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4.4.2 - MNC-II - Sequence
• Dimension of main contact sequence
Remove the arc chutes
Close the breaker
Check the dimension “A” in picture. It must be:
1,2mm<A<2mm
Thickness gauge (present in maintenance kit) 1,2mm
➔
go
Thickness gauge (present in maintenance kit) 2mm
➔
NO go
At the end get again the breaker in open position with springs discharged
discharged
charged
discharged
discharged
discharged
charged
discharged
discharged
If dimension “A” is out of range
➔
it is necessary to perform procedure “PMP3005”*
*procedure “PMP3005” can be used only By BTicino service or certified/qualified service companies
A