A make and break inductive connector for transferring electrical energy, e.g. under water, by transformer action comprising two separable body parts (11) having mateable end faces (13). Each part has a cavity (15) extending into it from its end face and a magnetic pot core half (17) housed in the cavity so that the end of the pot core half is flush with the body part end face. Within an annular cavity (23) of each core half there is housed a toroidal electrical winding (25) and potting compound occupies the otherwise free space of the body part cavity, including the cavity in the pot core half, so as to enclose the winding completely and preclude direct contact between the winding and the pot core half.