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How many additional " OF "Auxilary contacts can be installed on NW Air circuit breaker ?

its accessable to installe up to 2 auxilary contacts as each OF reference contain 4 change over aux.contacts and the NW has already builtin 4 auxiliary contact so the maximum number of OF that will be additioned to the main Auxiliary contacts is 2OF each contain 4 so the equal number is 8 and the hole total number builtin + additional on NW Air circuit breaker is equal 12  Auxialry contacts
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