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SPST-NO. Form A [4] Single pole, single throw, normally open A simple on-off switch. The two terminals are normally disconnected (open) and are closed when the switch is activated. An example is a pushbutton switch. SPST-NC Form B [4] Single pole, single throw, normally closed A simple on-off switch.
When more than one common terminal is used, the number of poles increases. Figure 1C shows a double-pole, single-throw (DPST) switch. Both poles are actuated simultaneously when the relay is energized. In this case, both poles are either always closed or always open. Figure 1D illustrates a double-pole, double throw (DPDT) switch.
In contrast to a simple light switch, which is a single pole, single throw (SPST) switch, multiway switching uses switches with one or more additional contacts and two or more wires are run between the switches. When the load is controlled from only two points, single pole, double throw (SPDT) switches are used.
SPST-NC (Single-Pole Single-Throw, Normally-Closed) relays have a single Form B or break contact. As with an SPST-NO relay, such a relay has four terminals in total. SPDT (Single-Pole Double-Throw) relays have a single set of Form C, break before make or transfer contacts. That is, a common terminal connects to either of two others, never ...
There are many different kinds of DIP switches. Some of the most common are the slide, rocker, piano (side), and rotary types. Slide / rocker / piano DIP switches are commonly available in 1 to 12 contacts (positions) SPST, [4] [5] though some are available as special order up to 30 contacts (positions).
Electrical description: SPST, SPDT, DPST, DPDT, NPNT (general) Technology: slide switches, toggle switches, rocker switches, rotary switches, pushbutton switches; Keypad – Array of pushbutton switches; DIP switch – Small array of switches for internal configuration settings; Footswitch – Foot-operated switch
Form X or double-make contacts are equivalent to two Form A contacts in series, mechanically linked and operated by a single actuator, and can also be described as SPST-NO contacts. These are commonly found in contactors and in toggle switches designed to handle high power inductive loads.
SPST may refer to: Saint Paul School of Theology, a school of higher learning in Kansas City, Missouri, United States; Cad. FAP Guillermo del Castillo Paredes Airport's ICAO code; Single pole, single throw, a type of electrical switch