Circuit breaker (English name: circuit-breaker, circuit breaker) refers to the ability to close, carry and break the current under normal loop conditions and can close and carry and break the current under abnormal loop conditions within a specified time. Switching device. Circuit breakers are divided into high-voltage circuit breakers and low-voltage circuit breakers according to their use range. The division of high and low voltage lines is relatively vague. Generally, 3kV or more is called high-voltage electrical equipment.
Circuit breakers can be used to distribute electrical energy, start asynchronous motors infrequently, protect power lines and motors, and automatically cut off circuits when they are severely overloaded or short-circuited or under-voltage faults. Their functions are equivalent to fuse switches. Combined with over-heat relays and the like. Moreover, it is generally not necessary to change parts after breaking the fault current. At present, it has been widely used.
Power generation is an extremely important part of the generation, transmission and use of electricity. The power distribution system includes transformers and various high and low voltage electrical equipment, and the low voltage circuit breaker is a kind of electrical appliance with a large amount of use.
In the power grid, the main role of the circuit breaker is twofold:
(1) Control role. That is, some power equipment or lines are put into or cut off according to the operation requirements.
(2) Protection. That is, when the power equipment or the line fails, the relay part and the automatic device act on the circuit breaker, and the fault part is quickly cut off from the power grid to ensure the normal operation of the non-faulty part of the power grid.
high pressure
1. Turn on and off the no-load and load current in the high-voltage circuit under normal conditions.
2. In the event of a system failure, it can cooperate with the protection device and the automatic device to quickly cut off the fault current and prevent the accident from expanding, thus ensuring the safe operation of the system.
In fact, the circuit breaker is a kind of switch. It differs from other common switches mainly in: 1. Applicable voltage level is high 2. Arc extinguishing medium and mode, there are vacuum, less oil, more oil and sulfur hexafluoride, etc. 3 Strong arc extinguishing ability and good effect.
Leakage protector as low voltage
The principle of this kind of circuit breaker is that when the fire wire and the ground wire are connected, it will play a protective role. It will be automatically disconnected. Generally, the human body is electrically disconnected when it is electrically shocked.
Circuit breakers are widely used in daily life, protection circuits in various electrical appliances, and electric shock protectors in household electrical circuits. Its function is: when a short circuit occurs in the circuit, the circuit breaker acts instantaneously, disconnects the power supply, and protects the circuit. If a person gets an electric shock, the circuit breaker acts instantaneously and disconnects the power supply, which can serve as a security guard. The quality of the circuit breaker is directly related to whether it can really play a security role. Therefore, the quality of the household circuit breaker is the key, must buy the production address, production date, quality assurance. At the same time, we must consult experts, according to your home's power load, buy a circuit breaker of how much current, too large and too small can not protect the appointment, and even find trouble for themselves.
The role of the load switch
Breaking and closing cooperation. It can replace the circuit breaker by turning on and off the load current under normal working conditions and working with the high-voltage fuse.
Alternative role. A combination of a load switch and a current limiting fuse can be used in place of a circuit breaker. That is, the load switch is responsible for breaking and closing the overload current less than a certain multiple, and the current limiting fuse is responsible for breaking the large overload current and the short circuit current.
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