Tecmark TBS339A SPNO air switchTecmark SPNO Air Switch TBS339A In stock$2299
Tecmark TBS339A SPNO air switch
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Tecmark SPNO Air Switch TBS339A

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$2299
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Quick overview

  • Genuine Tecmark Factory part number TBS339A.
  • SPNO configuration Single pole, normally open, so the circuit closes when the switch is actuated.
  • Air actuated A puff of air down the tubing from the button trips the switch, keeping line voltage away from the bather.
  • Single pole Switches one circuit, so match it to the equipment it controls before ordering.
  • Spa and pool equipment Used on spa packs and equipment where a pneumatic button starts a pump or blower.
  • Direct replacement Swaps for a failed TBS339A without rewiring the panel.
Full description and specifications ↓

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Product details

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.

Specifications
Brand Tecmark
Manufacturer part number TBS339A
Type Air switch
Configuration SPNO, single pole normally open
Actuation Air, pneumatic
Ships Parcel

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Customer reviews

Questions and answers

What people ask about this product, answered by our pool techs.

What does SPNO mean?
Single pole, normally open. The switch holds one circuit open at rest and closes it when air actuates it.
How does an air switch work?
A button at the pool or spa pushes air down a length of tubing. That pressure trips a diaphragm inside the switch, so no electrical wiring has to run out to the button.
Is this a genuine Tecmark part?
Yes. It is the Tecmark air switch, part number TBS339A.
My spa button no longer starts the pump. Is the switch at fault?
It can be, but check the air tubing and the button first. A cracked tube or a leaking button loses the pressure the switch needs before the switch itself is the problem.
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