An electrical connector assembly comprising an electrical connector and a mating connector configured to be mated together, the electrical connector comprising: a housing; a fulcrum latch mechanism comprising a latch arm extending from a latching end to an actuation end, the latch arm being configured to rotate about a fulcrum that is located along the length of the latch arm between the latching and actuation ends, the latch arm being configured to rotate about the fulcrum such that the latching end is configured to move between a latched position and an unlatched position; and a connector position assurance device, the CPA device being held such that the CPA device is configured to move relative to the housing between a mated position and an unmated position, wherein the housing extends from a front to a rear and comprises a resiliently deflectable stop, the CPA device being configured to be loaded to the housing by deflecting the stop, wherein the stop restrains the CPA device from being unloaded from the housing once the CPA device has cleared the stop, characterised in that the housing includes two opposing guide rails that each receives a corresponding guide member of the CPA device therein and the guide rails of the housing are separate structures from the fulcrum latch mechanism, wherein the CPA device is movably held by the housing such that the CPA device is configured to move relative to the housing between a mated position and an unmated position and wherein the CPA device is movably held by the housing independently of the latch arm and the CPA device is configured to be loaded to the front of the housing and the stop restrains the CPA device from being unloaded from the front of the housing once the CPA device has cleared the stop. a housing; a fulcrum latch mechanism comprising a latch arm extending from a latching end to an actuation end, the latch arm being configured to rotate about a fulcrum that is located along the length of the latch arm between the latching and actuation ends, the latch arm being configured to rotate about the fulcrum such that the latching end is configured to move between a latched position and an unlatched position; and a connector position assurance device, the CPA device being held such that the CPA device is configured to move relative to the housing between a mated position and an unmated position, wherein the housing extends from a front to a rear and comprises a resiliently deflectable stop, the CPA device being configured to be loaded to the housing by deflecting the stop, wherein the stop restrains the CPA device from being unloaded from the housing once the CPA device has cleared the stop, characterised in that the housing includes two opposing guide rails that each receives a corresponding guide member of the CPA device therein and the guide rails of the housing are separate structures from the fulcrum latch mechanism, wherein the CPA device is movably held by the housing such that the CPA device is configured to move relative to the housing between a mated position and an unmated position and wherein the CPA device is movably held by the housing independently of the latch arm and the CPA device is configured to be loaded to the front of the housing and the stop restrains the CPA device from being unloaded from the front of the housing once the CPA device has cleared the stop.