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  2. Schweitzer Engineering Laboratories - Wikipedia

    en.wikipedia.org/wiki/Schweitzer_Engineering...

    SEL was founded in Pullman, Washington in 1982 when Dr. Edmund O. Schweitzer III invented and marketed the first all-digital protective relay. Schweitzer created the relay as a Ph.D. project while at Washington State University. He sold his first product, the SEL-21, to Otter Tail Power Company in Fergus Falls, Minnesota in 1984. Otter Tail ...

  3. Struthers-Dunn - Wikipedia

    en.wikipedia.org/wiki/Struthers-Dunn

    1938 - Introduces the first relay approved for US Military Applications - the 101 Series, used on Naval Vessels. 1945 - Charles Packard, Chief Engineer and Struthers-Dunn publishes the 1st Edition of - "Relay engineering: a reference book to guide engineers and others in the selection and use of electromagnetic relays". [4]

  4. Reference designator - Wikipedia

    en.wikipedia.org/wiki/Reference_designator

    IEEE 200-1975 or "Standard Reference Designations for Electrical and Electronics Parts and Equipments" is a standard that was used to define referencing naming systems for collections of electronic equipment. IEEE 200 was ratified in 1975. The IEEE renewed the standard in the 1990s, but withdrew it from active support shortly thereafter.

  5. AOL Mail

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    Get AOL Mail for FREE! Manage your email like never before with travel, photo & document views. Personalize your inbox with themes & tabs. You've Got Mail!

  6. ZILOG Announces New "ZAURA™" RF AC Power-Switching Relay ...

    www.aol.com/news/2013-02-14-zilog-announces-new...

    This AC Power Switching Relay with ZAURA Control reference design features a90-240V AC RMS input voltage range, up to 10 amps of load current, less than 2mA of standby current at 120V AC when in ...

  7. Protective relay - Wikipedia

    en.wikipedia.org/wiki/Protective_relay

    Electromechanical protective relays operate by either magnetic attraction, or magnetic induction. [9]: 14 Unlike switching type electromechanical relays with fixed and usually ill-defined operating voltage thresholds and operating times, protective relays have well-established, selectable, and adjustable time and current (or other operating parameter) operating characteristics.

  8. The Best (and Worst) Places to Live on Minimum Wage in America

    www.aol.com/finance/best-worst-places-live...

    It takes 4.38 minimum wage workers to comfortably pay for a one-bedroom apartment, since it costs 131% of one worker’s salary to pay rent. Kruck20/istockphoto. 2. Nashville, Tennessee.

  9. Safety relay - Wikipedia

    en.wikipedia.org/wiki/Safety_relay

    As such, safety relays monitor a specific function. When connected to other safety relays, they guarantee full monitoring of a plant or machine. [1] They meet the requirements of EN 60947-5-1, EN 60204-1 and VDE 0113-1. [5] Furthermore, there are many variants of safety relays, which are suitable for various machinery applications.

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