Question about non-automatic transfer switch

[Sayedahmed]

hi,
i want to design non-automatic transfer switch by 2 contactors and push buttons.
my question is do i need mechanical between the 2 contactors? or it is enough to work with NO-NC for both contactors.
please help me

 

[stef]

hi,
i want to design non-automatic transfer switch by 2 contactors and push buttons.
my question is do i need mechanical between the 2 contactors? or it is enough to work with NO-NC for both contactors.
please help me

Hi mate,

usually an electrical interlock is sufficient. I think an additional interlock is only required by cranes, FLTs etc.
Hope this will help.

 

[Sayedahmed]

thanks very much
more details:

I need this to work between generator and main , it is not manual with handle and also not ATS.
can i count on wiring the NO for the first contactor with NC for the second contactor and vice versa
so when the first is on the second is off and when the second is on the first is off.
i don't want the main power get into the generator

 

[danzor]

What are you trying to make? Some kinda changeover switch?

 

[Sayedahmed]

What are you trying to make? Some kinda changeover switch?

yes that what i am try to do

 

[johnboy6083]

i would personallyhave a mechanical interlock, as i have experienced contactors sticking to NO or NC before, and you would'nt want both supplies to energise together ect!

 

[davelerave]

i think its prob a requirement for changeover

 

[Steve1412]

I have always fiited mech and elec interlocks.....good practise

 

[johnstantine]

I would definitely go with electrical and mechanical interlock.