Selectronic Current Transformer 250A ELCT250/5:
All Selectronic SP PRO products have the ability to control and accept AC Source supplies larger than the internal wiring and contactor allows for. This is achieved by adding an external contactor and current transformer (CT) which works instead of the internal contactor and CT.
With this arrangement, AC Source supplies of up to 1000A (250A for firmware revision 8.0 or less) can be integrated into an SP PRO system.