The bumper and safety cut-off is built up of a soft polyurethane foam, in the interior of which contact chains are disposed immediately adjacent to the actuating faces. The number and the positions of the contact chains depend on the size and the intended application of the bumper. For rail-bound vehicles or rectilinear machine movements normally only the front side of the bumper serves as the actuating face.
The safety cut-off bumper sensor is built up of mechanically opening N/C contacts connected in series, in the form of a contact chain.
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An often critical feature for any electrical component, of course for safety edges, too, is sealing. Ingress of humidity or water may lead to failures. Critical for sealing, in a safety edge, is the interface between rubber profile and end caps being normally glued to each other.