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Switch-Disconnectors have been certified in accordance to IEC 60947-3 (Switching and Controlling) while the normal ACB has been certified and tested in accordance with IEC 60947-2 (protection applications). Accordingly, each switchgear has a different application and have been tested against different standards. At the same time, although there is no mechanical differences in their mechanical mechanisms, there is a difference in the contacts materials of the devices. Accordingly, the performance of breaking is different between a switch-disconnector and a circuit breaker.
Hence, our advice would be to select the proper device in accordance to the application from the beginning.
Hence, our advice would be to select the proper device in accordance to the application from the beginning.