The Chint Circuit Breaker is high quality!
The rated limiting breaking capacity (ka) kA) Icu AC50Hz 400V 70
The rated running breaking capacity (kA) Ics AC50Hz 400V 70
The minimum value of the rated residual switching-on and switching-off capacity I△m is 25%Icu. Seventeen point five
Use category a.
Total life expectancy with load and no load 2000/8000/10000
Tripper type thermomagnetic type
The residual operating current (adjustable in the fourth gear) I △ n (a) x2: 0.1/0.3/0.5/1; X4：0.2/0.5/1/2
Breaking time (adjustable in third gear) Total breaking time (s) T1: 0.3/0.5/1
Weight (kg) 3P/4P 9.5/11.5
NM8 or NM8S plastic casing circuit breakers are NM8L and NM8SL residual current operated circuit breakers
after being assembled with residual current protection modules conveniently. NM8L and NM8SL series residual
current operated circuit breakers are mainly used in circuits with AC 50Hz, rated voltage up to 400V and
rated current up to 630A A.. Its main function is to provide indirect contact protection for fatal personal
electric shock, and at the same time, it can also be used to prevent electrical fire caused by ground fault
current. It can be used to protect the overload, short circuit and undervoltage of the line, and can also be
used for infrequent switching of the line.
NM8L: Thermomagnetic Residual Current Action Circuit Breaker
NM8SL: Intelligent Residual Current Action Circuit Breaker
Shell level 100A 250A 630A
The rated current (a) is 16, 20, 25, 32, 4050, 63, 80, 100, 125, 160, 180, 200, 225, 250, 315, 350, 400, 500, 630
Note: the maximum value of thermomagnetic residual current operated circuit breaker is 500A A.
3 means 3 poles
4 means 4 poles
4A indicates that the N pole is not equipped with an overcurrent release element, and the N pole is always on;
4B indicates that the N-pole is not equipped with an overcurrent release element, and the N-pole and the other
three poles are combined and divided together (the N-pole is combined first and then divided)
4C indicates that the N pole is equipped with an overcurrent trip element, and the N pole is closed and divided
together with the other three poles (the N pole is closed first and then divided), and the operating current is 1.0In；;
4D indicates that the N pole is equipped with an overcurrent tripping element, and the N pole is always on, and the
operating current is 1.0In；;
M: No code for motor protection: power distribution protection
Normal working conditions and installation conditions
The altitude of the product installation site is 2000m and below;
The external magnetic field of the installation site of residual current operated circuit breaker shall not
exceed 5 times of the earth magnetic field in any direction;
The action value of the intelligent release is not affected by temperature fluctuation. However, the maximum
allowable current of residual current operated circuit breaker is still the same as that of circuit breaker
Environmental temperature.
Damp-heat: the relative humidity of the atmosphere should not exceed 50% when the ambient air temperature is
+40℃, and it can be higher at lower temperature. The monthly average maximum relative humidity in the wettest month is
90%, at the same time. The monthly average minimum humidity in this month is +25℃, and the condensation on the
product surface due to temperature change is considered.
Pollution level: the pollution level is level 3
Characteristics
Using splicing modular design, users can install and maintain themselves without affecting the characteristics
of circuit breakers;
With power indication;
The residual action current and the breaking time of the residual current can be adjusted, which is convenient
for users to choose;
With residual current action indication and reset button, users can quickly judge the action reason of residual
current action circuit breaker.
In addition, the residual current operated circuit breaker cannot be closed without confirming and eliminating
the leakage fault (the reset button is not pressed);
The residual current operated circuit breaker equipped with auxiliary switch can remotely indicate the tripping
of the circuit breaker in case of leakage fault;
High breaking ability and no arcing;
With isolation function and reliable contact indication
Isolation position is in "0" (off) position;
Only when the contact is fully opened can the operating handle indicate the "0" (OFF) position;
Padlocks can only be installed when the contacts are opened;
Rotating the handle will not change the reliability of contact indication;
The isolation function shall ensure the mechanical reliability indicated by the contact, no residual current,
and the terminal on the power supply side can withstand high impact voltage;
Isolation function