The bumper and bumper security category 3 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 bumper security category 3 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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The sensor part of the safety edge is positioned directly behind the front portion of the rubber profile. Separation of the contact position does not rely on a bending of the contact chain, but on the re-direction of the external radial forces to internal axial forces.