Amazon: single breaker box Amazon's Choice for single breaker box. by Amazon. More Buying Choices $11 (30 new offers) SQUARE D BY SCHNEIDER ELECTRIC QO200TRNM 60A Non Fuse Disconect. 4.7 out of 5 stars 94. $18 $ 18. 99. Get it as soon as Tue, Mar 17. POWERTEC 71008 110/220V Single Phase On/Off Switch. 4.4 out of 5 stars 291. $11 $ 11. 99. Get it as soon Getting to Know Your Fuse Box and Safety Tips | Direct In North America, these wires are actually two 110-120 volt AC power mains and one neutral line. These wires connect in the electric meter and then extend inside your home via a connecting wire to fuse box or circuit breaker equipment. The neutral wire is connected to the neutral/ground bus bar.