Modular jack

A modular jack having a mis-insertion prevention mechanism that prevents insertion of a modular plug having a number of pins other than a predetermined number of pins,

• the mis-insertion prevention mechanism comprising a mis-insertion determination unit and a stopper,
• the mis-insertion determination unit comprising a mis-insertion prevention guide mounted at the front of the mis-insertion determination unit that causes a modular plug having a different number of pins from the modular jack inserted into an opening in a housing of the modular jack to move traversely and an elastic support mounted at the rear of the mis-insertion determination unit that is fixedly supported at the rear of the housing of the modular jack,
• the mis-insertion determination unit disposed on either an upper left or an upper right top part inside the opening in the housing of the modular jack,
• the stopper formed on a portion of the roof of the housing on a side opposite the side on which the mis-insertion determination unit is disposed in a lateral direction of the opening,
• the mis-insertion prevention mechanism preventing advance of a modular plug having a different number of pins from the modular jack mistakenly inserted into the opening in the housing of the modular jack beyond a point at which a portion of the modular plug contacts the stopper.