Overview
IEC 60898-3:2019 specifies requirements for DC circuit-breakers intended for overcurrent protection in household and similar wiring installations. The standard covers circuit‑breakers for DC operation with a rated DC voltage ≤ 440 V, rated current ≤ 125 A and rated short‑circuit capacity ≤ 10 000 A. These devices are designed for use by uninstructed people and for installations that are not intended to be maintained.
Key topics and technical requirements
- Scope and classification – Definitions, device types, number of poles and current direction through poles for DC operation.
- Rated quantities – Rated DC voltage, rated current and rated short‑circuit capacity within the values above.
- Construction and safety – Mechanical design, protection against electric shock, clearances and creepage distances for insulation coordination.
- Performance characteristics – Tripping characteristics (time‑current and instantaneous), behaviour at small DC currents and making (inrush) currents, temperature rise and continuous duty.
- Terminals and connections – Requirements for screws, current‑carrying parts, terminal reliability and non‑interchangeability.
- Marking and information – Mandatory marking and product information for safe installation and use by non‑specialists.
- Testing and verification – Extensive type tests including dielectric strength, insulation resistance, humidity resistance, temperature rise, mechanical and electrical endurance, short‑circuit performance and verification of tripping characteristics.
- Annexes – Normative annexes include methods for determining clearances/creepage and test sequences/sample requirements.
Applications and who uses this standard
IEC 60898-3:2019 is used by:
- Manufacturers developing DC circuit-breakers for residential and similar installations.
- Test and certification laboratories performing type and routine testing to verify compliance.
- Electrical specifiers and designers selecting overcurrent protection for building DC circuits (e.g., small DC distribution, battery and PV subsystem protection in dwellings).
- Regulatory bodies and procurement teams creating product requirements and compliance criteria for household electrical safety.
- Installers and inspection authorities relying on standard marking and information to ensure safe, non‑specialist use.
Related standards
- Other parts of the IEC 60898 family (covering AC and general overcurrent protection for household installations).
- Low‑voltage switchgear and protection standards (for broader industrial/residential contexts), and national wiring regulations that reference IEC standards.
Keywords: IEC 60898-3:2019, DC circuit-breakers, overcurrent protection, household installations, rated DC voltage 440 V, rated current 125 A, short-circuit capacity 10000 A, tripping characteristic, insulation, creepage, type tests.
Open preview (PDF)Electrical accessories - Circuit-breakers for overcurrent protection for household and similar installations - Part 3: Circuit-breakers for DC operation
