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Momentary SPST-NO tactile switch

Push Button (Tactile Switch) Internal Circuitry

Explore the internal circuitry and functional stages of Push Button (Tactile Switch).

Package view

Inside Push Button (Tactile Switch)

Leads, fixed contacts, snap dome and plunger.

Cutaway of a tactile switch: two leads joined as terminal 1 to the outer contacts, terminal 2 to the centre contact, a metal snap dome above them and the plunger on top; released and pressed views.
Functional cutaway; proportions simplified.

Explore the circuit

Select a stage to see its role and connections

Two terminals, four leads

Each terminal has two leads joined by a strip in the base; the four legs only hold the switch firmly.

The snap dome

Pressing flattens the dome past its tipping point: the click, and the contact.

Return

Released, the dome springs back and lifts the plunger: the contact opens again.

Component view