(19)

(11)

EP 2 499 648 A1

(12)

(43) Date of publication: 19.09.2012 Bulletin 2012/38 (21) Application number: 10775878.1 (22) Date of filing: 10.11.2010

(51) International Patent Classification (IPC):  H01H 59/00(2006.01) (86) International application number: PCT/GB2010/051874 (87) International publication number: WO 2011/058354 (19.05.2011 Gazette 2011/20)

(84) Designated Contracting States: AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR (30) Priority: 11.11.2009 GB 0919724 11.11.2009 EP 09275108 06.10.2010 GB 201016803 (71) Applicant: BAE Systems Plc. London SW1Y 5AD (GB)	(72) Inventors: PRITCHARD, Alan, Peter Filton Bristol BS9 7AR (GB) KEDDIE, David, Peter Filton Bristol BS9 7AR (GB) NIMAN, Murray, Jerel Chelmsford Essex CM2 8HN (GB) (74) Representative: Edis, Ronald Malcolm  BAE SYSTEMS plc Group IP Department P.O. Box 87 Farnborough Aerospace Centre Farnborough Hampshire, GU14 6YU P.O. Box 87 Farnborough Aerospace Centre Farnborough Hampshire, GU14 6YU (GB)