A method of manufacturing an edge protector for a cathode plate includes inserting a first retention plate into a slit in a first edge strip, proximate an end of the first edge strip. The first retention plate is also inserted into a slit in a second edge strip, proximate a first end of the second edge strip. Additionally, the first retention plate is inserted into a gap of a first plug, such that the first plug abuts both the end of the first edge strip and the first end of the second edge strip. A corner cap is then overmolded on the end of the first edge strip, the first plug, and the first end of the second edge strip.