What is difference between MCB and MCCB?

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The main difference between the two is their capacity, with the MCB rated under 100 amps with an interrupting rating of under 18,000 amps. Consequently, their trip characteristics may not be adjusted since they basically cater to low circuits.

On the other hand, an MCCB comes with an adjustable trip characteristic for the higher models. Usually, this type of circuit breaker would provide amps as high as 2,500 or as low as 10, depending on what is necessary. Their interrupting rating ranges from around 10,000 amps to 200,000 amps.

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