Quick tripping device and circuit breaker

A tripping device, comprising an operating mechanism, a moving contact mechanism and a static contact, the moving contact mechanism comprises a contact support and a moving contact;

• the operating mechanism is in driving connection with the moving contact mechanism, so that the moving contact and the static contact are switched on or off;
• wherein the tripping device further comprising a first push rod pivotally disposed on the contact support, the first push rod comprises a first push rod driven end and a first push rod driving end, the first push rod driven end is in driving fit with the moving contact, and the first push rod driving end is in driving fit with the operating mechanism to trip the operating mechanism;
• a driving gap is formed between the first push rod driven end and the moving contact;
• when the moving contact is electrically repelled by a short-circuit current, the moving contact rotates relative to the contact support, and the moving contact rotates through the driving gap, then contacts with the first push rod driven end and drives the first push rod to rotate, so that the operating mechanism is tripped;
• and when closing the moving contact and the static contact, the moving contact does not contact the first push rod driven end when it rebounds, due to the driving gap.