Electrical connector assembly

An electrical connector assembly includes: a first module including a mounting plate and a plurality of first electrical connectors; a second module including a housing and a plurality of second electrical connectors; wherein the electrical connector assembly has a locking device including at least one first interlocking member disposed on the first module and at least one second interlocking member disposed on the second module, wherein one of the first interlocking member and the second interlocking member is provided with a protrusion, and the other of the first interlocking member and the second interlocking member is provided with a hole for receiving the protrusion, wherein one of the projection and the hole is elastically actuatable so as to lock or unlock the first module and the second module.