General SPD framework
IEC 61643-01:2024 contains common requirements and test methods for SPDs used against lightning effects and other transient overvoltages on low-voltage circuits.
AC low-voltage systems
IEC 61643-11:2025 applies to SPDs connected to AC low-voltage power systems. Application and coordination principles are addressed by IEC 61643-12:2020.
Telecom / signalling
IEC 61643-21:2025 applies to SPDs connected to telecommunications and signalling networks, including networks that may also carry power such as PoE.
DC / PV-related circuits
IEC 61643-41:2025 applies to SPDs connected to DC low-voltage power systems up to the stated scope limits. PV projects require coordinated review with the relevant system and IEC 62305-4 concepts.
Engineering Reference Table
| Standard | Use |
|---|---|
| IEC 61643-01:2024 | Common SPD requirements / tests. |
| IEC 61643-11:2025 | AC low-voltage SPD product requirements. |
| IEC 61643-12:2020 | Selection and application principles for AC power SPDs. |
| IEC 61643-21:2025 | Telecom/signalling SPDs. |
| IEC 61643-41:2025 | DC low-voltage SPDs. |
Project Implementation Checklist
For an actual project, record the applicable standard edition, risk-assessment assumptions, approved drawings, selected design method, calculation revision, component specification, inspection/testing requirements and final engineering approval.
Official Source
Use the official issuing body's publication for the controlled standard text and current status.