the lower wall of the housing 12 and has a right angled portion 30 thereof disposed interiorly of the cavity 18 and terminal 28 has attached rigidly thereto an electrically conducting blade member 32 blade member 32 extends in cantilever from the terminal 28 and has an aperture 34 formed therein with an inwardly extending spring portion tab 36 generally u shaped in side view formed integrally therewith which provides an over center snap action to the blade member blade 32 has a movable electrical contact 38 attached to the free end thereof and disposed directly above the stationary contact 24 the contact 38 being preferably attached to the blade member 32 by any suitable expedient as for example riveting a plunger member 40 has a reduced diameter portion 42 thereof slidably received in a bore 44 formed in plug 26 the plunger is biased in an upward direction by coil spring 46 which has the lower end thereof registered against plug 26 and the upper end registered against shoulder 48 provided on the plunger 40 plunger 40 has a notch 50 formed in the side thereof which notch has registered thereagainst the end of blade spring tab 36 to thereby form the u.