As an interface, interface relays connect the electronic control level, such as PLCs, with the level of sensors and actuators. They perform various functions: switching DC or AC loads with different resistive, inductive, and capacitive components, switching in the voltage range from a few mV to 250 V, switching in the current range from a few mA to 16 A, amplifying weak control signals, providing electrical isolation between control and load circuits, and signal multiplication. The CR-P series offers 9 different coil voltages with 1-2 changeover contacts. Two socket variants are available: standard socket and logical socket. Plug-in function modules such as reverse polarity protection, flyback diode, LED module, RC elements, surge protection, or timing modules expand the application areas of the plug-in PCB relays.