91 per unit
    7.87 x 7.87 x 3.98 in.
    200 x 200 x 101 mm.
    Material: Stainless Steel
  4. SB-39
    As low as $48.87 per unit
    7.87 x 7.87 x 3.98 in.
    200 x 200 x 101 mm.
    Material: Steel
  5. SA-41
    As low as $164.43 per unit
    9.84 x 7.87 x 3.98 in.
    250 x 200 x 101 mm.
    Material: Stainless Steel
  6. SB-41
    As low as $54.86 per unit
    9.84 x 7.87 x 3.98 in.
    250 x 200 x 101 mm.
    Material: Steel
  7. SA-30
    As low as $190.95 per unit
    9.84 x 7.87 x 5.91 in.
    250 x 200 x 150 mm.
    Material: Stainless Steel
  8. SB-30
    As low as $58.20 per unit
    9.84 x 7.87 x 5.91 in.
    250 x 200 x 150 mm.
    Material: Steel
  9. SA-40
    As low as $212.90 per unit
    9.84 x 9.84 x 5.91 in.
    250 x 250 x 150 mm.
    Material: Stainless Steel
  10. SB-40
    As low as $67.42 per unit
    9.84 x 9.84 x 5.91 in.
    250 x 250 x 150 mm.
    Material: Steel
  11. SA-31
    As low as $248.48 per unit
    11.81 x 9.84 x 5.91 in.
    300 x 250 x 150 mm.
    Material: Stainless Steel
  12. SB-31
    As low as $66.09 per unit
    11.81 x 9.84 x 5.91 in.
    300 x 250 x 150 mm.
    Material: Steel
  13. SA-32
    As low as $281.45 per unit
    11.81 x 9.84 x 7.87 in.
    300 x 250 x 200 mm.
    Material: Stainless Steel
  14. SB-32
    As low as $68.03 per unit
    11.81 x 9.84 x 7.87 in.
    300 x 250 x 200 mm.
    Material: Steel
  15. SA-33
    As low as $279.01 per unit
    11.81 x 11.81 x 5.91 in.
    300 x 300 x 150 mm.
    Material: Stainless Steel
  16. SB-33
    As low as $74.03 per unit
    11.81 x 11.81 x 5.91 in.
    300 x 300 x 150 mm.
    Material: Steel
  17. SA-34
    As low as $312.51 per unit
    11.81 x 11.81 x 7.87 in.
    300 x 300 x 200 mm.
    Material: Stainless Steel
  18. SB-34
    As low as $76.61 per unit
    11.81 x 11.81 x 7.87 in.
    300 x 300 x 200 mm.
    Material: Steel
  19. SA-35
    As low as $338.04 per unit
    15.75 x 11.81 x 5.91 in.
    400 x 300 x 150 mm.
    Material: Stainless Steel
  20. SB-35
    As low as $86.33 per unit
    15.75 x 11.81 x 5.91 in.
    400 x 300 x 150 mm.
    Material: Steel
  21. SA-36
    As low as $372.75 per unit
    15.75 x 11.81 x 7.87 in.
    400 x 300 x 200 mm.
    Material: Stainless Steel
  22. SB-36
    As low as $93.07 per unit
    15.75 x 11.81 x 7.87 in.
    400 x 300 x 200 mm.
    Material: Steel

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