ABSOPULSE Electronics introduces the POL 400R series railway quality, AC/DC switch mode power supplies. These 400W units operate from input sources of 115V AC (97V-132V range) or 230V AC (195V-264V) and deliver outputs of 12V DC, 24V DC, 36V DC, 48V DC or 110V DC. Efficiency is between 80% and 90%, depending on the input / output configuration required.

The POL 400R series has comprehensive protection features including 3000V DC input / output isolation, overload protection and current limiting. An optional output redundancy diode allows for parallel connection to achieve higher output power or N+1 redundancy. Other options include an output fail alarm and an LED adapter can be installed on the terminal block to indicate an output "ON" condition.

The power supplies are conduction cooled and operate in a -40°C to +70°C cold plate temperature range for full specification, with no fans are required. Housed in rugged, compact 131mm x 66mm x 232mm enclosures, the power supplies are fully encapsulated in a thermally conductive MIL-grade silicon rubber compound, which protects against high levels of shock and vibration (EN61373/IEC61373), moisture, dust and other contaminants.

The POL 400R units meet relevant sections of EN50155 for electronic equipment used on railway rolling stock. They also comply with EN50121-3-2 and EN55022 Class B conducted and radiated EMI and applicable EN61000 standards, ensuring immunity to electromagnetic noise in the environment and minimum interference with other electronic equipment. In addition to a range of track-side railway applications, the units are suitable for operation in industrial, mining, military, marine and other severe environments.