No more replacing devices when a terminal is defective! The innovative housing design for the SIRIUS 3SK1 Safety Relays makes it possible to replace a defective terminal individually: just open the cover flap, detach the wiring of the terminal, push up the terminal fastener and remove the defective terminal. Then snap the new terminal into the fastener, reconnect the wires and close the cover flap. Done! The rest of the wiring stays just as it is, saving both time and effort.