BS EN 60947-5-4:2003

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
Annex ZA (normative) Normative references to
         international publications with their
         corresponding European publications
Bibliography

Applies to separable contacts used in the utilisation area considered such as switching elements for control circuits, considering two rated voltage areas.

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.