Abstract: An electrical cord connecting receptacle, which may be of the grounding type, incorporates a mechanism which locks the current carrying conductor blades of a plug or cap to the current carrying conductors of the receptacle. The locking mechanism prevents the cap from being accidentally withdrawn from the receptacle under normal conditions of use. Through the use of spring-biased pins positioned to engage holes in the cap blades, the device provides for snap-in receipt of the cap blades, release of the cap by manual release of the pins, and emergency release by an unusually heavy pull on the cap.