An electromagnetic actuator including a magnetic housing, a coil that is rigidly connected to the housing and is capable of being connected to an electric circuit, a magnetic core that is arranged in the coil and can move along a central axis defined by the coil and according to the strength of the current flowing in the coil, and a shunt that is arranged in the coil and includes a magnetocaloric material the magnetisation of which is temperature-dependent. The shunt is arranged in the coil along the central axis along a length so as to create an air gap between the shunt and the magnetic core. The actuator further includes a device for attaching the shunt to the housing that are designed to adjust the length.