2 1 Phase PL Series Load Center Catalog Number Replacement Trim Kit Catalog Number Hinge Catalog Number. PowerMark Plus™ Thermoplastic PowerMark Plus Thermoplastic load centers feature a non-corrosive and highly durable enclosure ideal for indoor and outdoor applications. PowerMark Gold Feed-Thru Load Centers Include feed-thru lugs that can be used on main lug or main breaker interiors to feed additional load centers downstream. Make sure to consult a professional electrician when installing circuit breakers or anything else electrical. Search results for Breaker Panels / Load Centers Accessories. The box is recessed into a playroom wall.