(19)
(11) EP 0 517 295 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
10.03.1993 Bulletin 1993/10

(43) Date of publication A2:
09.12.1992 Bulletin 1992/50

(21) Application number: 92201448.5

(22) Date of filing: 21.05.1992
(51) International Patent Classification (IPC)5: H01H 33/91, H01H 33/02, H01H 33/53, H02B 13/075, H02B 13/035
(84) Designated Contracting States:
AT BE CH DE DK ES FR GB GR IT LI LU NL PT SE

(30) Priority: 24.05.1991 IT MI911435
24.05.1991 IT MI911436
17.06.1991 IT MI911652

(71) Applicant: Tosi, Giampietro
I-20072 Castiglione D'Adda, Milan (IT)

(72) Inventor:
  • Tosi, Giampietro
    I-20072 Castiglione D'Adda, Milan (IT)

(74) Representative: Fusina, Gerolamo et al
Ing. Barzanò & Zanardo Milano S.p.A, Via Borgonuovo, 10
I-20121 Milano
I-20121 Milano (IT)


(56) References cited: : 
   
       


    (54) Medium voltage switch with three positions insulated in sulphur hexafluoride


    (57) A medium voltage operating-isolating switch with three positions insulated in sulphur hexafluoride comprising a set of three poles, each pole comprising a fixed contact (14) and a mobile contact (26), the fixed contact carrying an associated male arcing contact (17) and the mobile contact being arranged on a pivoted arm (25) rotatable between a first closed position in engagement with the fixed contact, a second isolated position and a third earthed position. The mobile and fixed contacts of the set of three poles are arranged on three insulating base support elements (11) fixed to a single support beam (12), a relative cylinder (13) which pumps the sulphur hexafluoride into the insulating nozzle (15) being associated via an insulated lever with each of the arms carrying the mobile contacts, a metal draining element (44) being provided between each of the insulating support elements and the pumping cylinders.






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