... protectionLow voltage protectionOpen-current protectionShort-current protectionNagative direction protection1.Features:1,Standard, exquisite profile, good at discharging heat. High ... /L,H4 (H/L),9004,9005,9006,9007,9004/H.9004/L,9004(H/L),9006(H/L),9007/H,9007/L,9007(H/L ... ST),high efficiency, long lifespan, and low defect rate(<1%).6,Stable output frequency without Hertzian waves.7,Self-developed and ...