A manually operated switch having a toggle lever actuating mechanism included in a housing part which may be readily removed from a base carrying the stationary contacts of the switch to permit inspection of the current carrying contacts of the switch. The switch includes a slider which moves to an activated position when the housing part is removed from the base. The slider, when in the activated position, causes the levers of the toggle mechanism to move and be maintained in an OFF operating position so that the toggle mechanism must be reset after the housing is remounted on the base before the levers of the toggle mechanism can be moved to the ON position.