ABB's CR-M series pluggable interface relays are designed for robust electrical isolation, amplification, and signal matching in industrial automation systems. They bridge the gap between electronic control systems like PLCs and PCs, and the sensor/actuator level. These relays are overload-proof, protecting against short-time voltage and current peaks. Available in various configurations including different coil voltages (DC and AC) and contact arrangements (2/3/4 c/o), they offer flexibility for diverse applications. Options include LED indication, gold contacts for improved conductivity, and free-wheeling diodes for protection. Integrated test buttons allow for manual actuation and locking of output contacts.