They are utilized to prevent collision of the operator against vehicles or movement machines. The bumpers are able to absorb the impact and to produce a signal to stop the machine. The operating principle is very simple. With a minimum compression of the bumper, after a pre-travel, the internal contact produces the command signal for stopping the machine. After the pre-travel the bumper allows yet to compression (over-travel) that permit to cushion the impact of the person against the machinery. This sensing device utilizes a highly durable and flexible thermoplastic material which when pressed, closes the internal sensors. They are formed by a polyurethane foam (designed under customer drawing) with ribbon switches incorporated inside. The bumper is designed for fail-safe circuit to ensure proper monitoring of the system.

The safety bumper is compliant with EN 13856-3.