Single-phase, three-wire, 120/240 volt AC. (4) 1" circuits or (8) 1/2" circuits. One-piece interior removes and reinstalls easily. Full-length neutrals are easier to wire, reducing installation time and cost. Minimum 100 percent neutral terminations. Sturdy copper bus and galvanized box increase durability and reliability. Combination slotted/Robertson screws speed wiring. All holes are rated for 14-4 wire. 100 per cent rated split neutral on each side. Load centers accept Q Line circuit breakers, including GE's exclusive 1/2" THQPs. 10,000 AIC. 40 - 225 amp single phase devices have removable closing caps. TL load center enclosures are galvanized steel. 7-1/4" x 9" x 3". UL Listed.