In many legal systems, such as Germany, data centers and server rooms must be checked quarterly or annually for leakage current from the neutral conductor to earth (residual current monitoring). Our rack PDUs can be supplied with an (optional) Residual Current Monitoring (RCM) feature that fully automates this task without the need to schedule maintenance windows. With residual current monitoring, changes in the degree of insulation of a power supply can be detected early on, before protective devices are triggered by a residual current that puts people at risk and creates a fire hazard. We chose to use thebendertechnology in our RCD PDUs as they measure AC and DC leakage currents in the most reliable and accurate way. With residual current monitoring, changes in the degree of insulation of a power supply can be detected early on, before protective devices are triggered by a residual current that puts people at risk and creates a fire hazard.