Cutler Hammer and Square D are both popular electrical panel brands. The main electrical panel is the heart of your home’s electrical system. All the power supplied by your utility company enters your home through this panel; this includes circuit breakers to prevent overloads, (too much power), of electricity into your home. At Mister Sparky® OKC, we are experts at working on both Cutler Hammer and Square D electrical panels, as well as many other brands.