The CHB300-300S12 from Cincon Electronics is a DC to DC Converter with Input Voltage 180 to 425 V, Output Voltage 1 12 V, Output Current 1 25000 mA, Output Power 300000 mW, Isolation Voltage 500 to 3000 V. Tags: Through Hole, Buck/Step down. More details for CHB300-300S12 can be seen below.