The design,modeling,and simulation of a micro electrical switch for fuze are presented.It consists of springemass system with zigzag slot in mass,latching and electrical connection mechanism and movement-limit mechanism.The switch keeps off-state until it is subjected to an acceleration when fuze is launched normally.The acceleration is simulated as half-sine pulse with specific amplitude and duration.The dynamics model of the switch is studied.Based on zigzag slot in mass,the methods used for recognizing acceleration load are established and analyzed according to the dynamics theory.Two typical half-sine accelerations are loaded on the switch in simulation.The simulation results are in accordance with those of theoretical analysis.The inertial response characteristics of the switch can ensure that the fuze power supply and circuit are connected safely and reliably. The design, modeling, and simulation of a micro electrical switch for fuze are presented. It consists of a springemass system with zigzag slot in mass, latching and electrical connection mechanism and movement-limit mechanism.The switch keeps off-state until it is subjected to an acceleration when fuze is launched normally. The acceleration is simulated as half-sine pulse with specific amplitude and duration.The dynamics model of the switch is studied. Based on zigzag slot in mass, the methods used for recognizing acceleration load are established and analyzed according to the dynamics theory. Two typical half-sine accelerations are loaded on the switch in simulation. the simulation results are in accordance with those of theoretical analysis. inertial response characteristics of the switch that ensure that the fuze power supply and circuit are connected safely and reliably.