How is the circuit breaker selected?
Release time:
2020-12-07
When we choose circuit breakers, we may not know how to choose because of the dazzling array of circuit breakers and various parameters. In fact, when we choose circuit breakers, although there are many specifications of circuit breakers waiting for you to choose, don't panic, because circuit breakers have long-delay, short-delay, instantaneous and ground fault four-stage protection, each protection setting value They are all adjusted within a certain range according to their frame level, so we must choose carefully. When choosing, you can make an independent judgment according to your specific use conditions after purchase and where we want to use it. After confirmation, you can choose the rated working voltage, rated current, set current of the release and other parameters, refer to the product sample. The provided protection characteristic curve selects the protection characteristic, and needs to check the short-circuit characteristic and sensitivity coefficient.
There are also many types of circuit breakers, such as: overcurrent releases include electromagnetic, electronic and intelligent releases. Among them, the more versatile circuit breaker is one of them - frame circuit breaker. What is a frame circuit breaker? The frame type circuit breaker is to install all the parts in an insulated metal frame, in which, a variety of accessories can also be installed, usually open type, it is more convenient to replace the contacts and components, and it is mostly used in the main switch at the power end. The frame circuit breaker also has a name, which is often called "universal circuit breaker". 50Hz, rated voltage of 380V, 660V, rated current of 200A-6300A are the most suitable AC voltage and current for frame circuit breakers.
Frame type circuit breakers are mainly used to distribute electric energy and protect lines and power equipment from overload, undervoltage, short circuit, single-phase grounding and other faults. The circuit breaker has a variety of intelligent protection functions and can achieve selective protection.
Under normal conditions, it can be used for infrequent switching of lines. The circuit breaker below 1250A can be used to protect the motor from overload and short circuit in the network of AC 50Hz voltage 380V. Frame type circuit breakers are also often used in the main switch of the 400V side of the transformer, the bus tie switch, the large-capacity feeder switch and the large-scale motor control switch.
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