• Output Power: 300 W
• Output Voltage: 12 V DC
• Output Current: 25 A
• Input Voltage Range: 67.2 – 143 V DC (continuous) / 57.6 – 154 V DC (1 sec)
• Efficiency: 91 %
• Ripple & Noise: ≤ 120 mVp-p
• Inrush Current: max. 45 A @ 110 VDC
• No-load Power Consumption: Not specified (Semi-potted)
• Operating Temperature: −40 °C to +70 °C (derating above +55 °C)
• Cooling: Fanless natural convection
• Protection Functions: Short circuit, Overload, Over voltage, Over temperature, Input reverse polarity
• Overvoltage Category: OVC II
• Isolation Voltage: 4000 V DC between input and output
• Dimensions (L x W x H): 216 mm x 96.5 mm x 40 mm
• Weight: approx. 1190 g
• Safety & EMC Certificates: IEC 62368-1, UL 62368-1, EN 50155, EN 45545-2, EAC
• LED Indicator: Power On indicator (Green)
• Manufacturer Warranty: 3 years

Information about the MEAN WELL RSD-300D-12

The MEAN WELL RSD-300D-12 is a professional-grade 300W DC-DC converter engineered specifically to comply with railway standards EN 50155 and EN 45545-2. Its semi-encapsulated design provides a critical layer of protection against environmental hazards such as humidity, dust, and mechanical vibration, ensuring long-term reliability in rolling stock and harsh industrial sectors. The low-profile 1U design, standing at only 40mm, facilitates easy mounting in modern, space-constrained enclosures without compromising thermal performance or power density.

This unit stands out with its wide 2:1 input voltage range and high-tier transient ability, allowing it to maintain a stable 12V output despite significant DC line fluctuations. Superior durability is achieved through the use of 105°C long-life electrolytic capacitors and a high 4000VDC I/O isolation, which safeguards sensitive connected electronics. With a high 91% efficiency rating and fanless free air convection cooling, the RSD-300D-12 minimizes energy loss and thermal stress, while the built-in constant current limiting circuit provides robust protection against overloads and short circuits.