An electrical connector comprises a housing 51 having a plurality of electrical terminals 12 retained by respective lances 16, and a retainer 41 movable from a disengaged position to an engaged position to provide a secondary latch for the terminals 12. In order to prevent accidental forcible removal of the terminal 12, the retainer 41 includes a shutter 42 which, when the retainer 41 is in the disengaged position, occludes access to the terminals 12 and provides access to release openings 54, for the respective lances 16 only. In the engaged position, the shutter 42 provides access to the terminals 12 for connection with a mating connector.