Patent ID: 7663459

Claim:
A short-circuit indicator ( 1 ) for arrangement on an electrical line ( 2 ) for electrical power distribution, comprising: a current transformer ( 4 ) having an induction coil ( 6 ) and an iron yoke ( 8 ) for surrounding the electrical line ( 2 ) to be monitored for a short-circuit current; said iron yoke being formed of a first yoke part ( 10 ) and a second yoke part ( 12 ), said first yoke part having a U-shaped configuration and being formed of a base web ( 14 ) and two opposite U-limbs ( 16 , 18 ); said induction coil ( 6 ) being seated on said base web ( 14 ) of said U-shaped first yoke part ( 10 ); said second yoke part ( 12 ) being connected in the form of a joint which can move between a closed position and an open position to one of said two opposite U-limbs ( 16 , 18 ) of said first yoke part ( 10 ); said second yoke part ( 12 ) forming a magnetic return path element for said first yoke part ( 10 ) in the closed position; said first yoke part ( 10 ) being split into two essentially L-shaped parts ( 10 a , 10 b ) in the area of said base web ( 14 ) to which said induction coil ( 6 ) is fitted; said second yoke part ( 12 ) having one of U-shaped and C-shaped configurations and being formed of two limbs ( 34 , 36 ) and a web ( 38 ) connecting said two limbs ( 34 , 36 ), said second yoke part ( 12 ) being connected by a joint ( 40 ) to the free end area of said U-limb ( 16 ) of said first yoke part ( 10 ) in the transitional area between said web ( 38 ) and one of said adjacent limbs ( 34 , 36 ); and said joint ( 40 ) being formed exclusively by uniform-material sections of said first and second yoke parts ( 10 , 12 ) without any additional separate hinge parts.