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BS 561:1951
M00000501
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BS 561:1951 Specification for alternating-current line relays double-element 3-position (for railway signalling)
standard by BSI Group, 06/15/1951
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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.Cross References:
BS 442