Hollow composite insulators for 35-1100kV This series of products is applicable to the circuit breaker, load switch, disconnector, earthing switch, instrument transformer, power transformer and bushings. Hollow composite insulator is shaped by whole injection of silicon rubber. After the electrical performance optimization and structural designing optimization, the product has excellent insulating performance and reliability. The maintenance is convenient and it has the advantage of explosion-proof, seismic resistance and pollution resistance. The products comply with GB/T21429-2008 standard.