What Is a Relay?

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• published: 06 Sep 2013
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What Is a Relay? is presented by Katie Rydzewski for Galco TV. Buy Relays at 800-337-1720 or visit: http://www.galco.com/get/Relays?source=YouTubeHowTo Sign up for Galco’s newsletter that features our newest products, our can't-miss deals, our best videos, and total access to Galco’s electronics expertise: http://www.galco.com/email/ Connect with us! https://plus.google.com/+GalcoIndustrial https://www.facebook.com/GalcoIndustrial https://twitter.com/GalcoIndustrial https://www.linkedin.com/company/galco-industrial-electronics Don't forget to like and comment on this video, and subscribe to our channel! Relays are switches that open and close circuits electromechanically or electronically. They control one electrical circuit by opening and closing contacts in another circuit. When a relay contact is normally open (NO), there is an open contact when the relay is not energized. When a relay contact is Normally Closed (NC), there is a closed contact when the relay is not energized. In either case, applying electrical current to the contacts will change their state. Relays are generally used to switch smaller currents in a control circuit and do not usually control power consuming devices except for small motors and Solenoids that draw low amps. Nonetheless, relays can "control" larger voltages and amperes by having an amplifying effect because a small voltage applied to a relay's coil can result in a large voltage being switched by the contacts. Protective relays can prevent equipment damage by detecting electrical abnormalities, including overcurrent, undercurrent, overloads and reverse currents. In addition, relays are also widely used to switch starting coils, heating elements, pilot lights and audible alarms. To find General Purpose Relays visit: http://www.galco.com/shop/General-Purpose-Relays?source=YouTubeHowTo For Solid State Relays visit: http://www.galco.com/shop/Solid-State-Relays?source=YouTubeHowTo Galco is a Factory Authorized Stocking Distributor for Over 150 Brands of Industrial Electrical & Electronic Automation, Controls and Component Products; On-Site and Send-In Repair Services for Industrial Control & Automation Products for Over 2,000 Brands; Engineered Systems Integration, Retrofits & Upgrades for Variable Speed Drives, CNC, PLC Systems, Dynamometers & Test Stand Applications. Visit us online at http:// www.galco.com or call us at 800-337-1720. http://www.galco.com/safety With respect to the usage, installation or assembly of any products described in this video, Galco Industrial Electronics, Inc., a Michigan corporation, encourages you to follow the requirements and/or guidelines of: i) the Occupational Safety and Health Act of 1970, Public Law 91-596, as amended, and all laws, rules and regulations implemented in relation thereto; ii) the National Electric Code®; and iii) NFPA 70E®. Any installation, assembly or work described in this video should be performed by a qualified licensed electrician. GTV, Galco, galco.com, Galco Industrial Electronics, and Galco Industrial Electronics, Inc. are registered and/or pending registered trademarks under the U.S. Patent and Trademark Office, assumed names, registered domain names, and/or trade names of Galco Industrial Electronics, Inc., a Michigan corporation. LEGAL DISCLAIMER: While we have made every attempt to ensure that the information provided is accurate and has been obtained from reliable sources, Galco is not responsible for any errors or omissions, or for the results obtained from the use of this information. All information is provided "as is", with no guarantee of completeness, accuracy, timeliness or of the results obtained from the use of this information, and without warranty of any kind, express or implied, including, but not limited to warrantees of performance, merchantability and fitness for a particular purpose. At all times you should defer to the instructions and safety guidelines issued by the manufacturer. In no event will Galco, its agents or employees thereof be liable to you or anyone else for any decision made or action taken in reliance on the information provided to you or for any consequential, special or similar damages, even if advised of the possibility of such damages.