In order to ensure life safety, differential circuits breakers are employed. These devices are usually made of different parts. One of the parts that will be described in this paper is the electromagnetic relay. The actuator must be modeled with a great accuracy in order to predict if the circuit breaker will open of an eventual fault occurs. In this paper, the dynamical behavior of the relay is studied. Two accurate dynamical laws of the magnetic material are taken into account and tested.
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