Why does the IP protection class of the CSMshunt differ between IP54 (CSMShunt 125A and 250A) and IP67 (CSMShunt 2.5A and 25A)?

The difference in the IP protection class of the CSMshunt is due to the following reasons:

1. the housing of the large CSMshunts (125A and 250A) must be opened to install the current-carrying wires. The wires are mounted inside the housing using M6 screw bases.
   There are four screws to open the housing. The screws and also the whole cover is not sealed and therefore does not meet the IP67 protection class.
2. the current-carrying wires must be mounted inside the housing so that the shunt can be integrated into the current path. The cable gland of the housing stabilizes the wire and protects the housing maximally against splash water.
   The small CSMshunts (2.5A and 25A) are supplied with unassembled copper stranded wire. With this variant, the housing does not have to be opened to integrate it into the current path. For this reason, the housing is sealed and achieves protection class IP67.