BS EN 61811-50:2002

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.

IEC 61811-50:2002 Is a sectional specification applicable to electromechanical all-or-nothing telecom relays of assessed quality. Selects the appropriate methods of test to be used in detail specifications and contains basic test schedules to be used in the preparation of such specifications.