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Choose different products according to different working voltage and current
In terms of rated current, in principle, the rated current 630A requires the use of a frame circuit breaker, and the molded case circuit breaker is generally 630A (some new products can reach 1600A). It can be seen that the rated current of the frame circuit breaker is much larger, generally 630A-6300A. In addition, the frame breaker is higher than the molded case circuit breaker in terms of segmentation capability.
In practical applications, circuits with a particularly high loop or segmentation capability above 800A or circuits requiring more functions should use frame circuit breakers, circuits below 630A, and generally use molded case circuit breakers.
All parts of the frame circuit breaker are housed in an insulated metal frame, which is often open type, and can be equipped with a variety of accessories. It is convenient to replace the contacts and components, and is used in the main switch of the power supply end. The overcurrent release has electromagnetic, electronic and intelligent trip units. The circuit breaker has four sections of protection for long delay, short delay, instantaneous and ground faults. Each protection setting value is adjusted within a certain range according to its frame level.
The current can be automatically cut off after the current exceeds the trip setting. Molded case circuit breakers usually contain a thermal magnetic trip unit, while large molded case circuit breakers are equipped with solid state trip sensors. The trip unit is divided into: thermal magnetic trip and electronic trip unit.
Also known as a device-type circuit breaker, the grounding wire terminal outer contacts, the arc extinguishing chamber, the trip unit and the operating mechanism are all housed in a plastic housing. Auxiliary contacts, undervoltage release and shunt release are modular, and the structure is very compact. Generally, maintenance is not considered, and it is suitable for the protection switch of the branch.
It is mostly manual, and the large capacity can be selected for electric splitting. Due to the application of electronic overcurrent release, it can be divided into Class A and Class B. Class B has good three-stage protection characteristics, but due to price factors, the market for Class A products using thermal magnetic trip units The occupancy rate is higher.
Molded case circuit breaker is an overcurrent release device with electromagnetic and electronic type. Generally, the electromagnetic molded case circuit breaker is a non-selective circuit breaker. There are only two long-delay and instantaneous protection modes. The electronic molded case is open. The device has four protection functions: long delay, short delay, instantaneous and ground fault. Some of the new electronic molded case circuit breakers also feature a regioselective chain function.