Single phase, 120/240-Volt, 100 Amp main breaker load center with 12-spaces/24-circuits. Aluminum bus. Ground bar field installed. Combination head screws on neutrals, ground, trim, upper pan and bond screw provide installation flexibility. Single side inboard neutral. Invertible for bottom feed application. All ES series load centers allow the main breaker to be converted to main lug, but not vice versa. Mounting tabs on the trim hold it in place on the load center, freeing up both hands to drive the trim screws. Pre-positioned bond screw eliminated bond straps/screw assemblies and reduces the risk of losing components in the field. Insta-wire neutral/ground system allows for faster installation because screws arrive backed out, ready for wire insertion, the visible neutral and grounds systems also aids in the insertion of conductors. Rigid, sturdy base pan provides ruggedness required for harsh applications. NEMA type 1. Less breakers.