Rail systems tend to push power supplies into operating windows that wander far outside what most industrial converters ever see. Input rails drift with loading, surge during braking recovery, and sag during cold starts. Designers often end up juggling multiple converters just to keep equipment stable across these conditions. RECOM’s new RMD300-110-110SUW targets this problem directly by giving engineers a single 300W module that holds regulation across the full spread of global railway voltages while delivering a fixed 110VDC output for downstream loads.
Wide Input Behaviour Designed for Real Rail Conditions
The device works across a 12:1 input window from 16.8V to 137.5V, which means it can ride through the typical dips and surges defined in EN 50155 without external conditioning. In practice, the ability to accept 14.4V for short drops and tolerate up to 170VDC for three seconds gives designers breathing room when supply rails behave unpredictably. The converter also maintains a minimum 10ms hold up across the full range, which helps stabilise equipment during rapid transitions or momentary brownouts.
Thermal Headroom That Matches Harsh Deployments
Keeping a 300W converter within thermal limits in rolling stock can be difficult when airflow is restricted or equipment is placed in sealed enclosures. The RMD300-110-110SUW runs to 85°C ambient without derating through a mix of convection and conduction cooling, and can be pushed to 90°C with reduced power. These limits position it comfortably inside EN 50155 Class OT4 and extended Classes ST1 and ST2. A temporary 330W boost for up to ten seconds provides headroom for loads that spike during start up or switching activity.
Certification Coverage That Reduces External Design Work
Rail qualification often means stitching together multiple documents to satisfy EMC, fire safety and insulation requirements. This module rolls those into a single package with compliance to EN 50155, EN 50121-3-2 and the IEC/EN 61000 suite for EMC, along with EN 50124-1 for insulation coordination and EN 45545-2 for fire safety. Isolation is reinforced at 3.5kVAC or 5kVDC, and the product is suitable for IP20 and Pollution Degree 2 installations up to 2000m altitude. The coated PCB, built to IPC A 610G Class 2, adds an extra layer of reliability for harsher environments.
Practical Integration Features for Redundancy and Control
In real systems, failure modes matter as much as efficiency. Protection is built in against reverse polarity, undervoltage, overtemperature, overloads, short circuits and output overvoltage. A built in ORing diode supports parallel operation for redundancy or scaling power. Engineers also get remote ON OFF control, current share capability, output trimming and Power OK signalling through both an LED and volt free relay contacts. Mechanical integration is straightforward through a 209 by 141 by 48mm open frame design with screw terminal connections.
Why This Product Matters for Railway Designers
Rail equipment often depends on stable 110V subsystems that are sensitive to input variation. A converter that can bridge every common rail voltage without relying on external filtering or extra protection simplifies system architecture and reduces certification overhead. For engineers, the benefit is a power stage that aligns with long life deployments, has a 1.36 million hour MTBF at 40°C, and fits the 20 year useful life profile set out for modern rolling stock applications.
Learn more and read the original announcement at www.recom-power.com
You may also like
