Abstract: This specification discloses a locking structure for a pair of matable electrical connectors. The locking structure includes a latch assembly formed on one of the connectors and a mating ramp. The latch assembly includes integral locking and lever arms which coact with the ramp to permit locking and unlocking of the connectors. During locking of the connectors, the locking arm rides up the ramp member to insure proper mating of the connectors and then down a rear, vertical wall. During unlocking of the connectors, the lever arm uses the ramp as fulcrum to raise the locking arm clear of the rear wall permitting movement of the locking arm over the ramp so that the connectors are easily unmated. The lever arm and the latch arm are connected at only one end thereby forming an elongated, generally V-shaped opening. This entrance is partially closed by a projecting guard so that wires cannot enter between the lever arm and the locking arm and get stuck.