ISO 8820-10:2020

Overview

ISO 8820-10:2020 specifies fuse-links with tabs (blade-type) Type L (high current miniature) for road vehicles. It defines the rated current range, mechanical and electrical dimensions, test procedures and performance requirements for fuse-links intended for 32 V automotive systems with a current rating up to ≤ 60 A and a breaking capacity of 1 000 A. The document is designed to be used in conjunction with ISO 8820-1 and ISO 8820-2; clause numbering follows ISO 8820-1 unless modified by Type L-specific requirements.

Key topics and technical requirements

• Scope and ratings
  • Rated voltage: 32 V
  • Rated current: ≤ 60 A
  • Breaking capacity: 1 000 A
• Dimensions and marking
  • Detailed dimensional requirements and tolerances for Type L fuse-links (see Table 7 in the standard)
  • Colour coding by rated current (e.g., 20 A yellow, 25 A white, 30 A green, 40 A orange, 50 A red, 60 A blue) and marking/label requirements
• Electrical performance tests
  • Voltage-drop measurements across fuse tabs with specified test fixture geometry and maximum connection resistance (0.5 mΩ)
  • Breaking capacity tested at 1 000 A using specified test dummy
  • Transient current cycling and current-steps tests per the sequences in the standard
  • Operating time-rating tests (timing windows at multiple multiple-of-rated-current values) with post-activation leakage limits (≤ 0.5 mA)
• Mechanical and environmental tests
  • Terminal strength tests with specified forces (force directions and magnitudes defined; deformation limits)
  • Climatic, chemical and mechanical load tests referenced to ISO 8820-1
  • Temperature-rise requirements (Annex A)
• Test protocols
  • Defined test sequences, required sample group sizes (minimum 10 per rated current) and prescribed cable sizes for comparative testing

Applications and who uses it

• Automotive fuse manufacturers designing high-current miniature (Type L) blade fuses
• Vehicle OEMs and tier‑1 suppliers specifying in-vehicle overcurrent protection components
• Electrical design engineers validating fuse selection for 32 V systems (power distribution, battery and starter circuits)
• Test laboratories and conformity assessors performing type approval and comparative performance testing
• Aftermarket and replacement-part manufacturers ensuring compatibility with standard receptacles and extraction tools

Related standards

• ISO 8820-1: Definitions and general test requirements (used together with Part 10)
• ISO 8820-2: Additional fuse-link types and requirements
• ISO 2768-1: General tolerances for dimensions (referenced for tolerances)

ISO 8820-10:2020 provides essential, standardized criteria for specifying, testing and validating Type L automotive blade fuses-ensuring safety, interchangeability and reliable overcurrent protection in modern road vehicles.