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NR BR 939

Specification for Miniature Tractive Armature AC Immune DC Neutral Track Relay, Plug-In Type for Railway Signalling Purposes

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Organization: NR
Publication Date: 1 June 1977
Status: active
Page Count: 30
scope:

This specification relates to design requirements for miniature tractive armature A.C. immune D.C. neutral track relays of the plug-in type for use in railway signalling circuits

Document History

NR BR 939
June 1, 1977
Specification for Miniature Tractive Armature AC Immune DC Neutral Track Relay, Plug-In Type for Railway Signalling Purposes
This specification relates to design requirements for miniature tractive armature A.C. immune D.C. neutral track relays of the plug-in type for use in railway signalling circuits

References

This document is referenced by:
NR BR 933 - Specification for Miniature Tractive Armature AC Immune DC Slow Pick-Up Neutral Line Relay, Plug-In Type for Railway Signalling Purposes
Published by NR on May 1, 1977
This specification relates to the design requirements of miniature tractive armature D.C slow pick-up neutral line relays for use in railway signaling circuits, irrespective of the presence in the...
This document is referenced by:
NR BR 932 - Specification for Miniature Tractive Armature AC Immune DC Biased Neutral Line Relay, Plug-In Type for Railway Signalling Purposes
Published by NR on May 1, 1977
This specification relates to design requirements for miniature tractive armature D.C. biased neutral line relays of the plug-in type for use in railway signalling circuits irrespective of the...
This document is referenced by:
NR RT/E/PS/11755 - DC Track Circuits (aka NR/PS/SIG/11755)
Published by NR on December 1, 2000
The contents of this Product Specification apply to both new and existing d.c. track circuit installations, and shall be read in conjunction with RT/E/S/11752. The following types of track circuit...
This document is referenced by:
NR BR 930 - Specification For Miniature Tractive Armature DC Neutral Line Relay (Plug-In Type) for Railway Signalling Purposes
Published by NR on November 1, 1985
GENERAL The relays covered by this specification are for general railway signalling purposes, i.e. line circuits, control circuits etc. where special characteristics such as a.c. immunity, slow...
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