Complete strategy for choosing leakage protector:

1.Must choose the product that accords with national technical standard

At present, the single - phase leakage protector on the market are current - type.On July 1, 1987, the national standard gb6829-86 "leakage current action protector" was promulgated, which put forward specific requirements for the technical conditions and test methods of current type leakage protector products.In the same year, the state machinery commission issued a document stipulating that a compulsory safety certification system should be implemented for leakage current action protectors, which was organized and implemented by China electrical product certification commission.Safety certification of qualified products will be issued to the enterprise production license.Therefore, when choosing single-phase household leakage protector, the user must choose the product that conforms to bg6829-86 and has passed the safety certification.This kind of product is printed on the manufacturer's product operation manual with the description of "passed the safety certification of China electrical products certification committee, certificate number ××××, conforming to the standard: BG6829 one 86".

2.The technical performance indexes of the selected products should meet the needs of household electricity

The technical performance indexes of single-phase leakage protector products are as follows:

(1) rated voltage and frequency

The rated voltage of leakage protector has two kinds: ac 220V and ac 380V, which are single-phase electric power for family life, so the rated voltage should be ac 220V / 50Hz products

(2) rated current, overcurrent trip rated current

The rated current of leakage protector mainly includes 6, 10, 16, 20, 40, 63, 100, 160, 200, 250, 400A and other specifications.For the leakage protector with overcurrent protection, there are several overcurrent trip rated current values in the same grade of rated current.Such as dzl18-20/2 type leakage protection, it has leakage protection and overcurrent protection function, its rated current is 20A, but its overcurrent trip rated current has 10A, 16A, 20A kind, that is, the same is dzl18-20/2 model of products, there will be three different specifications, should be paid attention to when choosing.Under the working voltage of ac 220V, the user can roughly estimate the rated current of leakage protector according to the current of 4.5 ~ 5A of 1kW load.If the total power of a household electrical equipment is about 4kW, the single-phase leakage protector with the rated current of 20A should be used.The rated current of overcurrent tripper should be selected as close as possible to the actual current of household electricity consumption.In the example above, the home electric equipment is 4 kw power combined, but general family all electrical equipment at the same time open the opportunity to work is very few, and for a piece of electrical equipment, also must be under full load at work, so the case on the family if choose with over-current protection of single phase leakage protector, the tripping device rated current elected as 16 a relatively appropriate.In general, you can put 0.85-0.The rated current value of 9 times is determined to be the rated current value of the overcurrent trip device.

(3) number of poles

Leakage protector has 2 pole, 3 pole, 4 pole three kinds, family life electricity should choose 2 pole leakage protector.

(4) rated leakage operating current

Rated leakage action current refers to the leakage current value that must be operated by the leakage protector under the conditions specified by the manufacturer.The rated leakage action current of leakage protector mainly includes 5, 10, 20, 30, 50, 75, 100, 300, 500, 1000, 3000mA and so on.Among them, those less than or equal to 30mA are highly sensitive;Sensitivity in genera greater than 30mA and less than or equal to 100mA: sensitivity in genera greater than 1000mA is low.Family life electricity by the selection of leakage protection, the main purpose is to prevent personal shock, it should choose rated leakage action current is less than or equal to 30mA high sensitivity products.In fact, if it can be used as personal protection against leakage of electricity, it can certainly be used as protection against leakage of electricity fire and equipment damage.

(5) rated operation time of leakage

Rated leakage operating time is the maximum leakage breaking time corresponding to rated leakage operating current under the conditions specified by the manufacturer.The rated operating time of single-phase leakage protector is less than or equal to 0.1 second, less than 0.15 seconds, less than 0.Two seconds and so on.Less than or equal to 0.1 second for the rapid type of leakage protection, used to prevent personal shock is the main purpose of single-phase leakage protection for the family, should choose less than or equal to 0.1 second fast product.