Converters and Power Supplies for the Communications, Automotive & Marine Industries


These railway approved products are the perfect solution if your system specification requires galvanic isolation, high performance products for the railway industry and other demanding applications This Alfatronix range of DC-DC
converters have been designed and approved for railway applications. They meet all the necessary standards for RF immunity, transient and electrostatic discharge including EN50121 and EN61004 as well as shock and vibration to EN61373.

They are isolated and can be used to power any 12Vdc equipment from the rolling stock 24Vdc source. The circuit provides transient and EMC protection and can also
be used to protect ancillary equipment from interference and voltage surges. They can be used in conjunction with the Alfatronix PVPro range of USB chargers providing approval to EN 50155 (EN 50121-3-2) as well as other suitable equipment installations.

Two products are available, providing 6Amps or 12Amps continuous power. Both units are housed in a strong
aluminium casing and the installation is quick and easy and offers long term reliability with vibration proof connections and mounting system.


These units are IP53, so there are no ventilation holes to permit stray objects, dust or water droplets to enter the case, there are no external fuses to be tampered with. Fuses will only blow if there is a fault so there is no need to
make them accessible.


PV12i R July 2016



All products fit onto a “Click ‘n’ Fit” mounting clip which is fixed in three points allowing it to be mounted on uneven surfaces. It is easy to fit the clip into awkward places and then simply click the unit into position.

A green LED indicates when there is output from the converter. This gives reassurance to the installation engineer and speeds fault finding.



Part Number Cont/Int Power Nominal Voltage Dimensions Weight
PV6i-R 6A/10A isolated 24Vdc input, 12Vdc output 127x87x50mm 505g
PV12i-R 12A/18A isolated 24Vdc input, 12Vdc output 126x87x50mm 590g



Input voltage range 17-32Vdc
Output voltage 13.6Vdc +15% -20% at extremes of temperature, load, input tolerance, etc.
Output power
As stated, taken for a maximum of 2 minutes followed by 8 minutes rest.
Transient voltage protection EN50121-3-2 to EN61004-4
Electrostatic discharge EN50121-3-2 to EN61004-2
RF Immunity Conducted: EN50121-3-2 to EN6100 4-6, Radiated to EN6100 4-3
RF Emissions  EN50121-3-2 to EN55011
Surges EN50121-3-2 to EN6100 4-5
Vibration, Schock, Impact EN61373
Output Noise <50mV pk-pk at continuous load. Meets CISPR25
Off load current (quiescent current) <30mA
Power conversion efficiency Typically: 85%
Isolation >400Vrms between input, output and case
Operating temperature -25ºC to +30ºC to meet this specification table
+30ºC to +80ºC de rate linearly to 0A
Storage temperature -25ºC to +70ºC
Operating humidity 95% max., non-condensing
Casework Anodised aluminium, glass filled polycarbonate, dust water and impact resistance to IP533
Connections Five 6.3mm push-on flat blade connectors
Output indicator Green LED adjacent to output terminals
Mounting method ‘Click ‘n’ fit mounting clip, fitted separately using three hole fixture
Safe area protection: Over current Limited by current sensing circuit
Over heat Limited by temperature sensing circuit
Reverse polarity Limited sensing circuit
Transients Protected by filters and rugged component selection
Catastrophic protection Protected by internal input and output fuses
Approvals 2014/30/EC The general EMC directive
93/68/EEC The CE marking directive
Railway Standards to EN50155
Designed to  EN50155, EN50121-3-2, EN45545-2 and EN61373
Markings CE and E (automotive) marked