A connector (10) comprises a base (20), a cover (30), a protecting mechanism (35) and an actuator (40). The base defines a plurality of through holes (21) therein for receiving a plurality of contacts. The cover movably mounted on the base defines a plurality of passages in alignment with the through holes of the base. The protecting mechanism in the cover defines a hole extending therethrough, two stop members (341,342) are formed in inner surface of the hole. The actuator that can actuate the cover slide on the base, is rotatably assembled with the base and the protecting mechanism. The actuator has a protrusion thereon abuttable against either of the stop members during operation of the actuator, and is departed completely from the cover by the protecting mechanism.