A double-pole switch has two connectors (poles) that can control two circuits. A double-pole, single-throw switch (DPST) turns two circuits on or off. A double-pole, double-throw switch (DPDT) manages two circuits and turns both on and off together.Know More
Most manufacturers use the abbreviations DPST and DPDT to indicate switch types. The term pole (P) refers to the number of connections on a switch, while throw (T) refers to the number of possible positions (on or off) for a given circuit, with single (S) or double (D) referring to quantity.
The simplest switch is a single-pole, single-throw (SPST) with one input and one output controlling a single circuit. Most household light switches use SPST. The DPST switch has three connections, one input and two outputs. When there are two circuits, A and B, the DPST switch allows either circuit A or B to be on but not both circuits. The DPDT has six connectors, two inputs and four outputs that allow switching circuits A and B on or off together. These three versions comprise most of the switches used in circuits, particularly for power management. For multiple connections on a circuit, engineers may use a rotary switch, with one input and many outputs.Learn more about Electrical
A toggle switch works by using a lever to open or close an electrical circuit. Toggle switches are available in two types: maintained contact and momentary contact. Maintained switches stay in the position in which they are switched to, and a momentary switch does not.Full Answer >
Inside of a latching relay is a pivoting magnetic strip or switch that is positioned between two coils. The electricity flowing into the coils generates a magnetic field. The switch reacts to the magnetic field, falling to one side or the other, resulting in either activating or deactivating the relay.Full Answer >
A transformer is a device that transfers electricity between two circuits by magnetic induction, according to the Nuffield Foundation. Transformers also increase or decrease the effective voltage as step-up or step-down transformers. A common use of an electric transformer is to convert the high-voltage electricity in overhead power lines into a lower-voltage connection suitable for home appliances.Full Answer >
A common problem with a dimmer switch that does not dim the lights is that the user has switched from incandescent lights to compact fluorescent or other types of energy saving lamps. Older dimmer styles are not compatible with the newer lamps and often do not work at all. If dimming the lights is important, EnergyStar recommends switching to a compact fluorescent dimmer switch and dimmable CFLs.Full Answer >