NF EN 61811-50 : 2003

1 General
   1.1 Scope
   1.2 Normative references
   1.3 Terms and definitions
   1.4 Preferred values
   1.5 Marking and documentation
 2 Quality assessment procedures
   2.1 Primary stage of manufacture
   2.2 Structurally similar relays
   2.3 Subcontracting
   2.4 Qualification approval procedures
   2.5 Quality conformance inspection
   2.6 Test schedule
   2.7 Order of tests
3 Preparation of blank detail and detail specifications
4 Test schedule
  4.1 Test sequence
  4.2 Types of relays, based upon environmental
      protection (relay technology RT)
  4.3 Categories of application of contacts
  4.4 Notes relative to Table 1
5 Relay reliability - Failure rate data
Annex A (informative) Data base for failure rates
Annex ZA (normative) Normative references to international
                      publications with their corresponding
                      European publications

Applicable to electromechanical all-or-nothing telecom relays of assessed quality. Relays according to this standard are provided for operation in telecommunication applications.