Patent EA-002287-B1 (EA)
Title: A device for electrical connection of a differential unit to a circuit breaker
Inventor: LEBEAU BERNARD
IPC: H01H83/22
Filed: 1998-12-17
Abstract: 1. A differential unit comprising a device for electrical connection of said differential unit to a circuit breaker, comprising conductors designed to electrically connect the output terminals of the circuit breaker to the output terminals of the differential unit, said conductors passing through the toroid, wherein at least one of said conductors (6 to 9, 19) is a rigid conductor with a solid core, characterized in that said differential unit comprises at least one auxiliary module (3, 4) able to be plugged into the input face (24) of the differential unit case on each side of the toroid (5), wherein said rigid conductor has a first end (19a) electrically connected to the corresponding terminal of the circuit breaker and a second end (19b) welded at the end onto a contact strip (26 to 29) mechanically and electrically connected to the corresponding output terminal of the differential unit. 2. The device according to claim 1, characterized in that said rigid conductor is welded at the end onto one (36a), called first, of the ends of an intermediate conductor (36) passing through the toroid (T) whose second end (36b) is electrically and mechanically connected to the corresponding strip (26 to 29). 3. The device according to claim 2, characterized in that said intermediate conductor (36) is welded at the end onto the strip. 4. The device according to one of the claims 2 or 3, characterized in that the second end (36b) of the intermediate conductor (36) is in a single part with the strip. 5. The device according to any one of the previous claims, characterized in that said conductor (6 to 9) and/or intermediate conductors (36) is (are) single-strand. 6. The device according to any one of the previous claims, characterized in that said conductor (6 to 9) and/or said intermediate conductor (is) are made of copper. 7. The device according to any one of the previous claims, characterized in that said conductor(s) (6 to 9, 19) and/or intermediate conductor (36) present(s) a circular cross section. 8. The device according to any one of the previous claims, characterized in that the rigid conductors (6 to 9) and/or intermediate conductors (36) are shaped in such a way that the cross section of all the conductors together is substantially circular to minimize the space occupied thereby inside the toroid. 9. The device according to claim 8, characterized in that if the apparatuses being of the two-pole type, then the conductors (6 to 9) and intermediate conductors (36) if applicable are two in number and both present a semi-circular cross section. 10. The device according to claim 8, characterized in that if the apparatuses being of the four-pole type, then the conductors (6 to 9) and intermediate conductors (36) if applicable are four in number, each of the conductors presenting a cross section in the shape of a quarter-circle. 11. The device according to any one of the previous claims, characterized in that from the moment they enter the toroid (5), the conductors (6 to 9, 19) or intermediate conductors (36) extend in straight manner up to the strips (26 to 29). 12. The device according to any one of the previous claims, characterized in that the second end (19b) of the conductors) (6 to 9) and/or intermediate conductors'(36) is brazed-welded to the corresponding strip(s) (26 to 29). 13. The device according to any one of the previous claims, characterized in that between their two ends, the conductor (6 to 9) or intermediate conductor is (are) folded four times at right angles. 14. The device according to any one of the previous claims, characterized in that said conductor (6 to 9) and/or intermediate conductors is (are) covered with an insulating coating of epoxy type.] 15. The differential unit according to any one of the previous claims, characterized in that the auxiliary modules (3, 4) comprise a fault indication auxiliary and/or a remote opening module, and/or a leakage current indication module. 16. The differential unit according to any one of the previous claims, comprising a tripping finger (10) extending protruding out from the face (21) of said unit (B) designed to be adjoined to the circuit breaker, characterized in that it comprises a protection finger (32) extending substantially parallel to said tripping finger (10) over a slightly greater length than that of said finger (10) and designed to absorb the shocks instead of the tripping finger (10). 17. The differential unit according to any one of the previous claims, characterized in that the range of the differential unit B is a self-powered 125A range of all sensitivities including 30mA.