This compact step-down DC-DC converter has an input voltage of 24 VDC nominal (range 20 VDC to 37 VDC) to a highly regulated output voltage of 12 VDC nominal at 20 Amps. This a non-isolated 20 amp DC-DC converter and is made for use in negative ground systems. These units have CE EN61000-6-3:2007+A1:2011 and CE EN61000-6-1:2007 20 Amp 24 volt to 12 volt dc to dc converter Features: Green LED on front panel to confirm power onTerminal block for DC input/outputOver Temperature protectionOver Load protectionDC Input Low Battery ShutdownDC Input High Battery ShutdownDC Output Short ProtectionDC Output Over Current ProtectionDC Output Over Voltage ProtectionTransformer basedAluminum case for optimal coolingInstruction manualFree 1 year tech support1 Year Warranty Parts and Labor Specifications: CE EN61000-6-3:2007+A1:2011CE EN61000-6-1:2007 DC Input Voltage: 20-37 VdcDC Output Voltage: 12.5-13.5 VdcOutput Current: 20 ampsOutput Current Max: 24 ampsNon-IsolatedConversion Effiency: >91%DC Input LowBattery Shutdown: 18 +/- 1 VDC Input High Battery Shutdown: >38VdcDC Input Over Current Protection: 15A FuseDC Input Polarity Protection: Fuse ProtectedOver Temperature Protection: 150 +/- 5 FDC Output Short Protection: YesDC Output Over Current Protection: 24 ampsDC Output Over Voltage Protection: TVS DiodeUnit Weight: 0.97 lbs.Unit Size L x W x H: 5.91 x 3.39 x 2.2 inchesShipping Weight: 1 lbs.