... voltage protectionOpen-current protectionShort-current protectionNagative direction protection1.Features:1,Standard, exquisite profile, good at discharging heat. ... high efficiency, long lifespan, and low defect rate(<1%).6,Stable output frequency without Hertzian waves.7,Self-developed ... Negative direction protection:input voltage negative direction protection2.Specifications:1,Size:86*73.5*30(mm) / N. ...