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Glossary

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Term Description
SPDT Single-Pole Double-Throw - A three-terminal switch or relay in which one central terminal connects to either one of the other two terminals. This type of switch can alternately connect a signal to one of two devices.
SPST Single-Pole Single-Throw - A two-terminal switch or relay that can open or close one circuit.
SSR Solid State Relay - A solid state circuit that employs devices such as opto-couplers, transistors, and triacs to perform the function of a mechanical relay. See: Relay.
Supply Current The total current that a circuit requires from a power supply.
Suppression Diode A reverse-biased diode placed across a relay or solenoid coil. When the coil loses power, the diode provides a short circuit that quickly dissipates energy stored in the coil.
Surge Current A high charging current that flows into a power supply filter capacitor or similar circuit as the power is first turned on. Similar to inrush current.
Surge Suppressor A circuit that limits the effects of power surges. Devices such as metal-oxide varistors (MOVs), zener diodes, and fuses provide this function.
Switch An electronic or mechanical device that can connect one signal to a series of connections. Switches ideally have zero impedance when closed and infinite impedance when open.
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