Current transformer, protection device and electrical circuit breaker including such a transformer

The current transformer (1) includes a magnetic circuit (2) made of magnetic material that is intended to be placed around a primary conductor (3), and a secondary winding (4) that is wound onto a portion (5) of said magnetic circuit (2) in order to deliver a secondary current to processing circuits (32). In this current transformer, the magnetic circuit (2) comprises at least one device (6, 6A, 6B) for varying the magnetization of a portion of said magnetic circuit according to the temperature in order to limit or to decrease the magnetic flux in the magnetic circuit when the temperature of the magnetic circuit increases. The protection device and the electrical circuit breaker including such a transformer are also provided. 一种电流互感器(1)，包括由磁性材料制成的用于放置在初级导体(3)周围的磁路(2)，以及缠绕在所述磁路(2)的部分(5)上以便向处理电路(32)输送次级电流的次级绕组(4)。在该电流互感器中，所述磁路(2)包括用于根据温度改变所述磁路的部分的磁化的至少一个装置(6，6A，6B)，以便当所述磁路的温度升高时限制或减小所述磁路中的磁通量。包括这种互感器的保护装置和电路断路器。