(19)

(11)

EP 0 619 888 A1

(12)

(43) Date of publication: 19.10.1994 Bulletin 1994/42 (21) Application number: 93902773.0 (22) Date of filing: 28.12.1992

(51) International Patent Classification (IPC):  H03K 17/ 95( . ) (86) International application number: PCT/US1992/011233 (87) International publication number: WO 1993/013436 (08.07.1993 Gazette 1993/16)

(84) Designated Contracting States: DE FR (30) Priority: 31.12.1991 GB 19910027570 (71) Applicant: SQUARE D COMPANY Palatine, IL 60067 (US)	(72) Inventors: CALDER, Douglas, William, Hudson Hungerford, Berkshire RG17 0DQ (GB) BIZLEY, Arthur, James 43 Saffron Close Swindon, Wiltshire SN4 7JB (GB) (74) Representative: Fitzpatrick, Alan James, et al  Fitzpatricks, 4 West Regent Street Glasgow G2 1RS, Scotland Glasgow G2 1RS, Scotland (GB)