Abstract: An enclosure for an electromagnetic contactor is provided with upper (2) and lower (4) housings and a cover (6) over the upper housing (2), all comprised of molded insulating material. The upper housing (2) is joined to the lower housing (4) by inserting its lugs (2m,2n) in notches (4e,4f) and rocking it so that a pair of hooks (2o,2p) enter corresponding holes (4g,4h) at one end and a clamp (26) is pressed over a catch (2q) at the other end. A leaf bias spring (30) between the magnet frame (28) and the molded coil (32) applies force to the molded coil (32) which is pressed against the upper housing (2) so that the coil will not move but allows the magnet frame to align with the armature (40) or to move under armature impact, takes up slack between the upper (2) and lower (4) housings, biases the coil (32) rigidly against the upper housing (2) and allows the magnet (38,40) to move relative to the housings (2,4).