Abstract: An apparatus has a lens. A frame has a gasket for receiving the lens and a shock-resistant housing is secured about the frame. A visual output element is disposed proximate the lens and an audio output element is disposed within the housing. A control component with a power source is provided for controlling at least one of the visual output element and the audio output element.

Abstract: An apparatus has a lens. A frame has a gasket for receiving the lens and a shock-resistant housing is secured about the frame. A visual output element is disposed proximate the lens and an audio output element is disposed within the housing. A control component with a power source is provided for controlling at least one of the visual output element and the audio output element.

Abstract: A two-link, trip-free operating mechanism assembly for a switch includes a first pivotally-mounted link comprising a switch lever arm. One end of the switch lever arm is coupled to the switch and a second end of the switch lever arm has a roller mounted thereto. A second link assembly includes a pivotable support member to which a cam member is mounted for rotation. The pivotable support member is selectively fixed during the closing of the contacts, or movable between a contact-closed position and an overriding open position. The cam member controls the state of the switch. In the tripped condition, the cam member and the roller are disengaged and the switch assumes a tripped, or open, state. A first spring arrangement applies a force to the link arrangement to cause the links to close from an open position. For trip-free operation, a second set of springs forces the switch arm link to immediately move to a switch-open position.