Abstract: An inductive current measuring sensor is provided comprising several coils connected electrically in series and disposed in a polygonal contour, so as to surround the conductor on which it is desired to measure the current. Each coil comprises windings disposed on an insulating bobbin and connection elements. The bobbins are disposed on the face of a printed circuit having a central recess through which the conductor may pass. The printed circuit carries conducting tracks interconnecting the fixing points of the connection elements together and to external connection members.

Abstract: A coupling piece (12) which is connected to a mobile component (18) of the contactor, has two stepped thrust surfaces (19, 20), each able to cooperate with one of two locking levers, (23, 24), both of which are repelled by an electromagnet (32) when the contactor is turned off. This device is particularly advantageous when the mobile components of the contactors move over different distances.