Relay modules with forcibly guided contacts Relays with forcibly guided contacts have a 99 % diagnostics coverage and an excellent reputation for use in safety systems. The contacts interlock mechanically with each other in order to ensure a synchronous switching status of both contacts. This guarantees that the alert contact will maintain the same switching status in the event of an error (for example, if the working contact welds from an overload). The controller (or safety controller) detects the alert contact and then compares the set values and actual values. If a difference occurs, measures can then be taken to protect equipment and human life. • 2 CO contacts with 6 A, forcibily guided according to EN 61810-3 type B • Proven component in safety technology<br /> • Diagnosis coverage of 99 %