ISO 8820-12:2020 pdf free.Road vehicles – Fuse-links -Fuse-links with tabs (blade type) Type
N (sub miniature).
1 Scope
This document specifies fuse-links with tabs (blade-type) Type N (sub miniature), for use in road vehicles. It establishes, for this fuse-link type, the rated current, test procedures, performance requirements and dimensions.
This document is applicable for fuse-links with a rated voltage of 32 V a current rating of 30 A and a breaking capacity of 1 000 A intended for use in road vehicles.
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 8820-1, Road vehicles — Fuse-links — Part 1: Definitions and general test requirements
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/ohp
— IEC Electropedia: available at http://www.electropedia.org/
5 Tests and requirements
5.1 General
5.1.1 Test criteria
In addition to carrying out the test procedures in accordance with Iso 8820-1, the following criteria apply.
Tests shall be performed following the test sequences in Table 2.
The test fixtures for electrical tests shall be designed in accordance with Figure 1. The connection resistance shall be ≤0,8 mil for Type N fuse-links to ensure the proper function of the test fixture. Fuse-links according to this document shall provide for visible evidence of an open fuse-element.
5.1.2 Test sequence
NOTE Points A and B are the measuring points for the voltage drop. Points A-C and B-D are the measuring points for connection resistance.
5.4 Environmental conditions See ISO 8820-1.
5.5 Operating time-rating
5.5.1 Test See ISO 8820-1. For Ip the test duration is 100 h.
5.5.2 Requirement See Table 4. After activation, the current through the fuse-link shall not exceed 0,5 mA at the rated voltage of the fuse-link.
5.6.2 Requirement
See ISO 8820-1. After activation, the current through the fuse-link shall not exceed 0,5 mA at the rated voltage of the fuse-link.
5.7 Breaking capacity
5.7.1 Test See ISO 8820-1. Fuse-link shall be capable of interrupting 1ooo(°)A at 32(’6)VDC with any time constant up to 2,5 ms.
5.7.2 Requirement See ISO 8820-1 After the test, the current through the fuse-link shall not exceed 0,5 mA at the rated voltage of the fuse-link.
5.8.2 Requirements
The deformation of the test sample shall not exceed 0,5 mm. After the test, the insulator shall be intact, and the terminals shall not be removed from the insulator.
5.9 Test cable sizes
Test cable sizes shall be as given in Table 6. All tests for a particular fuse-link, rating shall be performed using the same cable size.
Test cable sizes are specified to allow comparative fuse-link tests to be carried out. The cable size specified herein does not necessarily indicate the size of cable to be used in the vehicle application.ISO 8820 pdf download.