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Safety Limit Switch Topic: Snap Action

FAQ No. FAQ02351

Question

What is snap action?

 

Answer

SPST-NC + SPST-NO Contact (Snap Action) Example

The SPST-NC + SPST-NO contact snap action switches have the direct opening mechanism (forcibly opened contacts) defined under EN 60497-5-1. The NC contact side is the only side with a direct opening mechanism (forcibly opened contacts).

1. When contact welding occurs.

2. When contacts are being pulled apart.

Safety cam directly pushes up the movable contact blade.

3. When contacts are completely pulled apart.

Other Safety Limit Switch FAQs

 What is the difference between Safety Limit Switches and General-purpose Limit Switches?

 What is direct opening travel (DOT)?

 What is total travel (TT)?