2P refers to two-pole two-wire leakage protector, two-piece air switch and leakage module. When leakage occurs, the leakage module drives the air switch to trip, and the live wire and neutral wire are electrically disconnected from the external network.
Leakage circuit breaker: a switch that can automatically act when the leakage current in the circuit exceeds a predetermined value. Commonly used leakage circuit breakers are divided into voltage type and current type, and current type is divided into electromagnetic type and electronic type.
Leakage circuit breakers are used to prevent electric shock, and should be selected according to the different requirements of direct contact and indirect contact.
Extended data:
According to the purpose of use and the location of electrical equipment.
1) to prevent direct contact with electric shock
Because direct contact and electric shock are extremely harmful and have serious consequences, the leakage circuit breaker with high sensitivity should be selected. For electric tools, mobile electrical equipment and temporary lines, leakage circuit breakers with operating current of 30mA and operating time of 0. 1s should be installed in the circuits. Residential buildings with more household appliances should be installed behind the household watt-hour meter.
If electric shock may cause secondary injury (such as aerial work), a leakage circuit breaker with the operating current of 15mA and the operating time within our scope should be installed in the circuit. For electrical medical equipment in hospitals, leakage circuit breakers with working current of 6mA and working time within the scope of the United States should be installed.
2) Indirect contact electric shock protection
Indirect contact and electric shock in different places will cause different degrees of harm to people, so different leakage circuit breakers should be installed in different places. For places that are easy to get an electric shock and harmful, it is required to use leakage circuit breakers with high sensitivity. The danger of getting an electric shock in a wet place is much greater than in a dry place. Generally, leakage circuit breakers with operating current of 15-30mA and operating time of 0. 1s should be installed.
For electrical equipment in water, leakage circuit breakers with working current of 6- 10 mA and working time within the scope of the United States should be installed. For electrical equipment whose operators must stand on metal objects or in metal containers, as long as the voltage is higher than 24V, leakage circuit breakers with operating current below 15mA and operating time within the scope of the United States should be installed.
For fixed electrical equipment with voltage of 220V or 380V, when the grounding resistance of the shell is below 500fZ, a single machine can be equipped with a leakage circuit breaker, the operating current is 30mA, and the operating time is within 0. 19. For large electrical equipment with rated current above 100A or power supply circuits with multiple electrical equipment, a leakage circuit breaker with working current of 50- 100 Ma can be installed, and a leakage circuit breaker with working current of 200-500mA can be installed when the grounding resistance of electrical equipment is below 1000.
References:
Baidu encyclopedia-leakage circuit breaker