Switch SPDT - Center Off - Rocker - Spring Action
SPDT Switch - Center Off - Rocker - Spring Action
A Single Pole Double Throw toggle switch connects a common terminal to one or the other of two terminals. It is always connected to one or the other. The two outside terminals are never connected by the switch.
To use a SPDT switch as a SPST switch just use the common terminal and either of the other terminals. So..you could use C and A or you could use C and B.