IK ratings are defined as IK and a number from 00 to 10, this indicates the degree of protection provided by the electrical enclosures against external mechanical impacts.

IK Rated products are important especially if they are in public areas, high traffic areas, commercial environments and areas that are prone to vandalism. If a product becomes damaged, this can result in the product failing to work or even failing completely. Damage leads to additional costing to repair or replace, it also leads to the potential need to close areas to access. A broken product may also lead to a hazard especially in public areas, such as left over debris or lack of required illumination/information.

And here are the IK ratings:

IK00: Not protected

IK01: Protected against 0.14 joules impact.

Equivalent to impact of 0.25 kg mass dropped from 56 mm above impacted surface.

IK02: Protected against 0.2 joules impact.

Equivalent to impact of 0.25 kg mass dropped from 80 mm above impacted surface.

IK03: Protected against 0.35 joules impact.

Equivalent to impact of 0.25 kg mass dropped from 140 mm above impacted surface.

IK04: Protected against 0.5 joules impact.

Equivalent to impact of 0.25 kg mass dropped from 200 mm above impacted surface.

IK05: Protected against 0.7 joules impact.

Equivalent to impact of 0.25 kg mass dropped from 280 mm above impacted surface.

IK06: Protected against 1 joules impact.

Equivalent to impact of 0.25 kg mass dropped from 400 mm above impacted surface.

IK07 Protected against 2 joules impact.

Equivalent to impact of 0.5 kg mass dropped from 400 mm above impacted surface.

IK08: Protected against 5 joules impact.

Equivalent to impact of 1.7 kg mass dropped from 300 mm above impacted surface.

IK09: Protected against 10 joules impact.

Equivalent to impact of 5 kg mass dropped from 200 mm above impacted surface.

IK10: Protected against 20 joules impact.

Equivalent to impact of 5 kg mass dropped from 400 mm above impacted surface.

I hope you find this write up helpful.