ABSOPULSE Electronics has recently released the POL 400R Series of railway quality, ac/dc switch mode power supplies. The 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 railway applications, including signaling and communications, the units are suitable for industrial, mining, military, marine and other severe environments.

These 400W power supplies operate from input sources of 115Vac (97-132Vac range) or 230Vac (195-264V range) and deliver standard outputs of 12Vdc, 24Vdc, 36Vdc, 48V or 110Vdc. Efficiency is between 80% and 90%, depending on the input/output configuration required. The POL 400R Series has comprehensive protection features including 3000Vdc 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 POL 400R units are conduction cooled and operate in a -40°C to +70°C cold plate temperature range for full specification - no fans are required. Housed in rugged, compact 131 x 66 x 232 mm enclosures, the power supplies are fully encapsulated in a thermally conductive MIL-grade silicon rubber compound, which protects them against high levels of shock and vibration (EN61373/IEC61373), moisture, dust and other contaminants.

For the POL 400R Series specifications, please see data sheet (right).

ABSOPULSE offers an extensive range of railway and industrial quality power supplies designed for operation in severe environments. These designs can readily be modified to meet customer specified electrical and mechanical requirements. We also provide fully-custom solutions with short delivery times and low set-up costs.