NBN EN 61811-51 : 2002

1 General
  1.1 Scope
  1.2 Normative references
  1.3 Front page of the detail specification
2 Characteristic values of the relay
  2.1 General data
  2.2 Construction of IECQ type
      designation (ordering information)
  2.3 Coil data
  2.4 Contact data
      2.4.1 Electrical endurance and switching frequency
      2.4.2 Static contact-circuit resistance
      2.4.3 Mechanical endurance
      2.4.4 Timing (without suppression device)
  2.5 Mounting
  2.6 Environmental data
  2.7 Package of relays for automatic
      handling (if applicable)
3 Qualification approval procedures
4 Quality conformance inspection
  4.1 Formation of inspection lots
  4.2 Intervals between tests
5 Marking and documentation
  5.1 Marking of the relay
  5.2 Marking of the package
  5.3 Documentation
6 Annexes
7 Tests
  7.1 Standard conditions for testing
  7.2 Mounting of test specimens during the test
  7.3 General conditions for testing
8 Ordering information
9 Relay reliability - failure rate data (optional)
Annex ZA (normative) Normative references to international
                     publications with their corresponding
                     European publications

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