ISO 20934:2019 pdf download – Road vehicles – Fuse-links with axial terminals for use in 48V networks – Types SF36-70V, SF51- 70V and SF56-70V
1 Scope
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.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
ISO 6722-1, Road vehicles — 60 V and 600 V single-core cables — Part 1: Dimensions, test methods and requirements for copper conductor cables
ISO 8820-1:2014, Road vehicles — Fuse-links — Part 1: Definitions and general test requirements
ISO 16750-3:2012, Road vehicles — Environmental conditions and testing for electrical and electronic equipment — Part 3: Mechanical loads
ISO 16750-5:2010, Road vehicles — Environmental conditions and testing for electrical and electronic equipment — Part 5: Chemical loads
IEC 60068-2-14:2009, Environmental testing — Part 2-14: Tests — Test N: Change of temperature
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 8820-1 apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https: //www .iso .org/obp
— IEC Electropedia: available at http: //www .electropedia .org/
4 Marking, labelling and colour coding
See ISO 8820-1. The fuse-link shall be additionally marked with U R “70 V”, the colour coding given in Table 1 shall apply.
5.1 General
5.1.1 General test conditions
See ISO 8820-1 and the following:
— Install the fuse-link in the test fixture with a torque of 9 Nm ± 1 Nm for M6 bolts and a torque of 20 Nm ± 1 Nm for M8 bolts. For a method to conduct retightening torque and setting behaviour, see Annex A.
— The bolt-down fuse-link validation shall apply to the clinchable version.
— If clinchable fuse-links need to be tested on the test fixtures shown in Figures 10, 11, or 12 for the tests, then a hole should be produced into the clinch-terminal to fit the bolt-down test fixture.
Perform the tests according to the test sequence in Table 2.
Fuse-link types SF51-70V and SF56-70V with a rated current between 300 A and 500 A shall only be used for short circuit protection.
5.1.2 General performance requirements
See ISO 8820-1 and the following:
— After the tests, the insulator shall be intact, visible cracks are not permitted.