ElectronicDesignNet.com

The world of electronic design solutions

Frequency Devices
SOC Central
Electronics News, Product Guide, Forum and Community
Electronic Filters, Amplifiers & Oscillators - Frequency Devices
Fixed and programmable amplifiers - Frequency Devices

Register now to update your company and product listings (free)

   Relays, Motor Start

A contactor is a very heavy-duty relay used for switching electric motors and lighting loads. With high current, the contacts are made with pure silver. The unavoidable arcing causes the contacts to oxidize and silver oxide is still a good conductor. Such devices are often used for motor starters. A motor starter is a contactor with an overload protection devices attached. The overload sensing devices are a form of heat operated relay where a coil heats a bi-metal strip, or where a solder pot melts, releasing a spring to operate auxiliary contacts. These auxiliary contacts are in series with the coil. If the overload senses exess current in the load, the coil is de-energized.



Bronze Partners
Allen-Bradley
Allen-Bradley
Altech Corp.
American Electronic Components
American Zettler
Amperite Co.
Aromat Corp. (Matsushita Electric Works, America)
Carlo Gavazzi Automation Components
CIT Relay and Switch
Cougar Electronics Corp.
Crouzet
Custom Industrial Mfg., Inc.
Deltrol Controls
EHM Technology
Electronic Specialty Corp
Eurocomp, Inc./Camden
Fuji Electric Corp. of America
Fujitsu Components America, Inc.
Hasco Components International Company
Hella Incorporated
Jennings Technology Corp.
Leach International
Line Electric Products
Magnecraft
Master Electronic Controls (MEC)
Moeller Electric Corp
NEC Electronics Corporation
NTE Electronics, Inc.
Omega Engineering Inc.
Omron Electronics LLC
Philips ECG
Picker Components
Products Unlimited
Robert Bosch Corporation
Rockwell Automation
Sky Electronics, Intl.
Song Chuan USA, Inc.
Sprecher + Schuh
Stancor
Texas Instruments
Fixed and programmable amplifiers - Frequency Devices

 

Books
Solid-state Ac Motor Controls (Mechanical Engineering (Marcell Dekker))
Sylveste Campbell

Excerpt - page 16: "... line-starting squirrel cage induction motors. Referring to Figure 2.1 to start the motor, we push the Start button. Relay CR (the control relay) picks up and in turn causes ..."
See more references to Relays, Motor Start in this book.
Electric Relays (Electrical and Computer Engineering)
Vladimir Gurevich

Excerpt - page 30: "... "magnetic starters." They have been so named because originally such relays were designed for direct start up of asynchronous motors, and were also used in time delay relays with an ..."
See more references to Relays, Motor Start in this book.
Energy-Efficient Electric Motors, Third Edition (Electrical Engineering & Electronics)
Ali Emadi

Excerpt - page 19: "... the motor. Figure 1.13 illustrates an industrial-quality drip-proof single-phase capac- itor-start motor; note the centrifugally actuated switch ... such as current-sensitive and voltage-sensitive relays are also used as starting switches. More recently, solid-state switches ..."
See more references to Relays, Motor Start in this book.
Ford V8 Performance Guide: The Stocker's Bible (Bill Carroll's performance engineering handbooks)
William Carroll

Excerpt - page 99: "... Spark Plug ClAF-12405-A Wiring- Dash to Engine Gage CIAB-14289-C Cable- Start Motor Relay COAF-14431-C Retainer- Crankcase Ventilation COAE-6A633-A Disc.- Clutch COAA-7550-B Plate- Clutch ..."
See more references to Relays, Motor Start in this book.
Water Treatment Plant Design (McGraw-Hill Handbooks)
American Water Works Association and American Society of Civil Engineers

Excerpt - page 311: "... reclosed except for the branch breaker involved with the fault. Relays are used for control and protection of motors. Contactors usually are high- capacity electromagnetic actuated devices used to actually start the motor. The relay does not carry heavy motor loads, ..."
See more references to Relays, Motor Start in this book.
Technician's Guide to Refrigeration Systems
John A. Corinchock

Excerpt - page 270: "... See Chapter 9 for more details on potential and current-type start relays. Motor Strength Motors are generally classified by starting methods and/or power ..."
See more references to Relays, Motor Start in this book.
Industrial Refrigeration Handbook
Wilbert F. Stoecker

Excerpt - page 485: "... oil pump have been stopped, as in Ex. 14.5, the START button is pressed. Describe the sequence. Solution. Relay 1TR has been left energized, ... now closed, the oil pump motor relay 1M and the start delay relay 2TR are energized. ..."
See more references to Relays, Motor Start in this book.
Dishwashers (Volume 13)
Harry D. Raker

Excerpt - page 55: "... Float Switch HOUSING BELOW TUB 5300806256 Use 5300801629 FLOAT SWITCH MOTOR START RELAY 6300809173 MOTOR WITH SHAFT NCL JOEG WI I H MOTOR, ..."
See more references to Relays, Motor Start in this book.
Pamphlet Architecture 14: Mosquitoes (Pamphlet Architecture)
T. Krueger and K. Kaplan

Excerpt - page 16: "... into linear thrust. R panel supports the motion-control components including relays, motor-start capacitors, switches, and timers. Just to the rear of the ..."
See more references to Relays, Motor Start in this book.
Troubleshooting and Repairing Major Appliances
Eric Kleinert

Excerpt - page 157: "... be sure that the flywheel turns easily. 4. Does the motor stay in the start winding? Use the ammeter to ... motor? 7. Is the start relay OK? Erratic operation 1. Are there any loose connections? For ..."
See more references to Relays, Motor Start in this book.
Electrical Engineer's Portable Handbook
Robert B. Hickey and Robert Hickey

Excerpt - page 213: "... Class L Fuse S-RK 100SP Class RK1 Fuse >Motor Starting Curve Across the Line Start Motor Overload Relay Class 10 Motor Stall Point Part of a Motor Damage ..."
See more references to Relays, Motor Start in this book.
How to Prepare for the GED, Canadian Edition (Barron's How to Prepare for the Ged High School Equivalency Examination Canadian Edition)
Murray, Ph.D. Rockowitz, Samuel C. Brownstein, Max Peters, and Ira Wolf

Excerpt - page 402: "... beam, the current stops. The result is to close a relay that starts a motor. Almost a hundred years ago, Heinrich Hertz found that certain ..."
See more references to Relays, Motor Start in this book.
Basic Industrial Electricity: A Training and Maintenance Manual
Kenneth G. Oliver

Excerpt - page 187: "... F. DC MOTOR CONTROLLERS button and the electromagnetic relays start the motor and bring it up to speed automatically in the proper ..."
See more references to Relays, Motor Start in this book.
HVAC/R Terminology: A Quick Reference Guide (Second Edition)
Richard Wirtz

Excerpt - page 76: "... current of a power source constant under varying conditions. Current relay - a normally open relay that is opened or closed by the starting current of an electric motor. The relay allows the start capacitor and start windings to drop in or out of ..."
See more references to Relays, Motor Start in this book.
Handbook of Electrical Construction Tools and Materials
Gene Whitson

Excerpt - page 370: "... number of contacts and other characteristics needed. Timers and Timing Relays A pneumatic timer or timing ... the bearings of the main motor for a set period of time before the main motor starts. ..."
See more references to Relays, Motor Start in this book.
Encyclopedia of Chemical Processing and Design (Encyclopedia of Chemical Processing & Design)
John J. McKetta

Excerpt - page 274: "... purchase specifications. Data from these studies will be used for relay and fuse coordination. Load flow ... with on-site generation or synchronous motors [37]. Motor starting studies are ... other motors when large motors start. Relay and fuse coordination is one of the most important ..."
See more references to Relays, Motor Start in this book.
Design and Use of Pressure Sewer Systems
David Thrasher

Excerpt - page 84: "... 84 PRESSURE SEWER SYSTEMS pump has a capacitor start type motor, the capacitors and start relays must be located in a separate control panel enclosure . ..."
See more references to Relays, Motor Start in this book.
Encyclopedia of Chemical Processing and Design (Encyclopedia of Chemical Processing and Design)
John J. McKetta

Excerpt - page 151: "... other Is discussed previously, satisfies the AND and permits the motor to start when the start pushbutton is pressed (hence the label "permissive"). A relay connected to the motor coil "disengages" the permissive logic as ..."
See more references to Relays, Motor Start in this book.
Pumping Station Design, Second Edition
Robert L. Sanks

Excerpt - page 195: "... due to mechanical overload or to a locked-rotor condition, the relay (connected so as to de-energize ... is gradually heated. As the motor does not heat instantaneously, the ... lag allows the motor to start. Relays are available in quick trip (Class 10), standard trip ..."
See more references to Relays, Motor Start in this book.
Electronic Filters, Amplifiers & Oscillators - Frequency Devices
SOC Central
Electronic Filters, Amplifiers & Oscillators - Frequency Devices
Home | About us | Contact Us | Advertisers | Terms of use | Privacy | Link To Us

© 2006, ElectronicDesignNet.com