Contact pairs of rectangular connectors, there are pinhole type (such as CD type), curved reed-round contact pin type (such as CA type), curved reed-flat contact pin type (such as CB type), curved reed-bend Reed type, round pin-wire spring socket type, tubular socket-twisted wire pin type, etc. The rectangular connector is mostly locked with a lock, which is locked by the lock spring and the flange on the side of the shell, and the structure is simple. 

 
The classification of rectangular connectors and printed board connectors, strip connectors, and ribbon cable connectors is sometimes not strictly limited. For the same type of connector, some manufacturers are classified as rectangular connectors (approximately rectangular in shape), some are classified as printed board connectors (used in printed circuits), and some are classified as strip connectors (approximately long in shape). bar), and some are classified as ribbon cable connectors (with ribbon cables attached). It is widely used for indoor cable connection, internal connection of equipment and occasions requiring multiple rows of assembly.