The EC Series Electrically Coded Interlock Switch and Control Unit consists of a uniquely coded actuator, a read head (switch), and a control unit capable of monitoring up to four switches for applications with up to four guard doors. Guarding applications with more than four guard doors can be achieved by combining two or more control units in series. Each actuator has a uniquely coded element that cannot be reprogrammed, making the actuators secure against manipulation. The EC Series control unit provides EDM (External Device Monitoring, also called MPCE Monitoring) and may be operated in manual or automatic start mode, which allows the control unit to function as a safety monitoring relay. Each switch is available in cable lengths up to 25 meters or with an integral connector to accommodate a variety of application requirements.