Overview of circuit breakers
Release time：
2023-03-02 13:56
Source：
Circuit breaker is a switching device that can close, carry and open the current under normal circuit conditions and can close, carry and open the current under abnormal circuit conditions within a specified period of time. Circuit breakers are divided into high-voltage circuit breakers and low-voltage circuit breakers according to their scope of use. The division of high-voltage and low-voltage boundaries is rather vague, and those above 3kV are generally referred to as high-voltage appliances.
Circuit breakers can be used to distribute electrical energy, start asynchronous motors infrequently, protect power lines and motors, and automatically cut off the circuit when they are seriously overloaded or short-circuited and under-voltage faults, and their functions are equivalent to the combination of fuse-type switches and over-under thermal relays. And after breaking the fault current generally do not need to change the parts. Has been widely used.
Electricity generation, transmission and use, power distribution is an extremely important link. Distribution system includes transformers and a variety of high-voltage electrical equipment, low-voltage circuit breakers are a kind of electrical appliances used in a large number of areas.
Other developments
Main characteristics of circuit breakers
The characteristics of the circuit breaker are mainly: rated voltage Ue; rated current In; overload protection (Ir or Irth) and short-circuit protection (Im) decoupling current adjustment range; rated short-circuit breaking current (industrial circuit breaker Icu; household circuit breaker Icn), etc.
The history of signal light development
In 1858, a mechanical wrench type signal in red and blue with coal-fired gas as the light source was installed in the main street of London, England to direct carriages to pass. In 1868, British mechanical engineer Naite installed the world's earliest gas traffic light in the square in front of the Palace of Westminster in London.
The scientific basis of the light color of the traffic signal
In the earliest days, there were only two colors, red and green, and later, after improvement, a yellow light was added. Red light means stop, yellow light means ready, and green light means pass. The reason why these three colors were adopted and used as traffic signals is also related to people's visual structure and psychological response.
In the intersection, four sides are hanging red, yellow, green, three color traffic signal, it is silent "traffic police". Red and green lights are the international unified traffic signals. Red light is the stop signal, green light is the signal to pass. Intersection, several directions to the car are gathered here, some want to go straight, some want to turn,
Specializes in electrics,such as traffic lights, traffic signal controllers ,MCB, MCCB, contactors, relays, switches, rotary switch,push buttons, indicators, distribution box,meter,timer switch etc.
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