Answer: Circuit breaker products can be divided into: miniature circuit breakers, leakage circuit breakers, molded case circuit breakers, air circuit breakers and so on.
The rated current of the miniature circuit breaker is: 1A, 2A, 3A, 4A, 6A, 10A, 13A, 15A, 16A, 20A, 25A, 30A, 32A, 40A, 50A, 60Am, 63A, 80A, 100A, 125A, etc., according to Different national standards require the use of suitable current products. The number of poles can be selected as single-pole, two-pole, three-pole, or four-pole. The miniature circuit breakers mainly protect against overload and circuit breaker failures.
The current rating of an earth leakage breaker is the same as that of a miniature circuit breaker and it needs to be used according to the standards of each country. The number of poles can be selected to be unipolar, two-pole, three-pole and four-pole. In addition to the functions of overload and short-circuit protection, the leakage circuit breaker also has leakage protection function, which can detect the residual current.
The rated current of molded case circuit breakers, including all currents of miniature circuit breakers, has increased by 160A, 200A, 225A, 250A, 300A, 315A, 350A, 400A, 500A, 600A, 630A, 800A, 1000A, 1250A and so on. The number of poles can be selected from unipolar, bipolar, tripolar, and quadrupolar.
Air circuit breakers with a higher rated current can be used in circuits up to 6300 A to prevent circuit failures.