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A Single-Pole, Single-Throw (SPST) mercury switch on millimetre graph paper, device length approximately 1.5 cm Another mercury switch design. A mercury switch is an electrical switch that opens and closes a circuit when a small amount of the liquid metal mercury connects metal electrodes to close the circuit. There are several different basic ...
These switches appear externally similar to single pole, single throw (SPST) switches, but have extra connections which allow a circuit to be controlled from multiple locations. Toggling the switch disconnects one "traveler" terminal and connects the other. Electrically, a typical "3-way" switch is a single pole, double throw (SPDT) switch. By ...
In the United Kingdom and in Ireland, this system is usually referred to simply as a "13 amp plug" or a "13 amp socket". BS 546 , Two-pole and earthing-pin plugs, socket-outlets and socket-outlet adaptors for AC (50–60 Hz) circuits up to 250 V is an older British Standard for three-pin AC power plugs and sockets .
Below is a list of typical switch configurations and usage: Single pole, double throw (SPDT or 1:2) switches route signals from one input to two output paths. Single pole double throw (SPDT) switch from Agilent Technologies. Multiport switches or single pole, multiple throw (SPnT) switches allow a single input to multiple (three or more) output ...
In the single-phase standard AS/NZS 3112 used in residential environments, plugs of lower current rating may be inserted into single phase socket outlets of higher current rating but not vice versa. While this feature is somewhat reflected with multiphase sockets, it is further limited to only plugs within the same group.
1917 motor switch, with extra contacts Dual-pole, dual-throw knife switch in one of its two closed positions. A knife switch is a type of switch used to control the flow of electricity in a circuit. It is composed of a hinge which allows a metal lever, or knife, to be lifted from or inserted into a slot or jaw.
In electrical distribution, a fuse cutout or cut-out fuse (often referred to as a cutout) is a combination of a fuse and a switch, used in primary overhead feeder lines and taps to protect distribution transformers from current surges and overloads. An overcurrent caused by a fault in the transformer or customer circuit will cause the fuse to ...
A switch disconnector combines the properties of a disconnector and a load switch, [1] so it provides the safety isolation function while being able to make and break nominal currents. Integrated disconnecting switch
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