IEC 62443 is the international standard series for Industrial Automation and Control Systems security, providing a defence-in-depth framework for asset owners, system integrators, and product suppliers that defines security levels, zones, conduits, and component requirements for OT environments spanning energy, manufacturing, water, and transport. Zero Trust principles align with IEC 62443's zone-and-conduit model — treating every communication between zones as untrusted and requiring authenticated, authorised, and encrypted data flows — and adoption of IEC 62443 is increasingly required in EU contracts and KRITIS operator obligations.
Related: Zero Trust for OT · SCADA · Manufacturing · NIS2 · Energy