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Momentary SPST-NO tactile switch

Push Button (Tactile Switch) Working Principle

Learn how Push Button (Tactile Switch) works with an illustrated explanation and practical readings.

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Push Button (Tactile Switch) at a glance

Follow the labeled connections and functional stages

Push Button (Tactile Switch) working principle: illustrated functional stages, basic circuit and connections
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How it works

3 stages · Explore one step at a time

Step 1 / 3

Released: the dome holds the contacts apart

A small metal dome sits over the fixed contacts. Unpressed, it does not touch the centre contact, so terminals 1 and 2 are open (insulation ≥ 100 MΩ).

Step 2 / 3

Pressed: the dome snaps and closes the circuit

At about 0.98 ± 0.29 N (100 gf) the dome snaps through with the click you feel, and its centre lands on the inner contact: terminal 1 meets terminal 2 through at most 100 mΩ.

Step 3 / 3

The contacts bounce, then settle

Metal on metal rebounds a few times before it rests. For up to 5 ms the input may see several edges; a debounce delay or an RC filter turns them into one.

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