According to the different installation methods, 1500V system over voltage absorption resistor can be divided into in-cabinet installation under-vehicle installation. The main function of the resistor is to absorb the energy of the overgrid voltage and to provide a more complete solution for different working conditions. The resistor uses a built-in two-part insulation structure that isolates the heating element from the resistor case to guarantee the insulation of the resistor. It is characterised by its strong thermal shock resistance, compactness, strong shock resistance and strong surge resistance. This product has been serving on Chongqing Rail Transit line 1,9 and 10.