Overload problem in pressure-switch and effects of overload on life-span and reliability of pressure-switch are introduced

and the new method of this problem resolved by displacement restriction is put forward

Through pin-lift that drives contract-finger of micro-active switch is designed as a structure made up of two parts

unreliability of displacement restriction is solved

and experimentation results of two overload methods are compared.Experimentation results indicate that the design of the structure is reasonable

and displacement restriction is accurate

This design is of directive significance to similar products.