Our TÜV-certified SIL coupling relays for safe switch-on and switch-off enable the electrical isolation of signals up to SIL 3. System downtimes can be reduced to a minimum by diagnostic functions, such as integrated proof test and line load monitoring. The SIL 3 coupling relays with ATEX, G3 coating, and temperature range up to 70°C are suitable for special applications in the process industry.