The DRM40 series of 20-40A DIN rail redundancy power modules use MOSFETs to block reverse currents for a low 200mV voltage drop. With a 40A load, the power loss is just 8W.
A low internal voltage drop in a redundancy module is important for two reasons. It saves on energy costs, and reduces the voltage drop between the power supply and the load. A large voltage drop may require time-wasting adjustment of the power supply output voltages to compensate.
More information about the key features and specifications are on the DRM40 datasheet found via this link: www.emea.lambda.tdk.com/uk/drm40
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