CURRENT TRANSFORMER

The present invention discloses a current transformer which comprises a closed magnetic circuit and a secondary winding. A first part of the closed magnetic circuit completely surrounds a primary conductor, and a second part of the closed magnetic circuit forms the secondary winding, the second part of the closed magnetic circuit serves as a magnetic core of the secondary winding. The closed magnetic circuit forms a plurality of branch magnetic circuits at the second part, and a secondary winding is formed on each branch magnetic circuit, each branch magnetic circuit serves as a magnetic core of a corresponding secondary winding, each secondary winding is staggered with each other in at least one of the length, the height and the thickness. The current transformer of the present invention fully utilizes the idle space therein. A plurality of secondary windings are arranged in a spatial interleaving manner and a plurality of secondary windings are arranged in a spatial interleaving manner, the plurality of secondary windings significantly increase a total energy outputted by the circuit transformer. Larger output energy is obtained under a same volume, and a performance of the circuit breaker under a small current condition can be improved.