Siemens sirius single phase current monitoring relay digital spdt co siemens 3ug4622 1aw30 a current monitoring relay that will protect equipment against over current and undercurrent states in dc and 1 phase ac systems the relay features an lcd display to make setup and monitoring easy suitable applications include complete network monitoring with portable equipment and monitoring of the load of motors and the functionality of electrical loads siemens 3ug4622 1aw30 single phase current mon