Tecmark SPNO Air Switch TBS339A

The Tecmark TBS339A is a single pole, normally open air switch. It is the genuine Tecmark part.

How an air switch is used

Air switches let a bather start a pump or a blower without any electrical connection at the button. Pressing the button sends a pulse of air down a small tube to the switch, which sits back at the equipment. The diaphragm inside moves and closes the circuit. Because only air travels to the button, there is no line voltage anywhere the user can reach.

Before you order

Match the configuration to what the equipment needs. This one is SPNO, single pole and normally open, so it closes a single circuit when actuated. If your panel uses a different pole or contact arrangement, a different Tecmark switch is required.