The contact tip is pressed against the glass tube by the force of the return spring when ❶ .
→ Vibration- and shock-resistant structure even in a non-excitation state.

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Wiping Contact Mechanism
The contact parts make contact through motion ❷ to ❹ with a wiping motion.
→Cleans the contact surface.

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Hammering Mechanism
When the pulling force of the contacts is lost, the moving contact is flicked off by the energy of the spring on the fixed contact side when ❸ to ❷.
→Breaks contact’s minor welding and melting bridge.