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   Relays, General Purpose

A relay is an electrical switch that opens and closes under control of another electrical circuit. In the original form, the switch is operated by an electromagnet to open or close one or many sets of contacts. It was invented by Joseph Henry in 1835. Because a relay is able to control an output circuit of higher power than the input circuit, it can be considered, in a broad sense, to be a form of electrical amplifier.

These contacts can be either Normally Open (NO), Normally Closed (NC), or change-over contacts.

  • Normally-open contacts connect the circuit when the relay is activated; the circuit is disconnected when the relay is inactive. It is also called Form A contact or "make" contact. Form A contact is ideal for applications that require to switch a high-current power source from a remote device.
  • Normally-closed contacts disconnect the circuit when the relay is activated; the circuit is connected when the relay is inactive. It is also called Form B contact or "break" contact. Form B contact is ideal for applications that require the circuit to remain closed until the relay is activated.
  • Change-over contacts control two circuits: one normally-open contact and one normally-closed contact with a common terminal. It is also called Form C contact.


Bronze Partners
ABB Inc.
Advance Controls, Inc.
Aleph International Corp.
Allen-Bradley
Allen-Bradley
Allied Controls Acquisition Corp.
Altech Corp.
Amecon, Inc.
American Control Products
American Electronic Components
American Relays, Inc.
American Zettler
Americor Electronics, Ltd.
Amperite Co.
Aromat Corp. (Matsushita Electric Works, America)
B & J - USA
Babcock, Inc.
Brentek International, Inc.
Cabur Srl
Carlo Gavazzi Automation Components
Chauvin Arnoux, Inc.
Chief Enterprises Inc
CII Products
CIT Relay and Switch
Clare Inc.
Cole Hersee Company
Continental Industries Inc.
Coto Technology
Cougar Electronics Corp.
Crouzet
Crydom
Custom Industrial Mfg., Inc.
CyberResearch, Inc.
Danaher Controls
DARE Electronics, Inc.
Data Panel Corporation
Deltrol Controls
Deutsch Relays, Inc.
EI & S Elctrn. Instrs. & Spec. Div.
Electrodyne, Inc.
Electronic Specialty Corp
Electronika Intl. Inc.
Excel Cell Electronic (USA) Corp.
Finder Relays Inc.
Fuji Electric Corp. of America
Fujitsu Components America, Inc.
GIGAVAC
Global Components & Controls
Goodman Components Corp.
Grayhill Inc.
Greenwich Electronics
Guardian Electric Mfg. Co.
Hamlin
Hasco Components International Company
High Tech Connections
ICS, Inc.
IDEC Corp.
Inmark Corporation
Jaidinger Mfg. Co., Inc.
Jennings Technology Corp.
Kuhnke Automation Inc.
Leach International
Line Electric Products
Magnecraft
Master Electronic Controls (MEC)
MEDER electronic Inc.
Midtex Products
Murrelektronik
NEC Electronics Corporation
Ningbo Forward Relays Corp Ltd
NTE Electronics, Inc.
Omega Engineering Inc.
Omron Electronics LLC
Opto 22
Pace Electronics
Philips ECG
Phoenix Contact Inc.
Picker Components
Pontiac Coil-Arkansas
Relay Service Company
RFE International, Inc.
Robert Bosch Corporation
Rockwell Automation
Ross Engineering Corp.
Rsm Sensitron Semiconductor
Schrack Components, Inc.
Sky Electronics, Intl.
Solid State Electronics Corp.
Solid State Optronics
Song Chuan USA, Inc.
Spectron Glass & Electronics Inc.
SPEMCO Switches
SRC Devices
Stancor
Stetron International, Inc.
Sumida America
T-Bar Inc.
Teledyne Relays
Time Mark Corp.
Triridge Corp.
TURCK Inc.
Tyco Electronics Corp.
Universal Relays
V R Industries, Inc.
Ventronics, Inc.
Waldom Electronics Inc.
Weidmuller Inc.
Wieland Electric Inc.
Fixed and programmable amplifiers - Frequency Devices

 

Books
The 2006-2011 World Outlook for General-Purpose Electromechanical Relays and Relays for Electronic Circuitry, Industrial Control Overload, and Switchgears

The 2006-2011 World Outlook for General-Purpose Electromechanical Relays and Relays for Electronic Circuitry, Industrial Control Overload, and Switchgears

The 2006-2011 World Outlook for General-Purpose Electromechanical Relays

The 2006-2011 World Outlook for General-Purpose Electromechanical Relays

The Generals' War : The Inside Story of the Conflict in the Gulf
Michael R. Gordon and General Bernard E. Trainor

Massachusetts General Hospital Psychiatry Update and Board Preparation
Massachusetts General Hospital, Theodore Stern, and John B., M.D. Herman

With Napoleon in Russia: The Memoirs of General de Caulaincourt Duke of Vicenza
General De Caulaincourt and Jean Hanoteau

Enterprise Operations Management Handbook, Second Edition
Steve Blanding

Excerpt - page 222: "... TRANSFER MODE Asynchronous Transfer Mode (ATM), also known as cell relay, is a general- purpose switching method for multimedia (e.g., voice, data, image, and video). ..."
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Electronic Technology Handbook
Neil Sclater

Excerpt - page 52: "... contacts ^ Packaging style and form factor ^ Application The general classifications for electromechanical relays are: ^ General-purpose relays ^ Power relays ^ Sensitive relays ^ Telephone-type relays ..."
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Tab Electronics Guide to Understanding Electricity and Electronics
G. Randy Slone

Excerpt - Back Cover: "... Flasher Soldering Iron Controller Logic Probes and Pulser Light- Activated Relay General-Purpose Battery Charger Lab-Quality Audio Amplifier And Many Others ISBN 0-D7-136057-3 ..."
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Industrial Automation: Circuit Design and Components
David W. Pessen

Excerpt - page 130: "... during each ac cycle, which extinguishes the arc. If the relay actuates incandescent lamps, the contacts ... 10 times the steady-state current. General-purpose relays can be expected to last at least 100,000 operations ..."
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Probability Applications in Mechanical Design (Mechanical Engineering (Marcell Dekker))
Franklin Fisher

Excerpt - Back Matter: "... liquid oxygen 7.78 3.00 0.96 Regulators, pneumatic 6.21 2.40 0.77 Relays, general-purpose 0.48/cs 0.25/cs 0.10/cs Resistors, carbon deposit 0.57 0.25 0.11 Resistors, ..."
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A History of Computing Technology, 2nd Edition
Michael R. Williams

Excerpt - page 230: "... just indicated. These machines were known as the Bell Laboratories General Purpose Relay Calculators, or Model V for short. The Model V was ..."
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Intruder Alarms, Second Edition
Gerard Honey

Excerpt - page 171: "... supply for the lighting through the main contacts. 6.3 Electromagnetic relays: applications In Section 2.3. we ... Within the security industry in general these devices are used widely ... into two categories for our purposes. In the main category there are four particular subclassifications of ..."
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A History of the Personal Computer: The People and the Technology
Roy A. Allan

Excerpt - page 3: "... and S. B. Williams designed the calculator using 450 telephone relays and 10 crossbar switches. The ... known as the Bell Laboratories General Purpose Relay Calculator in 1946. It contained over 9,000 relays. An ..."
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Electrical Power Systems Technology, Second Edition
Dale Patrick and Stephen Fardo

Excerpt - page 388: "... or more solenoids to control the flow of water. Specialized Relays There are many types of relays used for electrical power control. General-purpose relays are used for low-power applications. They are relatively inexpensive ..."
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The Design Warrior's Guide to FPGAs (Edn Series for Design Engineers)
Clive "Max" Maxfield

Excerpt - page 349: "... those vendors). 1943: Germany. Konrad Zuse starts work on his general-purpose relay-based computer called the Z4. 1944: America. Howard Aiken and team ..."
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Manufacturing Systems Engineering
Katsundo Hitomi

Excerpt - page 345: "... and further in H.H. Aiken's Automatic Sequence-Controlled Calculator, using electro-magnetic relays, in 1944. The general-purpose electronic computer having a fixed stored program and the most ..."
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Connecting Microsoft Exchange Server (HP Technologies)
Kieran McCorry

Excerpt - page 197: "... resolution or whether you wish to forward mail to a general purpose relay host. If you only intend to use this IMS for ..."
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History of Nordic Computing: IFIP WG9.7 First Working Conference on the History of Nordic Computing (HiNC1), June 16-18, 2003, Trondheim, Norway (IFIP ... Federation for Information Processing)
Janis Bubenko, John Impagliazzo, and Arne Solvberg

Excerpt - page 96: "... see G Kjellberg and G Neovius, "The BARK: A Swedish General Purpose Relay Computer", Mathematical Tables and other Aids to Computation, January 1951, ..."
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42 V-PowerNets
Hennig Wallentowitz and Christian Amsel

Excerpt - page 118: "... decreases the current rating of standard 14 VDC double break relays by a factor of 2/3. ... we used the tyco small general purpose relay (SNR; gap 0.2 mm), to study the influence of ..."
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Noise Reduction Techniques in Electronic Systems, 2nd Edition
Henry Ott

Excerpt - page 207: "... dry-circuit conditions but erode excessively at high currents. Many so-called "general purpose relays" are on the market, rated from dry circuit to 2 ..."
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Electronic Protection and Security Systems, Second Edition: A Handbook for Installers and Users
Gerard Honey

Excerpt - page 177: "... with the heads covered by the sounder enclosure. 7.2 Electromagnetic relay selection Electromagnetic relays can be ... are four particular classifications: >General purpose relays: Here the contacts turn on instantaneously when the coil ..."
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A History of Computing in the Twentieth Century: A Collection of Papers
Los Ala International Research Conference on the History of Computing

Excerpt - page 119: "... "Gentlemen, for $50,000 1 think I can build you a general-purpose relay calculator." The general response was, "Gee, who wants to spend ..."
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The Computer Revolution in Canada: Building National Technological Competence (History of Computing)
John N. Vardalas

Excerpt - Back Matter: "... year (Doran Kjellberg and Gosta Neovius, 'The BARK, A Swedish General Purpose Relay Computer," Mathematical Tables and Other Aids to Computation 5, 1951: ..."
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Locksmithing and Electronic Security Wiring Diagrams
John L. Schum

Excerpt - page 81: "... in your circuit turns electricity on or off to the relay coil. The best way to ... on what we'll call the general-purpose relay. This is the type of relay that you. are ..."
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Reorganizing the Factory: Competing Through Cellular Manufacturing
Nancy Hyer and Urban Wemmerlov

Excerpt - page 119: "... Wisconsin-Madison to see if cells could be applied to the general-purpose relay product line.21 This product line included over 200 relay models. ..."
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A Bibliographic Guide to the History of Computing, Computers, and the Information Processing Industry (Bibliographies and Indexes in Science and Technology)
James W. Cortada

Excerpt - page 219: "... 1541 Kjellberg, G. and Neovius, G. "The BARK, A Swedish General Purpose Relay Computer," Mathematical Tables and Other Aids to Computation 5 (1951): ..."
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Security Electronics Circuits Manual (Newnes Circuits Manual)
R M MARSTON

Excerpt - page 164: "... ended prematurely by briefly closing S2, thus turning off both relays. The circuit's timing period can, ... can thus be almost any general-purpose relay, but that RLB's contacts have to pass the full ..."
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Passive Electronic Component Handbook
Charles A. Harper

Excerpt - page 261: "... PASSIVE COMPONENT HANDBOOK Coil frant spool head FIGURE 4.12 A relay commonly referred to as general purpose.' Stationary (make) contact spring (a fixed contact spring) (Left-hand ) ..."
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Building Scientific Apparatus
John H. Moore, Christopher C. Davis, Michael A. Coplan, and Sandra C. Greer

Excerpt - page 438: "... parameters are the operating voltage and power rating of the relay as well as the contact rating. The speed at which mechanical relays operate is generally in the 10 to 100 ms range. General-purpose electromagnetic relays operate at 6, 12, 24, 48, and 110 ..."
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Protocols and Systems for Interactive and Distributed Multimedia
Fernando Boavida, Edmundo Monteiro, and Joao Orvalho

Excerpt - page 87: "... is constituted con- sisting of an embedded CPU and four relay-controlled general purpose power supply outlets for switching on and off connected devices. ..."
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Radiant Floor Heating
R. Dodge Woodson

Excerpt - page 118: "... the relay terminals. If any of these components fail, a relay can become useless. Contacts are ... There are time-delay relays and general-purpose relays that might be used in a heating system. A ..."
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The Forrest Mims Circuit Scrapbook
Forrest Mims

Excerpt - page 143: "... Experimenting with a Touch Tone DTMF Receiver Fig. 6-11. Relay interface for general-purpose RC amplifier. 220). By installing the optoisolator and R1 on ..."
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Modern Hydronic Heating for Residential and Light Commercial Buildings, 2E
Siegenthaler

Excerpt - page 271: "... the schematic symbols for the coil and contacts for the relays commonly used in heating control systems. General Purpose Relays Some control systems require one or more relays to ..."
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Understanding Data Communications: From Fundamentals to Networking, 3rd Edition
Gilbert Held

Excerpt - page 746: "... packet network? 13. Discuss the differences between X.25 and frame relay with respect to the network access methods and operating rates, error handling and throughput delays. 14. What is the general purpose or goal of a Frame Relay Forum Implementation Agreement (IA)? ..."
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Electronic Filters, Amplifiers & Oscillators - Frequency Devices
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