| 摘要 |
<p>A pair of incorrect fitting-preventing keys (30,60) in the form of a rod are able to prevent a receptacle connector (20) and a plug connector (50) of an electrical connector from being incorrectly fitted with each other. One ends of the keys are each formed to have a circular, triangular or more of polygonal cross-section, and the one end of one key is formed with a protrusion (601) and the one end of the other key is formed with a recess (301) so that shapes of the one ends of the keys are different from each other. The other ends of the keys are each provided with holding unit for the key, and the protrusion (601) of one key and the recess (301) of the other key are fitted with each other, thereby preventing any incorrect fitting of the receptacle and plug connectors. The pair of incorrect fitting-preventing keys (30,60) are simple in construction and detachable from the connectors (20,50) and are able to prevent any incorrect fitting with great certainty.
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