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A symbolic analysis of relay and switching circuits

Open access
Shannon, Claude E.·1938·Transactions of the American Institute of Electrical Engineers

Abstract

In the control and protective circuits of complex electrical systems it is frequently necessary to make intricate interconnections of relay contacts and switches. Examples of these circuits occur in automatic telephone exchanges, industrial motor-control equipment, and in almost any circuits designed to perform complex operations automatically. In this article a mathematical analysis of certain of the properties of such networks will be made. Particular attention will be given to the problem of network synthesis. Given certain characteristics, it is required to find a circuit incorporating these characteristics. The solution of this type of problem is not unique and methods of finding those particular circuits requiring the least number of relay contacts and switch blades will be studied. Methods will also be described for finding any number of circuits equivalent to a given circuit in all operating characteristics. It will be shown that several of the well-known theorems on impedance networks have roughly analogous theorems in relay circuits. Notable among these are the delta-wye (δ-Y) and star-mesh transformations, and the duality theorem.

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Metadata

Authors
Shannon, C. E.
Venue
Transactions of the American Institute of Electrical Engineers
Published
1938-12
Volume
57
Issue
12
Pages
713-723
ISSN
0096-3860 (ISSN-L)
OpenAlex
W2053619330
Cited by
1,012
References
1
FWCI
0.00
Type
journal article
Language
en
Open access
green

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CoChat. (2026). Citation check: A symbolic analysis of relay and switching circuits. https://app.cochat.ai/papers/10.1109/t-aiee.1938.5057767
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Shannon, C. E. (1938). A symbolic analysis of relay and switching circuits. Transactions of the American Institute of Electrical Engineers. https://doi.org/10.1109/t-aiee.1938.5057767

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Contains information from the Semantic Scholar Academic Graph Datasets, made available under the ODC Attribution License (ODC-BY 1.0).

Semantic Scholar’s data is described in: Kinney, R., et al. (2023). The Semantic Scholar Open Data Platform. arXiv:2301.10140.