ISO 20934:2019 PDF

Road vehicles — Fuse-links with axial terminals for use in 48V networks — Types SF36-70V, SF51-70V and SF56-70V

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Title (English):

ISO 20934:2019

Road vehicles — Fuse-links with axial terminals for use in 48V networks — Types SF36-70V, SF51-70V and SF56-70V

Document status:: Active
Format:: Electronic (PDF)
Number of pages:: 20
Publication date:: April 1, 2019
Edition:: ISO IS 20934 edition 1 version 1
ICS:: 43.040.10

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Description (English):

This document specifies fuse-links with axial terminals (Strip fuse-links) Types SF36‑70V, SF51‑70V and SF56‑70V used in road vehicles. It establishes, for these fuse-link types, the rated current, test procedures, performance requirements, and dimensions. This document is applicable to fuse-links with a rated voltage of 70 V DC, a rated current of 30 A to 500 A, and a breaking capacity of 2 500 A intended for use in the electrical system of road vehicles with a nominal voltage of 48 V DC. This document is intended to be used in conjunction with ISO 8820-1 and with ISO 8820-2. The numbering of its clauses corresponds to that of ISO 8820-1, whose requirements are applicable, except where modified by requirements particular to this document.

Technical details

Technical committee: ISO/TC 22/SC 32 - Electrical and electronic components and general system aspects
SKU: ISO 20934:2019

Abstract

Overview - ISO 20934:2019 and fuse-links for 48V networks

ISO 20934:2019 specifies fuse-links with axial terminals (strip fuse-links) - Types SF36‑70V, SF51‑70V and SF56‑70V - intended for use in road-vehicle electrical systems with a nominal voltage of 48 V DC. The standard defines rated voltage (70 V DC), rated currents from 30 A to 500 A, a breaking capacity of 2 500 A, plus the required test procedures, performance limits and dimensional requirements for these fuse types. It is intended to be used together with ISO 8820‑1 and ISO 8820‑2.

Key topics and technical requirements

Rated parameters: 70 V DC rated voltage; rated currents 30 A–500 A; breaking capacity 2 500 A for automotive 48V systems.
Performance and testing: specifies tests and pass/fail criteria including:
- Voltage drop measurements
- Current cycling and current-step tests
- Operating time rating (fuse melting/clearing characteristics)
- Breaking capacity verification
- Overload, cold-resistance and insulation resistance tests
- Mechanical stability, shock and vibration tests
- Environmental tests (climatic, chemical and temperature shock)
Design and marking: requirements for marking, labelling and colour coding (fuse-links shall be additionally marked with U “70 V”; a colour-code table is provided for rated-current identification).
Dimensions and mounting: dimensional requirements, including bolt‑down and clinchable variants and test-fixture specifications, plus examples of designation.

Practical applications

48V vehicle electrical protection: selection and qualification of inline fuses for mild‑hybrid and 48V power-distribution architectures.
Component design and validation: use by fuse manufacturers to design axial strip fuses that meet automotive durability, electrical and environmental requirements.
System safety and compliance: integration by OEMs and Tier‑1 suppliers to ensure circuit protection meets standardized breaking capacity, operating time and environmental resilience.
Test and certification: benchmark for laboratories performing electrical, climatic and mechanical testing of automotive fuse-links.

Who should use this standard

Automotive OEM engineers and electrical system designers
Fuse and component manufacturers (R&D and quality teams)
Test houses and certification bodies
Procurement and compliance teams specifying fuse performance for 48V networks

Related standards

ISO 8820‑1 and ISO 8820‑2 (fuse-links definitions and general requirements)
ISO 6722‑1 (vehicle single-core cables)
ISO 16750‑3, ISO 16750‑5 (environmental testing for electrical/electronic equipment)
IEC 60068‑2‑14 (temperature change tests)

ISO 20934:2019 provides a focused, test-driven specification for axial fuse‑links used in modern 48V automotive networks, helping manufacturers and vehicle makers ensure reliable circuit protection and regulatory conformance.

Related standards

Standards mentioned in the description

Abstract

Overview - ISO 20934:2019 and fuse-links for 48V networks

Key topics and technical requirements

Rated parameters: 70 V DC rated voltage; rated currents 30 A–500 A; breaking capacity 2 500 A for automotive 48V systems.
Performance and testing: specifies tests and pass/fail criteria including:
- Voltage drop measurements
- Current cycling and current-step tests
- Operating time rating (fuse melting/clearing characteristics)
- Breaking capacity verification
- Overload, cold-resistance and insulation resistance tests
- Mechanical stability, shock and vibration tests
- Environmental tests (climatic, chemical and temperature shock)
Design and marking: requirements for marking, labelling and colour coding (fuse-links shall be additionally marked with U “70 V”; a colour-code table is provided for rated-current identification).
Dimensions and mounting: dimensional requirements, including bolt‑down and clinchable variants and test-fixture specifications, plus examples of designation.

Practical applications

48V vehicle electrical protection: selection and qualification of inline fuses for mild‑hybrid and 48V power-distribution architectures.
Component design and validation: use by fuse manufacturers to design axial strip fuses that meet automotive durability, electrical and environmental requirements.
System safety and compliance: integration by OEMs and Tier‑1 suppliers to ensure circuit protection meets standardized breaking capacity, operating time and environmental resilience.
Test and certification: benchmark for laboratories performing electrical, climatic and mechanical testing of automotive fuse-links.

Who should use this standard

Automotive OEM engineers and electrical system designers
Fuse and component manufacturers (R&D and quality teams)
Test houses and certification bodies
Procurement and compliance teams specifying fuse performance for 48V networks

Related standards

ISO 8820‑1 and ISO 8820‑2 (fuse-links definitions and general requirements)
ISO 6722‑1 (vehicle single-core cables)
ISO 16750‑3, ISO 16750‑5 (environmental testing for electrical/electronic equipment)
IEC 60068‑2‑14 (temperature change tests)

ISO 20934:2019 PDF

Technical details

Abstract

Overview - ISO 20934:2019 and fuse-links for 48V networks

Key topics and technical requirements

Practical applications

Who should use this standard

Related standards

Related standards

Abstract

Overview - ISO 20934:2019 and fuse-links for 48V networks

Key topics and technical requirements

Practical applications

Who should use this standard

Related standards

Related standards

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