Low-voltage circuit breaker function and structure
First, the function of the low-voltage circuit breaker
Low-voltage circuit breakers are also called automatic air switches, referred to as circuit breakers. It integrates control and multiple protection functions. When the line works normally, it turns on or breaks the circuit as a power switch. When the circuit experiences a short circuit, overload, or loss of voltage, it can automatically trip and cut off the fault circuit, thereby protecting the circuit. Lines and electrical equipment.
Second, the classification of low-voltage circuit breakers
According to the mode of operation: There are electric operation, energy storage operation and manual operation.
According to the structure: there are universal type and plastic shell type.
According to the use of categories: selective and non-selective.
According to the arc extinguishing medium: oil-immersed, vacuum-type and air-type.
According to the speed of action points: There are fast type and ordinary type.
According to the number of poles: There are unipolar, bipolar, tripolar and quadrupole and so on.
According to installation methods: There are plug-in, fixed and drawer type.
The most commonly used is the DZ series molded case low voltage circuit breaker.
Third, the structure of low-voltage circuit breakers
DZ5 series low-voltage circuit breakers consist of contact system, arc extinguishing device, operating mechanism, thermal release, electromagnetic release and insulation shell.
Fourth, the meaning of the symbol and model of the low-voltage circuit breaker
Fifth, the internal structure of low-voltage circuit breakers:
Six, circuit breaker electrical graphic symbols and text symbols are as follows:
Seven, the selection of low-voltage circuit breakers
1. The rated voltage and rated current of the low-voltage circuit breaker shall not be less than the normal working voltage of the line and the calculated load current.
2. The setting current of the thermal release shall be equal to the rated current of the controlled load.
3. The instantaneous tripping setting current of the electromagnetic release should be greater than the peak current that may occur during normal operation of the load. The circuit breaker used to control the motor, the instantaneous tripping setting current can be selected by the following formula: In the formula, K is the safety factor, taking 1.5~1.7; it is the starting current of the motor.
4. The rated voltage of the undervoltage release shall be equal to the rated voltage of the line.
5, the limit switch capacity of the circuit breaker shall not be less than the maximum short circuit current of the circuit.
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