Incorrect. Circuit breaker is installed after the gahmen wires in yor house. It has 2 functions.
1. It was to arrest any spike or surge in voltage, say 10,000 volts, from the mainpower station. It trips the CB off. As little as 5 mA of current will trip the CB. This stop the surge curren, the spike, from damaging or burn you PC, fridge, TV and anything in between.
2. CB also prevent death of traders and and family. If there is an open live wire around and if an animal or human touched it the CB will trip cut of current and saves life.
If there is a leak of current in equipment or devices and human touch it will get electrical shocks and trip the CB. Without CB the human hands will get burn or for higher voltage equipment his hand or body is stuck to the equipment and died.
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