that looks like an isolator to me
mem kxtn is a switchfuse used for fusing down to a smaller cable supply
mem Axtn is an isolator used to isolate motors etc for maintenance
why are fuses used compared to breakers?
click here for some food for thoughtThey are also used where the Short-Circuit Fault Current is too high for a breaker to safely handle. High SC Fault Currents are likely to be present in commercial and industrial environments, less likely in a typical 100amp single phase household supply.
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