The SD Series Molded Case Circuit Breaker is suitable for low-voltage power networks with AC 50Hz, rated insulation voltage 800V, rated operating voltage up to 690V, and rated current 16–800A. It is generally used for distribution protection and can also be used for motor protection. The distribution-protection type is used in power distribution networks to distribute electrical energy and provide overload and short-circuit protection for lines and power equipment. The motor-protection type is used in 400V power distribution networks for the start/stop control of squirrel-cage induction motors as well as overload and short-circuit protection.