Overview
ISO 8820-11:2020 specifies fuse-links with tabs (blade type) - Type M (medium‑high current) for road vehicles. The standard defines rated currents, dimensional requirements, required markings and colour coding, test procedures and performance criteria for automotive blade fuses with a rated voltage of 32 V, current ratings up to ≤ 80 A, and a breaking capacity of 1 000 A. It is intended to be used together with ISO 8820‑1 and ISO 8820‑2 for complete guidance on automotive fuse design and testing.
Key topics and technical requirements
- Scope and ratings: Applies to blade-type Type M fuse-links for road vehicles - rated voltage 32 V, rated current ≤ 80 A, breaking capacity 1 000 A.
- Marking & colour coding: Colour codes associate rated currents to colours (examples: 20 A - yellow; 25 A - white; 30 A - green; 40 A - orange; 50 A - red; 60 A - blue; 70 A - brown; 80 A - black/dark grey).
- Performance tests: Includes voltage drop, transient current cycling, environmental/climatic and chemical loads, mechanical load, current steps, breaking capacity, operating time rating and temperature rise.
- Test fixtures and electrical requirements: Test fixture connection resistance requirement ≤ 0.35 mΩ for Type M to ensure valid electrical test conditions. Fuse-links must provide visible evidence of an open fuse element after operation.
- Terminal strength: Defined terminal forces and deformation limits (per standard test methods) to verify mechanical robustness of tabs.
- Dimensions: Detailed dimensional drawings and tolerances (Figure 5 and Table references) to ensure interchangeability and correct fit in receptacles.
- Reference materials: Normative references include ISO 8820‑1, ISO 6722‑1 (cable specifications) and ISO 2768‑1 (tolerances).
Applications and practical value
- Ensures safety and reliability of medium‑high current blade fuses in automotive electrical systems (power distribution, protection of high-current circuits).
- Enables consistent product design, supplier specification and quality control for fuse manufacturers and OEMs.
- Provides test procedures for certification and type-approval, helping test labs and compliance engineers demonstrate fuse performance under transient, overload and environmental conditions.
- Helps vehicle electrical system designers choose fuse-links that meet breaking capacity, operating time, voltage drop and temperature requirements for specific circuits.
Who should use this standard
- Automotive fuse manufacturers and component designers
- Vehicle OEMs, electrical system designers and harness suppliers
- Test laboratories and certification bodies
- Quality engineers and regulatory authorities involved in automotive electrical safety
Related standards
Keywords: ISO 8820-11:2020, Type M fuse-links, blade-type fuses, automotive fuses, medium-high current, 32 V fuse, 1000 A breaking capacity, fuse testing, voltage drop, operating time.