A trip unit link adapted to be placed underground (130.230, 330.430) for a releasable connection between a first network (105) electricity distribution and a second network (110) electricity distribution unit comprising disconnection link receptacle (201; 301; 401) provided with an inlet (203; 303) to insert a wire (205) input network of the first network electricity distribution and with an input (207) to insert a wire ( 209) input network of the second network electricity distribution, comprising the housing receptacle: - number of first connection posts for respective elements disconnectable link for connection / disconnection of the second distribution network electricity / from the first grid electricity to connect or disconnect the electricity supply to the second power distribution network, corresponding d icho number of first connecting poles to the number of phases of voltage held by the cable (205; 209) network input of the first and second electricity distribution network, and - a device (215-1, 215- 2, 215-3; 315-1, 315-2, 315-3) for deriving signals indicative of power consumption of the second power distribution network, said device being associated with a respective first connection post, and wherein each disconnectable link elements that can be received in the first connection posts can be connected to a phase voltage of the first electricity distribution network and a phase voltage of the second power distribution network.
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