Abstract: The structure and working principle of a novel micro-accelerometer switch are proposed, and the high overload resistance of the mechanism is analyzed. The design formula of the size parameters that meet the high overload conditions is obtained, and the parameterized mathematical model of the mechanism is established. The system-level modeling and simulation of the mechanism are carried out according to the mathematical model, and the displacement-time relationship curve is obtained. The simulation results show that the micro-accelerometer switch has the effectiveness and feasibility of switching under the high overload conditions. Keywords: microelectromechanical system; micro-fuze; stiffness; high overload; micro-accelerometer switch Introduction Accelerometer switch, also known as G switch, is a type of inertial device that senses acceleration and completes braking []. The barrel environment experienced by the projectile during the launch process is very harsh, ranging from recoil overload of several thousand g g acceleration to more than 10,000 g g acceleration and centrifugal overload environment [1]. Traditional mechanical accelerometer switches are large and heavy, making it difficult to meet the requirements of high overload environments. With the application and promotion of micromachining technology in the sensor field, different types of micro accelerometer switches have emerged. Micro accelerometer switches based on MEMS technology have the characteristics of miniaturization, high reliability, and low cost due to their flat structure design, and have become one of the important ways to solve the miniaturization of micro fuse safety systems. They have a wide demand and broad application prospects in weapons and ammunition [2]. This paper takes a certain silicon micro fuse as the application background and designs a high g value micro accelerometer switch mechanism based on MEMS technology to ensure that the projectile can safely release the safety device within a specified time after launch and achieve safe detonation. The theoretical formula of cantilever beam stress is derived from the perspective of advanced dynamics, the relationship of size parameters that meet high overload is obtained, and the basic mathematical model of micro accelerometer switch is established. The system-level modeling and simulation of the mechanism are carried out according to the mathematical model. The simulation results show that the mechanism can meet the requirements as a micro accelerometer switch and has the ability to resist high overload. For details, please click: High g value micro accelerometer switch design