second arm of the u shaped yoke 103 and that the armature 107 covers the first arm of the u shaped yoke 103 that is the armature 107 closes an opening of the u shaped yoke 103 and constitutes a closed magnetic circuit when the coil 102 is energised two common contacts 1 c and 2 c are formed in respective extending end portions of the springs 401 and 402 two break contacts 1 b and 2 b not seen in fig6 are placed above the common contacts 1 c and 2 c respectively that is the two break contacts 1 b and 2 b are mounted on a bottom surface of and are electrically connected together by an electrically conductive break contact substrate 603 further two separate make contacts 1 m and 2 m are placed under the common contacts 1 c and 2 c the break contact substrate 603 is attached to a break contact support member 604 which is erected perpendicularly on the substrate 101 and formed in a reversed l shape the electrically conductive member provided inside the break contact support member 604 connects the break contact substrate 603 to a break terminal not shown protruding downward from the substrate 101 the two make contacts 1 m and 2 m are placed i e formed on the upper surfaces of laterally extending end portions 112 a and 113 a of the two make contact support members.