CSRM relay modules comply with EN/ISO 13849-1Cat.4/PLe safety requirements and are suitable for monitoring various signals at the industrial sites with high safety requirements—including emergency stop signals, safety door switch signals, safety light curtain signals, safety light curtain signals using pulse output and two-hand button signals. ●With forced guiding of relay contact, the monitoring is more effective and safer; ●CSRM has smaller external dimensions, and it is connected using pluggable terminal for easy installation; ●CSRM has two forms, namely 3 NO (normally open) and 1 NC (normally closed) outputs, and 2 NO (normally open) and 1 NC (normally closed) outputs, so its control ability is stronger.