MEAN WELL DC/DC Converter DDR-120A-24, 24V DC Output, 4.2A, DIN Rail Mount, Input 9 - 18V DC, Max Output Power 100.8W, 70°C

The MEAN WELL DDR-120A-24 is a high-performance DC/DC converter designed for demanding industrial applications requiring robust and reliable power conversion. With an ultra-slim housing and DIN rail mount capability, the unit provides efficient power delivery in compact panel spaces. Its primary function is to convert a wide input voltage range from 9V to 18V DC into a stable single output of 24V DC, delivering up to 4.2A and a maximum output power of 100.8W.

This converter is engineered with advanced protections including input reverse polarity, under voltage, reinforced isolation rated at 4kVDC, and multiple industrial certifications for operational safety and compliance. The output voltage is adjustable between 24V and 28V DC to accommodate flexible power requirements, while the noise and ripple specification of 50mV peak-to-peak ensures stable power for sensitive devices.

With a high efficiency of 88% and cooling via free air convection, the device operates reliably within temperatures ranging from -40°C up to 70°C, ideal for environments such as factory automation, transportation (bus, tram, metro, railway), industrial control, semiconductor equipment, and network/telecom systems. Its MTBF is rated at over 214,600 hours, supporting long-term deployment with minimal maintenance.

The DDR-120A-24 supports mounting on standard DIN rails (TS-35/7.5 or TS-35/15) and occupies minimal panel depth with its approximately 32mm wide design. Applications include powering industrial PLCs, process controllers, communication gears, and other electronics where consistent DC supply is critical. Built-in output voltage adjustment simplifies system calibration and integration.

This converter comes with reinforced isolation to protect downstream equipment and supports easy integration into existing industrial system architectures. The combination of compact form factor, robust protections, and adjustable output makes it a preferred solution for engineers managing complex automation, transportation, or network projects.

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