1P + N for: single-pole two-wire, that is, a single piece of air switch, and a leakage protection module combined with a switch, fire wire, zero wire together in and out of the combined switch, when leakage occurs leakage module driven air switch tripped, fire wire and outside the grid power disconnect, but the zero line is not open.
2P is: two-pole, two-wire leakage protector, a 2-piece air switch plus a leakage module. When the leakage occurs leakage module drives the air switch to trip, fire wire, zero wire are disconnected from the external grid electricity.
Leakage circuit breaker: leakage current in the circuit exceeds a predetermined value can be automatically actuated switch. Commonly used leakage circuit breaker is divided into two categories of voltage type and current type, and current type is divided into electromagnetic type and electronic type two.
Electricity leakage circuit breaker for the prevention of personal electric shock, should be based on direct contact and indirect contact with the two kinds of electric shock protection of different requirements to choose.
Expanded Information:
Select according to the purpose of use and the place where the electrical equipment is located
1) Direct contact electrocution protection
Because of direct contact electrocution of the hazards of the greater, caused by the consequences of the seriousness of the selection of higher sensitivity of the Leakage circuit breaker, electric tools, mobile electrical equipment and temporary lines, should be installed in the circuit of the action current of 30mA, action time within 0.1s leakage circuit breaker. For residential houses with more household appliances, it is best to install it behind the incoming energy meter.
If once electrocuted is easy to cause secondary injuries (such as working at height), should be installed in the circuit with an action current of 15mA, action time within the US leakage circuit breaker. For electrical medical equipment in hospitals, earth leakage circuit breakers with an action current of 6mA and an action time within US should be installed.
2) Indirect contact electrocution protection
Different places of indirect contact electrocution, can cause different degrees of personal injury, so different places should be installed in different leakage circuit breakers. For easy electrocution hazardous places, the requirement of a higher sensitivity leakage circuit breaker. In the wet place than in the dry place of electrocution risk is much greater, generally should be installed for the action current of 15-30mA, action time within 0.1s leakage circuit breaker.
For electrical equipment in the water, should be installed. Current 6-l0mA, action time within the US leakage circuit breaker. For the operator must stand on metal objects or metal containers in the electrical equipment, as long as the voltage is higher than 24V, should be installed with an action current of 15mA or less, the action time within US of the earth leakage circuit breaker.
Fixed voltage 220V or 380V electrical equipment, when the shell grounding resistance of 500fZ or less, a single machine can be installed with an action current of 30mA, action time within 0.19 leakage circuit breakers. For the rated current of 100A or more large electrical equipment or power supply circuit with multiple electrical equipment, can be installed with an action current of 50-100mA earth leakage circuit breaker, the grounding resistance of the electrical equipment in the following 1000, can be installed with an action current of 200-500mA earth leakage circuit breaker.
References: