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Diagram of a refrigerator door from 1912. Swing doors are most commonly used on tractor-trailers (dry vans and refrigerated "reefer" vans), intermodal cargo shipping containers, certain rail cars that carry automobiles, and smaller utility trailers that haul cargo or livestock. Refrigerator door and means for operating
Defrosting is controlled by an electric or electronic timer. For every 6, 8, 10, 12 or 24 hours of compressor operation, it turns on a defrost heater for 15 minutes to half an hour. The defrost heater, having a typical power rating of 350 W to 600W, is often mounted just below the evaporator in top and bottom-freezer models. [ 2 ]
An example of a push-to-break switch is a button used to release a door held closed by an electromagnet. The interior lamp of a household refrigerator is controlled by a switch that is held open when the door is closed.
The traditional relay is an electromechanical switch that uses an electromagnet controlled by a current to operate a mechanical switching mechanism. Other operating principles are also used (for instance, solid-state relays invented in 1971 control power circuits with no moving parts, instead using a semiconductor device to perform switching ...
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.
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related to: current controlled switch for refrigerator door bottom view