donnib

@Gerrie thank you very much for your help, i will have to dig into Schneider products and see if i can find the the preassembled one in parts since i can't find it here online for example the LC1D50, i even tried some of the smaller ones since for one phase i only need 16A @ 230V

Thank you @Gerrie, Can you recommend a change-over contactor with both electrical and manual interlock for just one phase ?

I found this video so this may be what you are saying ? So i need to connect two contactors control signals to each other ? This is electrical interlock but is there a requirement of a mechanical interlock ?

True, problem is that i would violate the rule to balance my loads on the 3 phases not that they probably check that. Another question, this interlock feature. Does the contactor for example this https://www.aliexpress.com/item/32788838320.html?spm=a2g0o.productlist.0.0.781862eduKwEq3&algo_pvid=5f7eb79b-2000-4cec-82fe-11930755fe0a&algo_expid=5f7eb79b-2000-4cec-82fe-11930755fe0a-8&btsid=0bb0623116052573552506214ee90b&ws_ab_test=searchweb0_0,searchweb201602_,searchweb201603_ fullfill the interlock i mean is this 100% secure to use so both AC and and PV out are not mixed or is there something else required beyond this ? If you have link to what you think is required that would be nice to see. thx

I wasn't aware that a contactor wasn't a 100% guarantee that it was a isolation between the two. Is it because there is a risk when it switches that it can connect both at the same time ? What i meant is that my appliances are on different phases so they are balanced so i don't consume over just one phase but there is no appliances that ACTUALLY takes use of the 3 phases but now that i think of it all this transfer of all 3 phases is not a good idea since if i sell the house and people then install 3 phases things then there will problems in case they run on the inverter since they may require 400V which they won't get so that would be a no go solution. I guess what i could do is like you, just add few contactors that i can control either manually or from an app that so if i want in case of power loss i can move things over to the inverter. Do you see problems in that? Sorry if i am taking over your post, maybe i should move my discussion in a separate post ?

Hi @Gerrie, i found your post quite interesting. I was looking at these Tomzn contactors. I have a 3 phase home installation but a 1 phase inverter which i plan to install so it will be grid tied but in case power goes which happens very rare it would be nice to switch to inverter btw. inverter has a AC OUT which i could connect the contactor to and switch things so i have power while the power is lost BUT the problem is, all my appliances run on a 3phase system however i don't have any appliances REQUIRING 3 phase e.g using the 3 phases at the same time so i was thinking to get 4P Tomzn contactor and take all the phases and connect them to the same output from the inverter thru the contactor. What do you think ? I can't see why that would not work.