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The first modern electrical refrigerator to see widespread use was the General Electric "Monitor-Top" refrigerator, introduced in 1927, and refrigerators became common in the United States in the 1930s. Regardless of the cooling technology, doors on the units were sealed shut using a mechanical latch. [3]
A push switch (button) is a momentary or non-latching switch which causes a temporary change in the state of an electrical circuit only while the switch is physically actuated. An automatic mechanism (i.e. a spring ) returns the switch to its default position immediately afterwards, restoring the initial circuit condition.
A latching switch is a switch that maintains its state after being activated. [1] A push-to-make, push-to-break switch would therefore be a latching switch – each time you actuate it, whichever state the switch is left in will persist until the switch is actuated again.
Q = 1 (1, 0) – referred to as an S (dominated)-latch; Q = 0 (0, 1) – referred to as an R (dominated)-latch; This is done in nearly every programmable logic controller. Hold state (0, 0) – referred to as an E-latch; Alternatively, the restricted combination can be made to toggle the output. The result is the JK latch.
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A residual-current device (RCD), residual-current circuit breaker (RCCB) or ground fault circuit interrupter (GFCI) [a] is an electrical safety device, more specifically a form of Earth-leakage circuit breaker, that interrupts an electrical circuit when the current passing through line and neutral conductors of a circuit is not equal (the term residual relating to the imbalance), therefore ...