A 3 phase and neutral feeding cable connection from the grid side busbar connected to the interconnecting breaker sized for the power required.
A 125A switch to select the feeding connection for the auxiliary systems power supply.
A four pole circuit breaker with thermal-magnetic protection and a rating of 125A, with a breaking capacity of 50 kA, for the protection of the whole electric installation of the ancillary services. It will be equipped with residual current protection device and volt-free indication contacts. One of its indication contacts will be cabled to the PLC.