(19)

(11)

EP 0 366 775 A1

(12)

(43) Date of publication: 09.05.1990 Bulletin 1990/19 (21) Application number: 89905915.0 (22) Date of filing: 11.04.1989

(51) International Patent Classification (IPC):  G05B 19/ 05( . ) (86) International application number: PCT/US1989/001516 (87) International publication number: WO 1989/009952 (19.10.1989 Gazette 1989/25)

(84) Designated Contracting States: DE FR GB IT (30) Priority: 11.04.1988 US 19880180093 (71) Applicant: SQUARE D COMPANY Park Ridge, IL 60068 (US)	(72) Inventors: WATT, Kim, J. Milwaukee, WI 53224 (US) KSICINSKI, Charles, C. Whitefish Bay, WI 53217 (US) ROMANOWICH, Gary, A. Wauwatosa, WI 53222 (US) RYAN, Richard, L. Waukesha, WI 53186 (US) (74) Representative: Baillie, Iain Cameron  Ladas & Parry Altheimer Eck 2 D-80331 München D-80331 München (DE)