Abstract: An electromagnetic door lock comprises in combination a convex armature plate and oblong magnet whereby the plate is flattened into full contact with the magnet when energized. De-energizing the magnet allows the plate to spring back to the convex shape and elastic means to instantly separate the armature from the magnet. One or more reed switches are located in cavities in the support bracket for the magnet. The reed switches are positioned to sense a substantial change in the leakage flux caused by an "air gap" between the armature and the magnet and thereby infer full locking or unlocking of the door lock.