Lei Zhenzi applied to household protection against over-voltage lightning protection circuit

Household electricity is usually exchanged at 220V. Actual overvoltages often occur. Sometimes the power line is in series with the lighting line, and 220V becomes 380V. Sometimes the windy high-voltage line rides on the lighting line. Thunderstorms may also be connected to home lines. These conditions can cause damage to household appliances. Fire and personal injury can occur. In rural areas sometimes the entire village circuit is damaged at the same time. Therefore, it is imperative for households to protect against overvoltage and lightning strikes.

The following circuit has an important role in the safe use of electricity in the home to prevent the occurrence of the above situation.

Circuit As shown in the figure below, the key component of this circuit is a special resistor-varistor which can conduct AC, DC, and pulse voltages with a peak voltage higher than 360V in a discharge state so that the peak voltage at both ends does not exceed 360V. In turn, home appliances in parallel with this are protected.

In practical applications, the circuit is connected between the subscriber line and the household power line, and the ground line must be grounded reliably. When the circuit is protected, the varistor and the fuse are often burned at the same time. At this time, they must be replaced at the same time.

For simple application, the varistor can be directly connected in the switch box of the knife. In this case, the fuse is 2A. It should not be too large.

Lei Zhen subsidiary has a more comprehensive protection of the power lightning protection device - lightning protection module, standard 35mm rail installation, in the power line, can play a role in preventing the induction of lightning, residual voltage limit within 1000V can protect the electronic device from sensing Infringement of mine, the use of fire-retardant materials outside to completely avoid the fire, the modular structure is easy to maintain and replace the broken module, it is recommended to install in the user power distribution cabinet, installed behind the open, discharge the induction of lightning from the power supply line into the room Chung.