Electronic circuits and components
Fundamentals
Passive Components
Semiconductors Passive Circuits
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Switch Types<^< Switches | Course Index | Assessment: Passive Components >^> Single-pole, Single-throw The single-pole, single-throw (SPST) switch functions as a basic single-circuit 'on'/'off' switch. Single-pole, Double-throw The single-pole, double-throw (SPDT) switch functions as a single-circuit two-way switch. This type of switch is sometimes referred to as a single-pole changeover switch. Double-pole, Single-throw The double-pole, single-throw switch functions as a two-circuit 'on'/'off' switch. Double-pole, Double-throw The double-pole, double-throw switch functions as a two-circuit two-way switch. This type of switch is sometimes referred to as a double-pole changeover switch. Multi-pole, Multi-way Complex circuits may require switches that can switch more than two ways or have more than two poles. These switches are called multi-pole, multi-way switches. Commonly available types include:
Push-button Switches Push-button switches (which may be either momentary or latching types) are available in normally open (NO) or normally closed (NC) types. The contacts of a normally open switch become closed when the switch is operated while those of a normally closed switch become opened when the switch is operated. <^< Switches | Course index | Assessment: Passive Components >^> |