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   Relays, Plug-In

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
Allen-Bradley
Allied Controls Acquisition Corp.
Altech Corp.
Amecon, Inc.
American Control Products
American Zettler
Americor Electronics, Ltd.
AMETEK Panalarm
Amperite Co.
Aromat Corp. (Matsushita Electric Works, America)
B & J - USA
Babcock, Inc.
Brentek International, Inc.
BTC Electronic Components
Cabur Srl
Carlo Gavazzi Automation Components
Chauvin Arnoux, Inc.
Chief Enterprises Inc
CII Products
CIT Relay and Switch
Clare Inc.
Continental Industries Inc.
Coto Technology
Cougar Electronics Corp.
Crouzet
Custom Industrial Mfg., Inc.
Danaher Controls
DARE Electronics, Inc.
Deltrol Controls
Deutsch Relays, Inc.
EAC Electronics Co.
Electro National Corp.
Electrodyne, Inc.
Electronic Specialty Corp
Eurocomp, Inc./Camden
Finder Relays Inc.
Fujitsu Components America, Inc.
Global Components & Controls
Grayhill Inc.
Greenwich Electronics
Guardian Electric Mfg. Co.
Hartman Products
Hasco Components International Company
Hella Incorporated
High Tech Connections
Hoyt Electrical Inst. Works, Inc.
ICS, Inc.
IDEC Corp.
Kuhnke Automation Inc.
Leach International
Line Electric Products
Magnecraft
Master Electronic Controls (MEC)
Midtex Products
Mode Electronics Ltd.
NEC Electronics Corporation
North Atlantic Industries
NTE Electronics, Inc.
Omron Electronics LLC
Opto 22
Philips ECG
Phoenix Contact Inc.
Picker Components
Pontiac Coil-Arkansas
Production Devices, Inc.
Relay Service Company
Robert Bosch Corporation
Rockwell Automation
Sharp Microelectronics of the Americas
Sky Electronics, Intl.
Solid State Electronics Corp.
Song Chuan USA, Inc.
SPEMCO Switches
Stetron International, Inc.
Teledyne Relays
Tyco Electronics Corp.
V R Industries, Inc.
Western Reserve Controls
Fixed and programmable amplifiers - Frequency Devices

 

Books
The 2000 Import and Export Market for Electrical Apparatuses Such As Switches, Relays, Fuses, and Plugs in N. America & Caribbean (World Trade Report)
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The 2000 Import and Export Market for Electrical Apparatuses Such As Switches, Relays, Fuses, and Plugs in Europe (World Trade Report)
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The 2000 Import and Export Market for Electrical Apparatuses Such As Switches, Relays, Fuses, and Plugs in Africa (World Trade Report)
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The 2000 Import and Export Market for Electrical Apparatuses Such As Switches, Relays, Fuses, and Plugs in Asia (World Trade Report)
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Daniel Minoli

Excerpt - page 64: "... equipment. Hence, (1) the availability of a public switched frame relay service, and (2) the addition of frame relay interface capability to user's equipment (usually with a plug-in card plus appropriate software) will facilitate LAN interconnection over a ..."
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How to Tune and Modify Engine Management Systems (Motorbooks Workshop)
Jeff Hartman

Excerpt - page 78: "... is not compatible with ECU. Bad ECU. Check connections, fuses, relays, plug wires. ECU not receiving an rpm signal from the ignition ..."
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Voice over Frame Relay
William A. Flanagan

Practical Power System Protection
Leslie Hewitson, Mark Brown, and Ramesh Balakrishnan

Excerpt - page 98: "... disk has to travel before contact is made. 9.2.1 Current (plug) pick-up setting This setting determines the level of current at which the relays will pick-up or its disk will start to rotate. BS ..."
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Pilot's Handbook of Aeronautical Knowledge: FAA-H-8083-25, December 2003 (FAA Handbooks series)
Federal Aviation Administration

Excerpt - page 83: "... External External Power _ Power Relay _ Plug I --r- I _ + I 1 I I I ..."
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Hard Landing: The Epic Contest for Power and Profits That Plunged the Airlines into Chaos
Thomas Jr Petzinger

Excerpt - page 59: "... join in. Together the companies developed a phalanx of switches, relays, and plugs, which they called "the brain." This room-sized device in turn ..."
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Pontiac GTO Restoration Guide, 1964-1972 (Motorbooks Workshop)
Paul Zazarine

Excerpt - page 137: "... lead was grounded to the top screw holding the horn relay to the firewall. The black ... to the horn relay. The plug wires were retained by plug wire brackets (part number 9793050 ..."
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Radiant Floor Heating
R. Dodge Woodson

Excerpt - page 118: "... apart and return to their open position. There are time-delay relays and general-purpose relays that might ... to different modes. Time-delay relays plug into sockets just as general-purpose relays do. The purpose of ..."
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Modern Hydronic Heating for Residential and Light Commercial Buildings, 2E
Siegenthaler

Excerpt - page 272: "... #3 coil Figure 9-34 (a) Relay socket for a 3PDT plug-in relay. Note numbers and letters designating terminals. (b) 3PDT plug-in relay ..."
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The Car Care Book (Car Care Book)
Ronald G Haefner

Excerpt - page 121: "... flash, the most likely cause is a defective turn-signal flasher relay. A flasher relay is a plug-in unit that can be removed and replaced easily. Check your ..."
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Mazda Miata 1800: Enthusiast Shop Manual
Rod Grainger

Excerpt - page 147: "... remove the cover to gain access to the fuel pump relay. The exact appearance of the ... off the ignition switch and plug the relay back into the connector, then refit the inspection ..."
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Technician's Guide to Refrigeration Systems
John A. Corinchock

Excerpt - page 409: "... that it takes until the sensor closes. Control box and relay. A multifunction, three-pole, double-throw relay plugs into a receptacle on the printed circuit board in the ..."
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Rule of Evidence
John G. Hemry

Excerpt - page 100: "... his left temple offered Paul some pieces of equipment. "Emergency relays. Plug one into the jack inside the airlock and the other ..."
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Aircraft Inspection, Repair & Alterations: Acceptable Methods, Techniques, and Practices (FAA Handbooks series)
Federal Aviation Administration

Excerpt - page 311: "... essential to maintain proper phase sequencing. For any application involving plug-in relays, proper engagement of their retaining mechanism is vital. (2) The ..."
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HTI+ Home Technology Integration All-in-One Exam Guide (All-in-One)
Ron Gilster, Helen Heneveld, and Ron Price

Excerpt - page 480: "... into the PLC module. mmer PLC lamp modules that plug into an electrical outlet are used to provide dimmer control of table lamps and other lamps that can be plugged into an AC outlet on the module. >Relay PLC appliance modules can be used to control the on/off ..."
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Fuel Injection: Installation, Performance Tuning, Modification (Motorbooks International Powerpro)
Jeff Hartman

Excerpt - page 112: "... system not compatible with ECU. Bad ECU. Check: Connections, fuses, relays, plug wires. ECU is not receiving an rpm signal from the ..."
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Mazda Miata Enthusiasts Manual
R Grainger

Excerpt - page 3: "... the cover to gain access to the fuel circuit opening relay. On our UK market project ... off the ignition switch and plug the relay back into the connector, then refit the inspection ..."
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Electric Power Distribution (McGraw-Hill Professional Engineering)
A. S. Pabla

Excerpt - page 739: "... distance from the power source increases. The characteristics of this relay are such that its operating time is approximately doubled for a reduction in current from 7 to 4 times the relay plug multiplier setting. This permits use of the same time multiplier ..."
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Yamaha Fzr 600 1989 1993
Ed Scott

Excerpt - page 264: "... the inside of the tire and to apply a combination plug/patch from the inside. Don't rely ... and heat. Repair Do not relay on a plug or cord patch applied from outside the ..."
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Handbook for Sound Engineers, Third Edition
Glen Ballou

Excerpt - page 307: "... and spacing, depending on the current carrying capacity. Octal Sockets. Plug into standard 8 pin and ... socket. OTNV = 0 DIP Relays. Designed to mount directly on a printed circuit board on ..."
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Machine Cryptography and Modern Cryptanalysis (Artech House Telecom Library)
Cipher A. Deavours and Louis Kruh

Excerpt - page 3: "... clever arrangements of rotors, gears, cogs, switches, relays, and plug boards. That was a time when brilliant men raised cryptography ..."
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Language and the Pursuit of Happiness
Chalmers Brothers

Excerpt - page 78: "... Language and the Pursuit of Happiness mechanic may see spark plugs, the fuse relay center, the fuel solenoid, a fuse block busbar, electronic fuel ..."
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The God Chip Conspiracy
Thomas J. Sanders

Excerpt - page 19: "... the net. You may select audio only, activate the holovision relays, or plug in for full psidee capabilities. For your convenience all advertising ..."
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