The principle is simple and the cracking method is easy. One kind of power restriction is power restriction, that is, when the power reaches the set power (for example, 2000W), you can use it within the set power. There is also intelligent identification, based on the principle of resistive load. For example, electrical appliances that heat up quickly will trip and cut off power once they heat up. You can solve the problem by changing the phase angle of the circuit, that is, connecting a bridge to the electrical appliance, or connecting a relatively large AC capacitor in parallel to the electrical appliance, or connecting a relatively large diode in series (it is better to connect a bridge, because it is still very dangerous to get an electric shock and lead to a short circuit). This is the easiest way to crack. If you know something about this, it should be easy to solve. But the easiest way is that there is a special destroyer on the market to crack the socket and so on. The principle is similar to mine, and it is also very cheap. Just buy one for use.