Special for Railway Train, Appointed by Chinese Ministry of RailwaysPotted and Sealed StructureMoisture Proof and Anti-VibrationParticular Pre-heat Starting Circuit to Prolong Lamp LifeSwitching Times: >30000 timesPatented TopologyReliable Protection of EmergencyEMC (Electro-Magnetic Compatibility)Low THD, High Power Factor Item CDZ-EMU110