Siemens PN Series Load Centers – a high quality and feature-rich line of load center products designed to meet applications for virtually every need. The PN Series load center provides maximum flexibility in combination with labor saving features to aid the contractor while installing the product. PN Series load centers accept the plug-on neutral breakers, patented insta-wire neutral/ground system, convertibility, copper bussing and mounting tabs on the trim – these features were specifically engineered to decrease installation time and increase flexibility.