Socket outlets, like those we sell, have mechanisms to lock the inserted cable during charging and we can supply EPCs for two different types:
Solenoid Locking System
Suitable for this socket, the EPC drives a solenoid with a simple 12V constant signal and the pin/lock releases on power off
Motorised Locking System
Suitable for this socket, the EPC uses motor-lock, motor-unlock signals to drive the lock & feedback implementation to ensure lock position. Note; the feedback has been designed for a 4 wire lock that is used in some of our charge points.