BS 561:1951
Withdrawn
A Withdrawn Standard is one, which is removed from sale, and its unique number can no longer be used. The Standard can be withdrawn and not replaced, or it can be withdrawn and replaced by a Standard with a different number.
Specification for alternating-current line relays double-element 3-position (for railway signalling)
Hardcopy , PDF
07-08-2014
English
06-15-1951
Co-operating organizations
Foreword
Specification
1 Scope
2 Definitions
3 General requirements
4 Dimensions
5 Mounting
6 Mechanical clearances
7 Bearings
8 Coils
9 Contacts
10 Contact capacity
11 Contact clearances
12 Contact rating
13 Contact pressure
14 Contact resistance
15 Flexible connections
16 Terminals
17 Terminal markings
18 Insulation
19 Insulation tests
20 Operating values (a) Pick-up
(b) Drop away
21 Finish
22 Labelling and marking
23 Pointer scale
Appendix
Information to be supplied by the purchaser
Information to be supplied by the manufacturer
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