IEC 60947-5-4:2002

FOREWORD
INTRODUCTION
1 Scope and object
2 Normative references
3 Definitions and list of symbols used
   3.1 Definitions
   3.2 List of symbols used
4 General principles
5 General test method
6 General characteristics
   6.1 Measurement methods
   6.2 Sequences of operations
   6.3 Electrical characteristics
   6.4 Characteristics of operation
7 Characterization of defects
   7.1 Basic method
   7.2 Monitoring the load (figure 3)
8 Ambient conditions
   8.1 Normal conditions
   8.2 Preconditioning
   8.3 Particular conditions
9 Methods of reporting
   9.1 Failure criterion
   9.2 Reporting the failure rate
10 Information to be provided in the test report
Annex A (normative) Information to be supplied by the
        manufacturer
Bibliography
Figures
Tables

IEC 60947-5-4:2002 applies to separable contacts used in the utilization area considered, such as switching elements for control circuits. This standard takes into consideration two rated voltage areas:
a) above (and including) 10 V (typically 24 V) where contacts are used for switching loads with possible electrical erosion, such as programmable controller inputs;
b) below 10 V (typically 5 V) with negligible electrical erosion, such as electronic circuits.
This second edition cancels and replaces the first edition which was issued as a technical report in 1996. It now has the status of an International Standard.