Blue Sea Systems waterproof switch Contura SPDT On-Off-On black

Blue Sea Systems' high quality waterproof switches fit into existing Contura electrical panels or can be fitted into the associated loose mounting panels.

Switch function (ON) = return spring

Pole types:
SPST = single pole and single "throw"
SPDT = single pole and double "throw"
DPST = double pole and single "throw"
DPDT = double pole and double "throw"

Pole refers to the number of circuits controlled by the switch: SP switches control only one electrical circuit. DP switches control two independent circuits (and act as two identical switches that are mechanically connected).

"Throw" refers to the outer position of the actuator: ST switches close a circuit in only one position. The second position of the lever is off. DT switches close a circuit in the Up position, as well as the Down position (On-On). A DT switch can also have a middle position (often On-Off-On).