The Leuze MSI-SR-2H21-01 Safety Relay is designed as an evaluation unit for two-hand control devices in compliance with DIN EN ISO 13851 Type IIIC. It supports stop category 0 and monitors the synchronous actuation of devices. The relay operates with two-channel actuation, requiring one normally open contact and one normally closed contact for each channel. Restart is achieved through synchronous actuation, ensuring safety and precision in industrial applications.