d contacts each present intermediate right angled bevel gears in a third embodiment fig1 the known cover 46 is replaced by a cover 92 allowing both an outlet for connection towards an additional electrical member outside the cover and additional electrical members inserted inside the cover 92 the more voluminous hollow body thus receives two ptcrs 93 94 inserted in series between the large wire line 3 and the small wire line 2 for this connection the two known contacts 47 48 have been replaced by four separate specific contacts 96 97 98 and 99 they each present a known first curved end intended to bear against each of the contacts of the well 32 33 42 and 41 respectively the shape of these contacts has therefore been adapted on the one hand to the geometry of the ptcrs 93 94 and on the other hand to the outlet for connection towards the outside of the cover the ptcrs 93 94 have been placed longitudinally inside the cover 92 one beside the other and slightly offset in the longitudinal direction inserted between the plans defined by the contacts of the well consequently one of the electrodes 93 b of one of the ptcrs 93 faces an electrode 94 b of the.