The safety edges are made in a durable material within which is housed the sensor (NO contact) which provides an electrical signal when any external pressure action is exerted on the ribbon switch. A profile of aluminum completes the device for its attachment to the machine. They are in a range of different profiles and sensitivities to suit various applications, perimeter protection, angular protection and other. The edges can be supply by special design of the customer. The housing material is EPDM or NBR. The connection with control unit are with two wire for non-safety application, two wire with internal resistor or four wire for safety application. They are also available in do-it-yourself kits for field fabrication and installation. The safety edges are compliant with EN 13856-2.
The edges in combination with PS3 control module can reach the CAT 3 - PL “e” how indicated in the ISO 13849-1 standard.

To choose the right bump switch for the application required, consider the following characteristics which define performance:

• Application, finger detection or other part of body detection.
• Activation force before closing of the internal contact.
• Internal contact activation after activation force.
• Overtravel distance after the contact closure