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   Relays, Meter

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
A & D Electric Instruments
Amecon, Inc.
Arga Controls
Beede Electrical Instrument Company, Inc.
Carlo Gavazzi Automation Components
Clare Inc.
Coto Technology
Electro-Numerics Inc.
Fox Meter Inc.
International Instruments
Laurel Electronics, Inc.
Master Electronic Controls (MEC)
Newport Electronics
OakTec, Inc.
OTEK Corp.
Selco Products
Simpson Electric Inc.
Texmate Inc
Triplett Corp.
Weschler Instruments
Fixed and programmable amplifiers - Frequency Devices

 

Books
Athletics, Track: 100 Meters, 200 Meters, Relays, Hurdles, & Lots, Lots More (Page, Jason. Zeke's Olympic Pocket Guide.)
Jason Page

Relays heat up on scorching day.(Sports)(An Oregon team gives the favorites from Georgia a run for their money in the 4x800-meter relay): An article from: The Register-Guard (Eugene, OR)

Exploiting your 400-meter relay personnel: (don't overlook the intangibles).: An article from: Coach and Athletic Director
Dennis Best

An Olympian's oral history: Melvin Patton, 1948 Olympic Games, 200 meters, 4 x 100-meter relay
Mel Patton

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

Excerpt - page 58: "... is put into operation, since the results produced by the relays and meters depend on how well the CT behaves under normal and ..."
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Measuring Current, Voltage and Power (Handbook of Sensors and Actuators)
K. Iwansson, G. Sinapius, W. Hoornaert, and S. Middelhoek

Excerpt - page 193: "... e g. 261114 Mechanical counter The mechanical counter in the meter accumulates the number of consumed ... step round to zero again Relay A relay in the meter is used to control external ..."
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Run Strong
Kevin Beck

Excerpt - page 48: "... in the late 1980s, focusing on the 400 and 800 meters. She was a solid runner, garnering NCAA Division II All-American honors in the 4 X 400-meter relay, 800 meters, and 1,500 meters in her senior year. When ..."
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AP Stylebook
Associated Press

Excerpt - page 300: "... formal title before a name. See titles in main section. meter relay, women's 100-meter backstroke, etc., on first refer- ence. Condense to ..."
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Getting Started in Electronics
Forrest M. Mims III

Excerpt - page 102: "... 1 5v0 2 ,.., _. O-1 w, A It, G RELAY ` METER 2 RL ~---o SPORT WIRE 1 M Q1 S "ANTENNA ..."
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World Almanac and Book of Facts (2006) (World Almanac and Book of Facts (Paper))
World Almanac

Excerpt - page 863: "... ..... 47.635 1936 Gunnar Hocked, Finland .......... ..... 14m. 22.2s 400-Meter Relay 1948 Gaston Reiff, Belgium ............ ..... 14m. 17.6& .......... . ..."
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The Power of Focus: How to Hit Your Business, Personal and Financial Targets with Absolute Certainty
Jack Canfield, Mark Victor Hansen, and Les Hewitt

Excerpt - page 221: "... She won a bronze medal in the 4 x 4 relay. But this was only the start. On September 7, 1960, in Rome, Wilma became the first American woman to win three gold medals in the Olympics. She won the 100-meter dash, the 200-meter dash, and ran the anchor on the ..."
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The Law Of Torts: Examples And Explanations (Examples & Explanations)
Joseph W. Glannon

Excerpt - page 31: "... you run Ashford on the anchor leg of the women's four-hundred-meter relay tomorrow, I'll see that you never walk again." Is this ..."
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The Divided Mind: The Epidemic of Mindbody Disorders
John E. Sarno

Excerpt - page 242: "... world, Mr. Glickman had been scratched from the 4 x 100-meter relay event because he was Jewish and the desire by Avery ..."
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The Zone: A Dietary Road Map to Lose Weight Permanently : Reset Your Genetic Code : Prevent Disease : Achieve Maximum Physical Performance
Barry Sears

Excerpt - page 47: "... that summer, she took a silver medal in the 100- meter freestyle and two gold medals as anchor in the 400-meter medley and 400-meter freestyle relays. "Some people were saying that Jenny must have been doing ..."
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Embedded Systems Architecture: A Comprehensive Guide for Engineers and Programmers
Tammy Noergaard

Excerpt - Back Matter: "... physical actions, commonly found in flow-control valves, motors, pumps, switches, relays and meters. Adder A hardware component that can be found in a ..."
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The Whartons' Stretch Book
Jim Wharton and Phil Wharton

Excerpt - page 220: "... gold medal as a member of the 4 x 100 meters relay team at Barcelona, competed in a meet in Sicily at ..."
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Victory over the Darkness
Neil T. Anderson

Excerpt - page 108: "... in Australia and won a bronze medal for anchoring the 400-meter relay team. Not satisfied with her accomplishment, she worked diligently for ..."
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The Scribner Anthology of Contemporary Short Fiction: Fifty North American American Stories Since 1970
Michael Martone, Lex Williford, and Rosellen Brown

Excerpt - page 46: "... the fifty-yard dash. And tomorrow I'm subject to run the quarter-meter relay 46 ..."
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Messy Spirituality
Mike Yaconelli

Excerpt - page 105: "... desire, Lisa became the anchor runner on the girls' 1500 meter relay team. Because her school boasted the only girls' 1500 relay ..."
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Freedom from Fear: The American People in Depression and War, 1929-1945 (Oxford History of the United States)
David M. Kennedy

Excerpt - page 427: "... medals in the track and field events: for the loo-and aoo-meter dashes, the broad jump, and as a member of the 4oo-meter relay team. Hitler conspicuously refused to shake Owens's hand, or the ..."
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Mastering the Zone: The Next Step in Achieving SuperHealth and Permanent Fat Loss
Barry Sears

Excerpt - page 305: "... Trials in June, he dropped a full second off his 400-meter times to make the team. The ending to his story was a gold medal in the 4 x 400-meter relay. And there is Sinjin Smith, a legend in beach volleyball, ..."
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Mazda Miata Enthusiasts Manual
R Grainger

Excerpt - page 173: "... ENGINE COMPARTMENT). FUSE AMPS PROTECTED CIRCUIT ENGINE 15A EGI main relay and cooling fan relay METER 10A Instrument panel, turn signal switch. (Timer and buzzer unit, ..."
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National Electrical Code 2002 Handbook (National Fire Protection Association//National Electrical Code Handbook)
NFPA

Excerpt - page 447: "... Clearance for Conductors Entering Bus Enclosures 408.12 Grounding of Instruments, Relays, Meters, and Instrument Transformers on Switchboards III. Panelboards 408.13 General 408.14 ..."
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Communicating Change: Winning Employee Support for New Business Goals
T. J. Larkin and Sandar Larkin

Excerpt - page 177: "... job. The FCC in its investigation found: A miscalibrated safety relay-meter caused the initial failure to the in- house generators. The ..."
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Audel Guide to the 2005 National Electrical Code
Paul Rosenberg

Excerpt - page 199: "... volts to ground and they are used exclusively for current meters. 250.174: Cases of Instruments, Meters, and Relaysrating at Less Than 1000 Volts Any instruments, relays, or meters ..."
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An Introduction to Mixed-Signal IC Test and Measurement (The Oxford Series in Electrical and Computer Engineering)
Mark Burns and Gordon W. Roberts

Excerpt - page 530: "... of the two schemes, we can see why the local relay may be superior in many ... '-------------------------------- D-- instruments matrix relay (meters, p DC sources, etc.) Long lines (susceptible to interference) ------------------------------------- ..."
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Of Beetles and Angels: A Boy's Remarkable Journey from a Refugee Camp to Harvard
Mawi Asgedom

Excerpt - page 115: "... I ran the anchor leg on our all-state 4 x 800-meter relay team. We won our conference championship and competed in the ..."
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The Mental Edge
Kenneth Baum

Excerpt - page 28: "... real and imagined events. When you picture yourself swimming the 100-meter relay or kicking a 45-yard field goal through the uprights, the ..."
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My Century: A Novel
Gunter Grass

Excerpt - page 154: "... right after the gold-Hary was also part of the winning 4oo-meter relay team-the press were shown eight Puma models with his name, ..."
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The Mcdougall Program for Maximum Weight Loss
John A. McDougall and Mary McDougall

Excerpt - page 7: "... perience with others, including his teammates on the world- record-setting 4x100-meter relay team. In the interview with Runner's World, Carl said, "I ..."
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Flu: The Story Of The Great Influenza Pandemic
Gina Kolata

Excerpt - page 92: "... of the year in his high school, running sprints and 400-meter relays, throwing the discus, and also competing in the high jump. ..."
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The Complete Waterpower Workout Book: Programs for Fitness, Injury Prevention, and Healing
Lynda Huey and Robert Forster

Excerpt - page 156: "... on that broken foot, won a gold medal in the 400-meter relay, then had a cast placed on her foot after the ..."
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Don Nehlen's Tales from the West Virginia Sideline
Don Nehlen and Shelly Poe

Excerpt - page 94: "... gold medalist that we ever had. He ran on the 100-meter relay team in the Barcelona Olympics in 1992. That was before ..."
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Complete Idiot's Guide to Body Language (The Complete Idiot's Guide)
Peter Andersen

Excerpt - page 267: "... her sponsor. Similarly, after breaking a world record in the 400-meter relay in the 2000 Olympics, the U.S. team consisting of Jon ..."
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Handbook of Electric Power Calculations
H. Wayne Beaty

Excerpt - page 350: "... the three-phase leads and the residual, are taken to the relay and instrument location. The three-phase currents are fed to protective relays or meters, which are connected in series. After these, the phases are ..."
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The American People in the Great Depression: Freedom from Fear, Part One (The Oxford History of the United States, V. 9)
David M. Kennedy

Excerpt - page 427: "... medals in the track and field events: for the loo-and zoo-meter dashes, the broad jump, and as a member of the 40o-meter relay team. Hitler conspicuously refused to shake Owens's hand, or the ..."
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