Patent ID: 9419729
Filing Date: 2016-08-16
CPC Classification: H01H,H04B

Claim Text:
1. A branching unit for an optical telecommunication link, the unit comprising a first, a second and a third terminal for termination of conductors of respective branch cables in use, a fourth terminal for connection to a sea earth in use, and a circuit comprising a plurality of relays comprising at least a first, a second and a third relay associated to respectively the first, second and third terminal, the circuit being structured for connecting together two terminals out of the group consisting in the first, second and third terminal and for connecting to the fourth terminal the remaining terminal of the group consisting in the first, second and third terminal, depending on a sequence of power feeding at the first, second and third terminals, in use, wherein the circuit comprises a sea earth circuit terminated at one end to the fourth terminal and a bidirectional triode thyristor placed along the sea earth circuit, and wherein the branching unit comprises a driving circuit for driving the bidirectional triode thyristor, the driving circuit being configured for triggering the bidirectional triode thyristor in a conduction state after complete switch-over of one relay of the group consisting in the first, second and third relay.