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BSI BS 561:1951

Specification for alternating-current line relays double-element 3-position (for railway signalling)
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BSI BS 561:1951

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

PUBLISH DATE 1951
PAGES 16
BSI BS 561:1951
REAFFIRMED IN 1980
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.
SDO BSI: British Standards Institution
Document Number 561
Publication Date June 15, 1951
Language en - English
Page Count 16
Revision Level
Supercedes
Committee GEL/9
Publish Date Document Id Type View
June 15, 1951 BS 561:1951 Revision
July 23, 1934 BS 561:1934 Revision