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The S0 class 10-16A circuit breaker is a compact thermal-magnetic circuit breaker used in industrial electrical systems to protect motors and lines from overloads and short circuits. The acronym S0 generally indicates the construction size of the device, i.e., the size/size of the housing, while 10-16A is the current regulation range. In many product sheets, this type is described precisely as S0 circuit breaker or motor/plant protection motor protector.