Transformer oil-immersed load switch is suitable for AC frequency of 50Hz, rated voltage 35kV and below the combined transformer, installed on the wall of the combined transformer, the product is transformer oil as insulation and arc extinguishing medium, spring energy storage, three-phase linkage, in the terminal power supply or ring network power supply system, as an industrial and civil power control and protection device. Operated by lever or electric, the load current can be turned off or turned off accurately and quickly.