The 700S-P safety control relay is designed with special features for use in safety circuits. It is designed to reduce the possibility of a welded contact and with external monitoring, a welded contact can be detected if one ever occurs. It features mechanically linked contacts for all N.O./N.C. contact pairs which allow detection of a welded contact in any of the poles. Contacts cannot be added, removed, nor changed so that the safety function is never jeopardized. Similarly, there is no ...push-to-test... function so that safety function is not jeopardized. Typical applications: use with E-stops, light curtains, safety gates, safety interlocks.