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).