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一、Scope of Application

DZL18 Molded Case Circuit Breaker (also known as DZL18 leakage protection MCCB), for single-phase circuit of AC 50Hz, rated voltage of 230V, rated current of 40A. Its main function is to provide indirect protection for personal electric shock of fatal danger. At the same time, DZL18 Lv circuit braker can also prevent electrical fire hazard caused by ground fault current from damaged equipment insulation.
DZL18 leakage protection MCCB have small size, high breaking, reliable action and good vibration and other characteristics, can be widely used in electric water heaters, solar water heaters, vending machines, drinking fountains, refrigerators, washing machines and other electrical equipment to provide electric shock protection and leakage protection, is the ideal product for users. DZL18 leakage protection MCCB can replace NL18-20, 32.
Meet the standards: GB16916.1, IEC61008-1.

二、Model and meaning

三、Normal working conditions and installation conditions

■ The altitude of the installation site should not exceed 2000m.
■ Ambient air temperature is -5℃~40℃, and average temperature in 24h is below +35℃.
■ Atmospheric relative humidity in the ambient air temperature of +40℃ is not more than 50%, the wettest month average max relative humidity is 90%, while the average minimum temperature is +20 ℃ in the month.
■ Installation category: Ⅲ.
■ The inclination of the installation position and the vertical plane is not more than 20°. Installed in the place without significant impact vibration and invasion of rain and snow. The magnetic field near the installation place should not exceed 5 times of the geomagnetic field in any direction.
■ Pollution Degree: 2.

四、Main parameters and technical performance


Frame rated current(A)

Rated current(A) Pole

Rated residual

operating current(mA)

Rated residual

non-operating current(mA)

Rated making-breaking capacity(A) Max breaking time(s)
I△n 0.25A
DZL18-40 40 40 2 30 15 500 0.1 0.04

Type of DZL18 Molded Case Circuit Breaker:

The residual current operated circuit breaker is an electronic quick type residual current protection circuit breaker;
The residual current operated circuit breaker is the impact current non-operating type;
The residual current operated circuit breaker regards the main power supply as the auxiliary power supply.

Mechanical and electrical operation performance

Frame rated


Operation cycle times Of which

Operation cycle

times per hour

On-load No-load
40 3000 2000 1000 120

Structure and working principle

The residual current operated circuit breaker is a current action type electronic quick residual current operated circuit breaker. The main components are: the zero-sequence current transformer manufactured by the high permeability material, the electronic component board, the residual current release and the test device. All parts are installed in a pair of plastic case;
When there is the leakage current in the protected circuit, current vector sum of primary coil through the zero-sequence current transformer is not equal to zero, secondary coil of zero-sequence transformer generates the induced voltage and amplifies through the electronic components board, when the value reaches the set value, the residual current release cut off the power supply within 0.1s to protect circuit. The operation principle (see Fig).

五、Outline and installation dimension

六、Use and maintenance

1, The leakage protection circuit breaker vertical bone fixation (please use cross screwdriver to prevent damage to the shell).
2, The power supply line must be above the leakage circuit breaker, that is marked "power" at the top of the load wire (including the neutral line), must be through the leakage circuit breakers, and load neutral must be insulated
3, Leakage protection circuit breaker handle in the "OFF" position that the sub-gate, in the "ON" position that the closing state, turn on the power.
4, Leakage protection circuit breakers due to failure of the protected circuit and sub-gate, should identify the cause, troubleshooting can be carried out after the closing operation.
5, Leakage protection circuit breakers in the new installation or operation after a certain time (usually every month) to be in the closed power protection state. Press the test button to check the leakage protection performance is normal and reliable.

七、 Notice

1, Leakage protection circuit breaker can not provide protection under the electric shock situation that the human body contact with the phase line and the neutral line at the same time, users should pay attention to safety.
2, Do not use the method of phase-to-ground short-circuit to test leakage circuit breakers, to avoid affecting the life of leakage circuit breaker.

Keywords: DZL18,leakage protection

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