current transformer 1 housing 2connection contact 3housing opening 4short-circuit device 105, 205, 305movable conductor 106, 206, 306sprung conductor 106, 206sliding contact 306 safety device 107, 207, 307 cover sleeve 107 flap 207 contact cover 307short-circuit device 108, 208, 308separation element 209arm 210guide pin 211detent lug 312