The IK rating is an international code which measures the degree of protection against mechanical wear and tear as well as the amount of impact a specific fixture can take. It is a measure of a fixtures robustness and durability.
What is an IK rating, and how does it apply to motion control products?
Deciphering LED Fixture Symbols & Protection Degrees
IK code: Impact protection in line with the IEC62262 standard - LISUN
IK - IP Ingress Protection Standards - IP66 - IP67 Explained
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Degree of protection IP and IK: What are they and how are they used? - GreenIce
IP (international protection or ingress protection) and IK (impact protection) ratings
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IK01 IK02 IK03 IK04 IK05 IK06 IK07 IK08 IK09 IK10 Impact Test EMCTEST
Knowledge
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IP / IK protection classes - Rolec USA Electronic Enclosures & Suspension Arms - ROLEC Gehäuse-Systeme