A pull switch is a convenient and safe way to turn electrical power on or off for lights and appliances, especially in damp areas. It can be a string or pull chain switch, and can be used in public safety situations. Three-way switches allow the same light to be turned on/off at both ends of corridors or walkways. Light switches come in various modes, including electronic and electric with dimmers. TRIAC circuits can be used to control high-power devices.
A pull switch is a switch that breaks or creates an electrical circuit by pulling on a cord or chain. It is a good choice in situations where extensive electrical wiring may not be suitable, such as in damp and wet areas. A pull switch also provides a very convenient and safe way to turn electrical power on or off for lights and other appliances.
Electrical switches come in several types. An electric pull switch is of the sequential type, like the pushbutton switch. Some light switches use the standby voltage across the switch to power a night light, seen as a small neon light or light emitting diode (LED). Most of these night lights activate automatically without additional wiring.
The pull switch alternately locks in the “on” position and then in the “off” position with each pull. A string switch is very common for home use, while the pull chain switch can offer robustness in special environments. In public safety situations, for example, outdoor pull chain switches can be useful for emergency floodlights and sirens.
A three-way switch connection allows the same light to be turned on/off at both ends of corridors or walkways. With a three-way connection, two two-position switch units are used which are single pole two-throw (SPDT). For these switches, unlike SPST (single pole single throw), SPDT has one common terminal and two wired positions. The SPST has two wired locations that make or break a single circuit, while the SPDT turns on one circuit and then another. By connecting two SPDTs so that each can break and create a circuit, the two SPDTs and some additional wiring become a three-way switch.
Light switches come in a variety of switching modes. Most of these switches are SPST, which is usually a rocker type that can be pushed to an on or off position. In electronic switches, there are tactile or touch-sensitive switches that detect changes in the touch pad’s capacitance due to contact with human skin. These switches are very convenient and require very little effort.
Electronic and electric light switches may also have stepless dimmers or step dimmers with semi-bright “off” and full brightness or “on” functions. Electric dimmers have been improved by using a three-terminal alternating current (AC) controller known as an alternating current triode (TRIAC). Pull switches that control high-power devices can use electromechanical or electronic relays, such as the TRIAC circuit.
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