This series of earth leakage circuit breakers are suitable for 50Hz, rated voltage single-pole two-wire, two-pole 230v, three-pole, four-pole 400V, rated current from 63A to 100A line, when the body electric shock or grid leakage current exceeds the specified value, the residual current The action circuit breaker can quickly cut off the fault power in a very short period of time to protect the safety of the human body and the electrical equipment. At the same time, it can protect the overload or short circuit of the line motor. It can also be used as the infrequent switching of the circuit and the frequent starting of the motor. use.
二、model and its meaning
1. The number of poles:
Single-stage two-wire (1P+N, two-pole (2P), three-pole (3P), three-pole four-wire (3P+N)
2. Short-circuit tripping characteristics: 10In ± 20%;
四、use of environmental conditions
1. The ambient air temperature -5 °C ~ +40 °C, the average value of 24h does not exceed 35 °C;
2. Altitude: The elevation of the installation site does not exceed 2000m.
3. Atmospheric conditions
The relative humidity of the air at the installation site does not exceed 50% at the maximum temperature of 40°C. Higher relative humidity may be allowed at lower temperatures, and the average temperature of the wettest month does not exceed +25°C. Humidity does not exceed 90%, and take into account condensation on the surface of the product due to temperature changes;
4. Installation category: Level III,
5. Pollution level: 3;
6. Installation type: Use TH35-7.5 steel rail mounting;
7. Installation conditions:
The external magnetic field of the installation site shall not exceed 5 times of the geomagnetic field. The residual current operated circuit breaker shall generally be installed vertically, and the handle upwards shall be connected to the power supply position;
There should be no significant impact and vibration at the installation site, and no corrosive or explosive gases should be present.
五、Main structure and working principle
The residual current operated circuit breaker is assembled from a DL5-100 high breaking circuit breaker and an earth leakage release. The DL5-100 miniature circuit breaker is mainly composed of an insulating housing, an operating mechanism, a static and dynamic contact, a time delay, and an instantaneous release. The arc chamber is composed of; leakage release is mainly composed of zero-sequence transformer, electronic identification control circuit, release push rod, test button, etc.; small circuit breaker and leakage release linkage through push rod;
2. Working principle:
When the handle plate of the leakage circuit breaker is turned to the ON position, the movable contact is moved to the static contact by the mechanical mechanism and reliably contacts with the static contact. When the circuit is overloaded, the overload current makes the hot bimetal element. Bending and pushing the lever causes the locking mechanism to reset, and the moving contact quickly disengages the static contact to realize the function of breaking the circuit; when the circuit is short-circuited, the short-circuit current causes the instantaneous release to act, and the plunger pushes the lever to make the locking mechanism Reset to achieve breaking. When residual current or electric shock occurs on the line, the signal output by the zero-sequence current transformer triggers the conduction of the thyristor, causes the core of the leakage tripping device to move, and the push rod pushes the tripping of the circuit breaker, so that the leakage circuit breaker is in a very short time. Cut off the power supply to achieve leakage protection.