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Please advice if we can make mechanical interlock by cable for 3 sources (Transformer + Generaor-1 + Generator-2) for NS630b MCCBs and only one of them will be ON at each time.

Kindly be informed that the mechanical interlocking by cables between 3 devices is possible only for NW only,not NS breaker,( as per source changeover catalog ref.LVPED211022EN page A-11)

Consequently,in order to have a mechanical interlock by cables for 3 devices associated with ATS function,you will be obliged to change the NS breakers to NW.

In this case,the interlock by cable for 3 Masterpact NWs 1 out of 3 can be done in two ways as given below

a) 3 sources, only 1 device closed, fixed or drawout devices >> ordering code 48610 >> Instruction sheet 51156126AA-03.pdf

b) 2 normal, 1 replacement source, fixed or drawout devices >> 48608 >> 51156124AA-03.pdf

Please find attached the instruction sheets in each case for more details about the references used and the installation steps.

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