15c19fcd__and_Schematic_Diagram_Symbols__Electronic_Component
[Circuit Symbol] On Off Switch (SPST) Circuit Symbol [Description] Also known as the ON/OFF switch. This switch allows the flow of current only when it is kept ON. Abbreviated as SPST. [Electronic Component] 
Singe Pole Single Throw Switch
Electronic Circuit Symbols - Components and Schematic Diagram Symbols
Electronic Component