Introduction To Miniature Circuit Breakers

Miniature circuit breakers (MCBs), also known as micro circuit breakers, are suitable for overload and short-circuit protection of AC 50/60Hz lines with a rated voltage of 230/400V and a rated current up to 63A. They can also be used for infrequent switching of circuits under normal conditions. MCBs are mainly used in various locations including industrial, commercial, high-rise, and residential buildings. This product should comply with GB10963.1 and IEC60898 standards.

Generally, they include: company characteristic code, product code, design serial number, frame rating, rated current, tripping type, and number of poles, such as SSB65-C63/3P, HSB1-D63/2P, SBTB1/2-63, BYM-63/C63/4P (Type C 2P).