Leakage Circuit Breaker Principle Leakage Circuit Breaker Selection

Leakage circuit breaker is mainly used to quickly cut off the power supply when personal electric shock or leakage occurs to protect personal safety and prevent electric shock accidents. Some leakage protectors also have both overload and short circuit protection and are used to stop the motor from starting frequently. Next Xiaobian introduced the principle of leakage circuit breaker and leakage circuit breaker selection.

Leakage circuit breaker principle

With the rapid economic development, in our daily life, leakage circuit breakers and leakage protection devices are widely used. It is believed that everyone will not be unfamiliar with leakage circuit breakers and leakage protection devices. The use of leakage circuit breakers and leakage protection devices is for us. Daily electricity safety has an important role that cannot be ignored. The circuit breaker functions as a switch during actual use, and at the same time, it can also automatically protect low-voltage electrical distribution equipment, which is equivalent to a combination of electrical components such as knife switches, fuses, and thermal relays. Circuit breakers are mainly used for short circuit and overload protection. The working principle is simply that any electrical appliance will generate heat during operation and the degree of heat generation is proportional to power.

Leakage Circuit Breaker Installation Notes

1. Before installation, check whether the data on the nameplate of the leakage circuit breaker is consistent with the usage requirements.

2. Do not install too close to high-current busbars and AC contactors during installation.

3. When the leakage circuit breaker operating current is greater than 15mA, the protective device shell must be reliably grounded.

4, should fully consider the power supply line power supply, voltage and system grounding.

5. Install an earth leakage circuit breaker with short-circuit protection and must ensure sufficient arcing distance.

6. The control circuit for the external connection of the combined leakage circuit breaker shall use copper conductors with a cross-sectional area of not less than 1.5mm2.

7. After installing the leakage breaker, the original grounding protection measures of the original low-voltage line or equipment cannot be removed. At the same time, the load-side neutral line of the circuit breaker must not be shared with other loops to avoid malfunctions.

8, the installation must be strictly distinguish between neutral and protective grounding. The neutral line of three-pole four-wire and four-pole leakage circuit breakers shall be connected to the circuit breaker. The neutral line of the circuit breaker can no longer be used as a protective grounding line, nor can it be repeatedly grounded or connected to the housing of an electrical device. The protective ground wire shall not be connected to the leakage circuit breaker.

9. The protection scope of the leakage circuit breaker shall be an independent circuit and it shall not be electrically connected with other circuits. Leakage circuit breakers cannot be used in parallel to protect the same line or electrical equipment.

10. After the installation is completed, the test button should be operated to check if the leakage circuit breaker can operate reliably. Under normal circumstances should be tested more than three times, and can be normal operation Caixing.

Leakage circuit breaker selection

1. For the purpose of preventing personal electric shock. Installed at the end of the line, use a high-sensitivity, fast-type leakage protector.

2. For the purpose of preventing electric shock, the branch line with the equipment grounded and used, the medium-sensitivity, fast-type leakage protector is selected.

3, to prevent the leakage caused by the fire and the protection of lines, equipment for the purpose of the main line should be used in the sensitivity of the delay-type leakage protection.

Editor's summary: The principle of leakage circuit breakers and the selection of leakage circuit breakers are introduced here. I hope to help everyone. If you want to know more related information, you can pay attention to this website information.

Molded case leakage circuit breaker