Measure with an electric pen to find the zero line and the fire line. Then it is ok to correspond to this connection.
Generally, the blue is the zero line and the red is the fire line. Pay special attention to cut off the power supply before wiring, and the zero line and the live line cannot be connected backwards.
Extended data:
The upper end is the power supply end, which is connected with the power supply. The lower end is the load side and is connected with the load.
Wiring precautions:
For 1p+N leakage circuit breaker, the N pole has no overload protection function, that is, no current tripping function. If the power supply side is reversed, the live wire is still charged after the switch is turned off, because 1P+N just turns off the live wire and keeps the neutral wire open. If the input and output of the leakage protector are reversed, the tripping coil of the electronic leakage protector can't be cut off when the power supply is cut off, and it will be burned if it is energized for a long time.
Leakage protectors can be classified according to their protection function, structural characteristics, installation mode, operation mode, number of poles, action sensitivity and so on. Here, it is mainly described according to its protection function and use, which can be generally divided into three types: leakage protection relay, leakage protection switch and leakage protection socket.
1, leakage protection relay refers to the leakage protection device that has the function of detecting and judging leakage current, but does not have the function of cutting off and connecting the main circuit. The earth leakage protection relay consists of a zero sequence transformer, a release and an auxiliary contact for outputting signals. It can be used as the general protection of low-voltage power grid or as the monitoring protection of leakage, grounding or insulation of main road with high-current automatic switch.
2. When there is leakage current in the main circuit, because the auxiliary contact of the main circuit switch and the release are connected in series to form a circuit, the auxiliary contact connects the release, disconnects the air switch and the AC contactor, so that it trips and cuts off the main circuit. The auxiliary contact can also be connected with an acousto-optic signal device to send out a leakage alarm signal to reflect the insulation status of the line.
3, the function of the leakage protection switch, when the main circuit leakage or insulation damage occurs, the leakage protection switch can connect or disconnect the main circuit according to the judgment result. It can be combined with fuse and thermal relay to form a fully functional low-voltage switching element.
At present, this form of leakage protection device is the most widely used, and the commonly used leakage protection switches in the market are divided into the following categories according to their functions:
1, only has the function of leakage protection and power cut-off, and must be used with protective elements such as fuses, thermal relays and overcurrent relays.
2. At the same time, it has overload protection function.
3. It has both overload and short circuit protection functions.
4. At the same time, it has short circuit protection function.
5. At the same time, it has the functions of short circuit, overload, leakage, overvoltage and undervoltage.
Leakage protection socket refers to a power socket that can detect and judge leakage current and cut off the circuit. Its rated current is generally less than 20A, and its leakage current is 6 ~ 30 mA, so it has high sensitivity, and is often used for the protection of hand-held power tools and mobile electrical equipment, as well as in civil places such as homes and schools.