TeSys U short circuit current limiter block to be connected in series and upstream of a TeSys U starter controller.It increases the starter controller ability to withstand the short circuit current from 50 kA to 130 kA under 400 V.It includes a limiter cartridge LUALF1.To be mounted directly on the upstream terminals of a power base, it must be connected to one power base only.Green Premium compliant (RoHS/REACh).