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  2. Relay - Wikipedia

    en.wikipedia.org/wiki/Relay

    Relay. A relay is an electrically operated switch. It consists of a set of input terminals for a single or multiple control signals, and a set of operating contact terminals. The switch may have any number of contacts in multiple contact forms, such as make contacts, break contacts, or combinations thereof.

  3. Electrical contact - Wikipedia

    en.wikipedia.org/wiki/Electrical_contact

    An electromagnetic relay with a pair of contacts. An electrical contact is an electrical circuit component found in electrical switches, relays, connectors and circuit breakers. [1] Each contact is a piece of electrically conductive material, typically metal. When a pair of contacts touch, they can pass an electrical current with a certain ...

  4. Train Protection & Warning System - Wikipedia

    en.wikipedia.org/wiki/Train_Protection_&_Warning...

    TPWS was developed by British Rail and its successor Railtrack, following a determination in 1994 that British Rail's Automatic Train Protection system was not economical, costing £600,000,000 equivalent to £976,058,932 in 2019 to implement, compared to value in lives saved: £3-£4 million (4,880,295 - 6,507,060 in 2019), per life saved ...

  5. Distribution board - Wikipedia

    en.wikipedia.org/wiki/Distribution_board

    Electrical installations. A distribution board (also known as panelboard, breaker panel, electric panel, fuse box or DB box) is a component of an electricity supply system that divides an electrical power feed into subsidiary circuits while providing a protective fuse or circuit breaker for each circuit in a common enclosure.

  6. Principal Place - Wikipedia

    en.wikipedia.org/wiki/Principal_Place

    Principal Place is a 15-storey office block in Shoreditch, London, designed by Foster and Partners and completed in 2016. [1] Since 2018, it has been occupied by the internet retailer Amazon.com as its UK headquarters. It is situated at the eastern end of Worship Street, with the main entrance approached across a pedestrian piazza from ...

  7. Solid-state relay - Wikipedia

    en.wikipedia.org/wiki/Solid-state_relay

    Solid-state relay. A solid state relay ( SSR) is an electronic switching device that switches on or off when an external voltage (AC or DC) is applied across its control terminals. They serve the same function as an electromechanical relay, but solid-state electronics contain no moving parts and have a longer operational lifetime.

  8. Relay bid - Wikipedia

    en.wikipedia.org/wiki/Relay_bid

    Relay bid. In contract bridge, a relay bid is a conventional bid that usually has little or no descriptive meaning but asks partner to describe some feature of his hand. A relay is often the cheapest bid available but need not be. Stayman and Blackwood are common examples of relay bids. The rationale for introducing relay bids emerged from the ...

  9. Recloser - Wikipedia

    en.wikipedia.org/wiki/Recloser

    Also known as reclosers or autoreclosers, ACRs are essentially rated circuit breakers with integrated current and voltage sensors and a protection relay, optimized for use as a protection asset. Commercial ACRs are governed by the IEC 62271-111/IEEE Std C37.60 and IEC 62271-200 standards. [1] [2] The three major classes of operating maximum ...

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