Definition of snap-action in English:

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snap-action

adjective

1Denoting a switch or relay that makes and breaks contact rapidly, whatever the speed of the activating mechanism.
Example sentences
  • When the gate switches between its two states, it does so abruptly, like a snap-action light switch.
  • The snap-action switching element is operated via plungers which act on the outer limbs of the spring.
  • With multiple options available for contact configurations, terminals and actuators, you can configure a Cherry miniature snap-action switch to fit nearly any size and electrical requirements.
2Denoting a gun whose hinged barrel is secured by a spring catch.
Example sentences
  • The ejector is operated by the rotation of the joint-check, and allows the shells to be pressed clean home, if preferred. These guns, I understand, will be on the market in a short time, and I believe today no stronger fastening can be made on any snap-action gun.

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