Abstract: A catch for a spring loaded hinged lid of a Jack-in-the-box consists of lever, one end of which obstructs an inclined lip on the edge of the lid opposite the hinge. The other end of the lever is held by magnetic attraction to a ferromagnetic plate which is fixed with respect to the box.In the vicinity of the magnet is an electrical solenoid which when pulsed by charge stored in a capacitor produces a magnetic field which opposes the field of the permanent magnet and releases the lever. This in turn releases the lid. When the solenoid is pushed the magnet momentarily releases the plate. Once separated the force of attraction is no longer sufficient to overcome the force exerted on the other end of the lever by the lid spring via the inclined lip.