Wide input railway-certified DC/DC range extended.

Jan 21, 2026

RECOM has extended its 300W railway DC/DC range with the cost-effective RMD300-110-110SUW model, featuring a fully regulated 110VDC output. Input range is ultra-wide 12:1 or 16.8V to 137.5V, to cover all common nominal rail voltages worldwide, with dips and surges according to standard EN 50155. Operation is allowed to 14.4V for 100ms and to 170VDC for three seconds and hold-up of 10ms minimum is also included across the whole input range, to allow for supply dropouts with no loss of function.

The RMD300-110-110SUW operates to 85°C ambient without derating using convection/conduction cooling and to 90°C with derating, allowing the product to be rated for Class OT4 and extended Classes ST1 and ST2 according to EN 50155. Additionally, the DC/DC can provide a boost of 330W for 10s.

Certifications include EN 50155, EN 50121-3-2, and IEC/EN 61000-4-2,3,4,5 for EMC, EN 50124-1 for insulation coordination, and EN 45545-2 for railway fire safety. Isolation is 3.5kVAC/5kVDC reinforced. The products are equipment Class I rated and are designed for IP20/pollution degree 2 (PD2) and overvoltage category III (OVC III) environments up to 2000m altitude (Class II to 5000m). Additionally, the internal PCB is protected by coating according to IPC -A-610G Class 2 standard.

The product complies with environmental standards including EN 60068 for temperature testing and EN 61373 for life, shock and vibration testing in Class B body-mount applications. Reliability is 1.36M hrs MTBF calculated at 40°C according to IEC 61709/UTE C80-810 and design lifetime is 20 years, rated ‘Useful Life Class’ L4, according to EN 50155.

Full protection is included against input reverse polarity and undervoltage, overtemperature and output overcurrent, short circuits and overvoltage. For increased power or redundancy, an output OR-ing diode function is included for paralleling outputs. Control and monitoring features include remote ON/OFF, current share pin, output trim, and a Power OK signal indicated by an LED and volt-free relay contacts.

The product is offered in a compact 209 x 141 x 48mm open-frame package with protective cover. Connections are by screw terminal.

“Our RMD300 range now includes 110VDC output which is ideal for powering downstream railway equipment that has a limited input range” comments Marco Kuhn, product manager DC/DC Plug & Play of RECOM. “The DC/DC is fully compliant with rail specifications without need for external components”.

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