IEC 62443 certification now regularly turns up in tender documents from grid operators. Is this sensible risk management, or mostly a tick on a list? As so often, the answer lies in the details.
What certification does and does not demonstrate
An IEC 62443-4-2 certification for a component shows that an independent party has verified that the product meets the technical requirements for a specific Security Level. It does not show that the product is correctly configured in the final environment, and certainly not that the wider zone in which it sits is adequately secured. Certification is a building block, not an end point.
Where certification does add value
For buyers, certification is an efficient way to guarantee a minimum level without having to test every product in depth themselves. For a grid operator managing hundreds of component types, this is a real practical advantage: it shifts part of the verification burden to an independent certifier.
Where it goes wrong
Certification becomes problematic when it is treated as a substitute for your own risk assessment. A certified component in a poorly segmented network offers little protection. Certification also says nothing about how a system behaves in combination with other components — system integration is exactly where IEC 62443-3-3 and your own zone design choices (-3-2) come into play.
Pragmatic advice
Use certification as one of the procurement criteria, not as the only criterion. Combine it with:
- Your own risk assessment of the zone in which the component will be placed.
- Concrete requirements for the system integrator on architecture and hardening (IEC 62443-2-4 and -3-3).
- Verification during FAT and SAT, regardless of whether the underlying components are certified.
So certification is not hype, but neither is it a guarantee. It is one building block within a broader security programme that also includes governance, architecture and verification.