This practical water temperature sensor switch is specially designed for SH-3 and SH210-3 excavators. It real time perceives engine cooling liquid temperature and transmits effective control signals to the whole machine circuit system. It can effectively trigger temperature protection functions and avoid engine overheating faults during construction work. With solid overall structure and good sealing performance, it maintains stable working effect in long time field operation. Produced according to original fitting standards, it has sensitive trigger reaction, easy installation and long service life for daily mechanical maintenance