The UM400D01-01 hot-swappable DC power supply modules are designed to be compatible with S5850-48S6Q, S5850-48S2Q4C, S8050-20Q4C Ethernet switches and T5850-48S6Q, T5850-48S2Q4C, T8050-20Q4C TAPs. It can be hot-swapped and replaced without any system down-time offering a seamless and uninterrupted operation, which provides a low-cost, simple solution to the problem of a failure of the internal power supply of an Ethernet switch.