(Single Pole, Single Throw). One pole per direction. Can be normally closed or normally open.
DPST relay
Department under development
Relay SPDT
(Single Pole, Double Throw). One pole, two directions. Those. There is one common contact that can switch with two directions.
Latching Relays
Section under development.
Relay DPDT
(Double Pole, Double Throw). Two poles for two directions, i.e. 2 groups of switches. In fact, these are two SPDT (2SPDT) relays in one, but having a common coil.
Capacitors
Trimmer and fixed condensers with optional air and water cooling
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