1 Overview
The HUM8L Series Earth Leakage Circuit Breaker (hereinafter referred to as “circuit breaker”) is a new
product successfully developed by our company with international advanced technology in 1990s. This
product is characterized by perfect protection, reliable performance, high technical specification,
beautiful appearance and small size, which is an ideal product for upgrading old products.
Users must carefully read this instruction before installation, use and maintenance to ensure correct
use and avoid safety accidents.
2 Purpose and Scope of Application
This circuit breaker is suitable for the power system with AC 50 Hz, rated voltage of 400 V, and rated
current up to 630 A. It is used to distribute electric energy, protect the power system from overload,
short circuit and other faults, and control the infrequent operation of the motor.
The earth leakage (residual current) protection function of the circuit breaker is to provide indirect
contact protection for personal electric shock with fatal danger, and also to prevent electrical fire
caused by long-standing grounding fault current that cannot be detected by the overcurrent protection
device.
When the rated residual operating current is set to 30 mA (for the non-delay circuit breaker) and the
relevant protection device fails, the circuit breaker can also be used as a direct contact protection
device.
However, the circuit breaker cannot protect against the electric shock caused by the simultaneous contact
with two load conductors (two phase wires or any phase wire and neutral wire).
The rated value of the residual operating current of the circuit breaker as well as the operating time of
the HUM8LY earth leakage protection can be adjusted. Therefore, selective protection during earth
leakage can be realized in the power distribution system.
Classification by DC component: Type AC, ensuring the tripped CBR for the sinusoidal residual current
without DC component whether suddenly applied or slowly raised. Type AC, ensuring the tripped CBR
for the sinusoidal residual AC current with specified pulsating DC residual current whether suddenly
applied or slowly raised.
3 Standards Followed
The circuit breaker complies with the following standards:
IEC 60947-2, GB/T 14048.2
Low-voltage Switchgear and Controlgear — Part 2: Circuit-breakers
;
IEC 755, GB/Z 6829-2008
General Requirements for Residual Current Operated Protective Devices
.
4 Normal Working Conditions
4.1 The circuit breaker is suitable for the following working conditions:
4.1.1 The ambient air temperature shall not be higher than +40°C or lower than -5°C.
4.1.2 The altitude of the installation location shall not exceed 2,000 m.
4.1.3 The relative air humidity shall not exceed 50% at the maximum temperature of +40°C. A higher
relative humidity is allowed at a lower temperature. The average temperature of the wettest
month shall not 25°C, and the average maximum relative humidity of that month shall
not exceed 90%.
4.1.4 Contamination grade: Grade 3. There is no explosion danger and no gas or conductive dust
that corrodes metals or damages insulation in the surrounding air.
4.1.5 The installation category is Grade III.
4.1.6 The "1, 3, 5 and N1" terminals of the circuit breaker are connected to the power supply, and the
"2, 4, 6 and N2" terminals are connected to the load, which cannot be reversed.
4.1.7 The intensity of external field at the installation site shall not exceed 5 times of the geomagnetic
field.
4.1.8 The installation location shall be free of significant vibration and impact (with the acceleration
not more than 5 g).
4.1.9 The installation surface of the circuit breaker shall be vertical to the horizontal plane. The circuit
breaker is basically installed vertically, with the power supply terminal at the top and the load
terminal at the bottom, and can also be installed horizontally.
4.2 The three-phase load of the 3-pole circuit breaker must not have the neutral wire to avoid
malfunction.
4.3 Testing device
When the main circuit is energized, for non-delay circuit breakers, after the test button of the circuit
breaker is pressed, the circuit breaker shall trip within 0.1 s. For delay circuit breakers, the circuit
breaker will not trip until the test button is pressed and the set delay value must be maintained.
4.4 The earth leakage circuit breaker cannot be used in parallel with another one, nor can it be used
in parallel with other switchgears.
