The fault annunciator gateway family for switchgear panels. The functionality and the modular design of the devices with up to 192 inputs and corresponding output relays offer flexibility through individual processing for single signals and also for alarm- and operation states. Collective reports and repeat relays provide flexibility in alarm notification. Very bright two colour LEDs provide a very large reading angle. Parameterisation can be changed by buttons or via webinterface. The USM provides a gateway to acquire signals and convert them digitally to IEC 61850. Not only digital signals can be processed but also analog or temperature values can be monitored next to other values which can be read out via the new Modbus master integrated in the USM and transferred on the substation bus by IEC 61850.