IEC 62443
The cybersecurity standard for industrial and OT environments.
What it is
A series of standards for the security of industrial automation and control systems (IACS/OT) — covering asset owners, integrators, and product suppliers across plants, ICS, and connected machinery.
Certifiable?
Yes — certification schemes exist for products and organizations.
Where it's used
Manufacturing, energy, utilities, industrial plants, connected machinery.
Effort level
Heavy and specialized.
Typical trigger
You operate or build industrial/OT systems.
Related frameworks
OT counterpart to the IT-focused frameworks.
Why it matters
IEC 62443 is the definitive standard for securing industrial and operational technology. As OT environments become more connected, it provides the security framework that keeps physical processes — power plants, factories, water systems — safe.
When is it needed?
When building, integrating, or operating industrial automation systems; when OT/ICS environments need a security program; when selling industrial products that require security certification.
Use cases
- Securing industrial control systems (ICS/SCADA)
- Manufacturing plant cybersecurity programs
- Energy and utility infrastructure protection
- Industrial product development (PLCs, RTUs, HMIs)
- System integrator security assurance
Who asks for it?
- Industrial asset owners and operators
- OT/ICS security teams
- System integrators building automation solutions
- Regulatory bodies for critical infrastructure
- Industrial product buyers requiring security ratings
Benefits
- Covers the full industrial lifecycle (owner, integrator, supplier)
- Security Level (SL) ratings for components and zones
- Certification schemes for products and organizations
- Addresses IT/OT convergence challenges
- Risk-based zone and conduit model
- Recognized globally in industrial sectors
Legal requirements
Increasingly referenced in critical infrastructure regulations (NIS2, KRITIS). Some sectors (nuclear, defense) mandate IEC 62443 compliance for control system procurement.
Key control areas
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