Power adapter/inverter Mean Well RSD-300E-48 — 300 W, input 25.2–46.8 V, output 48 V, dimensions 97×216×40 mm

Mean Well RSD-300E-48 is a 300 W DC-DC enclosed converter that provides a regulated 48 V output from a wide DC input range. The unit accepts nominal inputs within the specified range for vehicle and stationary installations and delivers a stable +48 V output at up to 5.7 A. Housed in a compact metal enclosure with dimensions 97×216×40 mm, this converter is designed for industrial and telecom applications where reliable 48 V power is required. The design includes high isolation between input and output and meets relevant safety and environmental directives.

Advantages

The converter supports a wide DC input window which simplifies integration with various battery and DC-supply systems. Its compact metal housing offers mechanical robustness and effective thermal conduction for continuous 300 W operation. The device complies with RoHS and railway standard EN50155, and features high input-output isolation to enhance system protection and reduce interference risks.

Suitable for

• Powering 48 V telecom equipment and network devices
• Charging and maintaining 48 V battery systems in vehicles and stationary setups
• DC-DC conversion in rolling stock and railway applications compliant with EN50155
• Industrial control systems and automation panels requiring regulated 48 V supply

Key specifications

• Output power: 300 W continuous
• Input voltage range: 25.2–46.8 V nominal (typical operating window noted)
• Output voltage: +48 V DC at up to 5.7 A
• Isolation: 4000 V DC input-to-output isolation
• Form factor: enclosed metal housing, dimensions 97 × 216 × 40 mm
• Standards: conforms to RoHS and railway standard EN50155

How to use

Install the converter in a ventilated location and secure it using appropriate mounting points compatible with the metal enclosure. Connect the DC input wiring observing polarity and ensuring the input voltage stays within the specified range. Connect the 48 V output to the load with suitable cabling and overcurrent protection sized for the nominal output current. Verify correct grounding and insulation before applying power. Allow the device to reach stable operating temperature and check output voltage under load to confirm proper operation.

Recommendations

To maximize service life and ensure reliable performance, avoid sustained operation above rated ambient temperatures, provide adequate ventilation or forced cooling in confined installations, and protect the unit from voltage transients and reversed polarity. Regularly inspect connections and consider adding upstream transient suppression for installations in environments with frequent electrical disturbances.