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BS 561

51st Edition, June 15, 1951

Complete Document

Specification for Alternating-current line relays double-element 3-position (for railway signalling)

Includes all amendments and changes through Reaffirmation Notice , December 15, 1980


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Product Details:

  • Revision: 51st Edition, June 15, 1951
  • Published Date: December 15, 1980
  • Status: Not Active, See comments below
  • Document Language: English
  • Published By: British Standards Institution (BSI)
  • Page Count: 12
  • ANSI Approved: No
  • DoD Adopted: No

Description / Abstract:

2-element, 3-position relays for railway signalling circuits up to 250 volts. Mounting, mechanical clearances, bearings, coils, contact capacity, contact pressure, contact resistance, flexible connections, terminals and terminal markings, insulation tests, pick-up and drop away values, labelling and marking, finish, pointer scale.