Engineered for value, the QO 200-amp 42-space main breaker, 42-circuit indoor load center is designed for fast installation, reliability, and superior circuit protection. With industry leading innovations and exclusive features, Square D QO Load Centers are the smart, safe, reliable choice. Engineered for a quick plug-on neutral breaker connection on every circuit, fewer connections, faster installation and no pigtails frees up gutter spaceFor protection from damage or theft on the job site, interiors can be easily removed with a single captive screwOverhead/underground feed simply by rotating the device before installingSingle phaseRated 120/240 VAC and 22000 AIR short circuit current ratingDesigned with straight-in mains to save expensive cable and timeSplit branch neutral with terminal screws backed out offering with up to 50 percent more terminals than UL requires increases wiring flexibility saving installation time and simplifies wiringThermoplastic interior is among the most rugged in the industrySlot/Square Drive screws let you use either standard flat blade screwdriver or square-head driver for positive drive and proper torqueConvertible mains allow you to meet changing job site requirements by field converting main breaker load centers to main lugs and vice versa