Double pole single throw, or DPST, refers to a switch that makes two connections simultaneously: two pairs of contacts are closed at the same time when the switch is pressed. One advantage of this design is reliability: should damage or oxidisation interfere with one pair of contacts, the other pair may remain functional, extending the life of the switch.
DPST microswitches typically take the form of a symmetrical slider with identical contacts on either side. The same slider may be used for both the SPST and DPST versions.
Numerous switch families were designed with DPST support, including many Cherry switch series.
DPST should not be confused with double action switches, which contain two sets of contacts, but make the connections at different points in the force curve.