Siemens offers a wide array of thermal-magnetic circuit breakers that are the key element for overload and short-circuit protection of your home™s electrical system. To provide additional protection Siemens offers circuit breakers to protect against severe electrical shock or electrocution, mitigate the risk of electrical fires and protect against damaging surges and Voltage spikes. Circuit breakers are intended for switching and protection of your homes wiring from high temperatures caused by excess current higher than the rating of the wire. While thermal-magnetic circuit breakers are the key element for overload and short-circuit protection of your electrical system, there are potentially dangerous conditions that do not involve over current. Also known as -Siemens Energy Q2020NC 20-Amp Single Pole Twin Plug-In Circuit Breaker-1 Pole: Siemens Electrical Supplies 20 Amp 2-Pole Duplex Circuit Breaker Q2020NC-Siemens Q2020NC Circuit Breaker 1 Single Pole 20 Amp 1 Single Pole 20 Amp 120-Siemens Energy Q2020NC 20A Twin Siemens Circuit Breaker