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products of medium voltage department include cucr10~cucr50, cuw and cuw-wc contact materials, having excellent properties of vacuum interrupting and voltage endurance. these contact materials, which dominate the vacuum interrupters market, are widely used for circuit breaker of 126kv and lower. sirui has two product lines of vacuum casting and infiltration, supported with more than 100 facilities. sirui is the biggest manufacturer for contact materials in the world, with annual production capacity of 6 million pieces.