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  2. Solid-state relay - Wikipedia

    en.wikipedia.org/wiki/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.

  3. Relay logic - Wikipedia

    en.wikipedia.org/wiki/Relay_logic

    In many cases, it is possible to design a relay logic diagram directly from the narrative description of a control event sequence. In general, the following suggestions apply to designing a relay logic diagram: 1. Define the process to be controlled. 2. Draw a sketch of the operation process. Make sure all the components of the system are ...

  4. Relay - Wikipedia

    en.wikipedia.org/wiki/Relay

    A relay Electromechanical relay principle Electromechanical relay schematic showing a control coil, four pairs of normally open and one pair of normally closed contacts An automotive-style miniature relay with the dust cover taken off. A relay is an electrically operated switch. It consists of a set of input terminals for a single or multiple ...

  5. Safety relay - Wikipedia

    en.wikipedia.org/wiki/Safety_relay

    The redundant design ensures that wiring errors do not lead to the loss of the safety function. Two relays (K1, K2) with positive-guided contacts provide the safe switching contacts. The two input circuits CH1 and CH2 each activate one of the two internal relays. The circuit is activated via the start relay K3.

  6. Stepping switch - Wikipedia

    en.wikipedia.org/wiki/Stepping_switch

    In electrical engineering, a stepping switch or stepping relay, also known as a uniselector, is an electromechanical device that switches an input signal path to one of several possible output paths, directed by a train of electrical pulses. The major use of stepping switches was in early automatic telephone exchanges to route telephone calls ...

  7. Protective relay - Wikipedia

    en.wikipedia.org/wiki/Protective_relay

    The relays can also be classified on the type of power source that they use to work. A dual powered protection relay powered by the current obtained from the line by a CT. The striker is also shown. Self-powered relays operate on energy derived from the protected circuit, through the current transformers used to measure line current, for example.

  8. States with the Highest and Lowest Property Tax Rates - AOL

    www.aol.com/finance/states-highest-lowest...

    2. New Jersey. The Garden State is known for being the most densely populated state in the country, but it’s also one of the most expensive for homeowners. The average property tax rate is 1.64%.

  9. Recloser - Wikipedia

    en.wikipedia.org/wiki/Recloser

    Modern automatic circuit reclosers are significantly more advanced than the original hydraulic units. The advent of semiconductor based electronic protective relays in the 1980s resulted in increased recloser sophistication, allowing for differing responses to the various cases of abnormal operation or fault on an electric power distribution ...