The 9-18AB12A500 from Acopian Technical Company is a DC to DC Converter with Input Voltage 9 to 18 V, Output Voltage 1 12 V, Output Current 1 2 to 5 A, Isolation Voltage 0.5 kV, Operating Temperature -20 to 71 Degree C. Tags: Chassis Mount, Buck-Boost. More details for 9-18AB12A500 can be seen below.