The ABB THQLRK4 Pm Gold 125A Main Breaker Retainer is an essential component for enhancing the functionality and safety of your electrical system. Specifically designed for use in PowerMark Gold 6-42 circuit load centers, this retainer is compatible with THQL main breakers. It also serves as a reliable solution for main lug load centers that utilize a back fed branch breaker as a main. Unlike the THQLRK1, the THQLRK4 does not occupy a breaker space, allowing for more efficient use of your load center. This retainer ensures secure and stable installation, providing peace of mind and optimal performance for your electrical setup.