Plug and plug connector for robots

A plug for a tool changing system for electrically connecting a tool to a robot hand, comprising

• a plug housing configured to be fastened on a robot arm or on a tool, wherein said plug housing comprises at least one contact chamber and at least one accommodating chamber, which is arranged substantially above the contact chamber;
• a connection module having with electrically conductive elements configured to be connected to at least one first peripheral device said connection module can be arranged in the at least one contact chamber, and
• a wear module having electrically conductive elements configured to be connected to a second peripheral device;
• wherein the connection module and said wear module are arranged in the at least one accommodating chamber;
• wherein the electrically conductive elements of the connection module can be connected to the electrically conductive elements of the wear module;
• and
• wherein the at least one accommodating chamber is arranged in a frame element which is configured separately from the plug housing, wherein the frame element can be connected to the plug housing.