A latch assembly is operable to catch automatically and is releasable by hand. A component frame defines a clearance hole and a stop. A latch, also with a clearance hole, is mounted to the frame so that the clearance holes overlap. The latch is biased against the stop but is capable of pivoting away from the stop responsive to hand-applied pressure. A peg having a groove underneath a sloping top is mounted to a chassis or other surface against which the component frame is to be retained. As the component frame is lowered over the peg, an edge of the latch contacts the top of the peg, causing the latch to pivot so that the frame may be lowered into place. When the frame is in place, the latch pivots back and snaps into the groove.