Electrical Knockout Boxes

Knockout boxes for electrical applications provide the flexibility of onsite setup of cables, wiring, or conduit. Made from durable polycarbonate plastic, the enclosures are molded with metric knockouts that can simply be removed with a screwdriver. The metric knockouts accommodate a variety of accessories like cable glands and vents which can easily convert the knockout box into a vented enclosure. As with all of our NEMA 4X enclosure types, our knockout series comes with a gasketed cover to create a watertight seal that also meets IP66 Rating requirements. Knockout boxes are especially useful as a junction box for indoor or outdoor environments.

Discover the advantages of knockout boxes in depth below. Click “Read More” to learn about what Polycase’s knockout boxes offer for your application.

What Is a Knockout Electrical Box?

Knockout electrical boxes are a special type of electrical enclosure that simplifies setup for junction boxes, electrical panels, communications equipment, and any other type of enclosure that requires pass-throughs for connectors and cables. From electrical wiring to antennas to stress relief clamps, electrical devices require all kinds of equipment that needs a point to enter and exit the enclosure. 

Manually creating cutouts for these using a knockout punch is laborious and time-consuming work. By using a knockout box instead, electricians and device designers can skip the process of measuring and punching their own knockouts, creating a fast and headache-free installation process. Box knockouts are pre-measured to create perfectly sized openings for common conduit sizes, and each takes just a few seconds to remove. They can also be easily reclosed by knockout plugs and knockout seals later.

Many knockout electrical box models also include NEMA and/or IP ratings for protection against water and particulate matter, as well as additional protective features like corrosion resistance. To get the full benefit of these protection ratings, it’s important to find the right size of cable glands and/or seals to maintain a tight seal around the knockout hole.

Knockout Electrical Boxes from Polycase

Polycase’s SK Series knockout enclosures are rugged, German-manufactured polycarbonate electrical enclosures. The SK Series’ rugged construction provides NEMA 4X-rated outdoor protection against environmental conditions and an IK08 impact rating to mitigate physical shocks. This makes them an excellent choice for applications that require not just easy setup, but substantial durability as well. 

Our SK Series models are even available with optional clear covers for devices that require quick access to status indicators and data readouts. Plus, we offer a full range of SK Series accessories to make sure your enclosure is well protected against water and dust and to simplify mounting your electrical equipment inside the enclosure. 

Need to customize your own cutouts and knockouts on an enclosure? Be sure to check out Polycase’s easy customization options through custom CNC machining! Get an instant quote on the exact enclosure cutouts you need. Don’t forget the options for high-quality digital printing that we also have available. 

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  1. SK-11
    As low as $8.51 per unit
    2.56 x 2.56 x 2.24 in.
    65 x 65 x 57 mm.
    Material: Polycarbonate
  2. SK-12
    As low as $10.64 per unit
    3.70 x 2.56 x 2.24 in.
    94 x 65 x 57 mm.
    Material: Polycarbonate
  3. SK-25
    As low as $12.64 per unit
    3.70 x 2.56 x 3.10 in.
    94 x 65 x 79 mm.
    Material: Polycarbonate
  4. SK-13
    As low as $12.23 per unit
    3.70 x 3.70 x 2.24 in.
    94 x 94 x 57 mm.
    Material: Polycarbonate
  5. SK-14
    As low as $16.35 per unit
    4.33 x 4.33 x 2.60 in.
    110 x 110 x 66 mm.
    Material: Polycarbonate
  6. SK-15
    As low as $15.70 per unit
    5.12 x 3.70 x 2.24 in.
    130 x 94 x 57 mm.
    Material: Polycarbonate
  7. SK-26
    As low as $17.78 per unit
    5.12 x 3.70 x 3.10 in.
    130 x 94 x 79 mm.
    Material: Polycarbonate
  8. SK-16
    As low as $20.20 per unit
    5.12 x 5.12 x 2.95 in.
    130 x 130 x 75 mm.
    Material: Polycarbonate
  9. SK-17
    As low as $20.32 per unit
    7.09 x 3.70 x 2.24 in.
    180 x 94 x 57 mm.
    Material: Polycarbonate
  10. SK-27
    As low as $23.93 per unit
    7.09 x 3.70 x 3.10 in.
    180 x 94 x 79 mm.
    Material: Polycarbonate
  11. SK-29
    As low as $26.96 per unit
    7.09 x 4.33 x 3.45 in.
    180 x 110 x 88 mm.
    Material: Polycarbonate
  12. electronics enclosure

    Take your enclosure from plain to powerful

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  13. SK-18
    As low as $30.89 per unit
    7.09 x 5.12 x 3.31 in.
    180 x 130 x 84 mm.
    Material: Polycarbonate
  14. SK-28
    As low as $30.97 per unit
    7.17 x 7.09 x 2.42 in.
    182 x 180 x 61 mm.
    Material: Polycarbonate
  15. SK-19
    As low as $35.48 per unit
    7.17 x 7.09 x 3.54 in.
    182 x 180 x 90 mm.
    Material: Polycarbonate
  16. SK-20
    As low as $42.10 per unit
    10.00 x 7.09 x 2.48 in.
    254 x 180 x 63 mm.
    Material: Polycarbonate
  17. SK-23
    As low as $45.72 per unit
    10.00 x 7.09 x 3.31 in.
    254 x 180 x 84 mm.
    Material: Polycarbonate
  18. SK-24
    As low as $47.54 per unit
    10.00 x 7.09 x 3.54 in.
    254 x 180 x 90 mm.
    Material: Polycarbonate
  19. SK-21
    As low as $51.61 per unit
    10.00 x 7.09 x 4.37 in.
    254 x 180 x 111 mm.
    Material: Polycarbonate
  20. SK-22
    As low as $109.60 per unit
    14.21 x 10.00 x 4.37 in.
    361 x 254 x 111 mm.
    Material: Polycarbonate
  21. SK-30
    As low as $125.08 per unit
    14.21 x 10.00 x 6.39 in.
    361 x 254 x 162 mm.
    Material: Polycarbonate

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Digital Printing

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