wiring a modular contactor 2 pole n/o

[sidekick]

Can anyone tell me how to wire a modular contactor.
I need to connect 1 - permanent live, 2 - Switched live and 3- the energising switch live.
I have the contactor with A1 , 1 AND 3 on top and A2 , 2 AND 4 on th bottom ??

 

[Deleted member 9648]

A1 and A2 are coil connections (energising...either Live/neutral 230v or phase/phase 400v).....if you are just switching a single pole use either terminals 1 and 2...or 3 and 4.

 

[sidekick]

A1 and A2 are coil connections (energising...either Live/neutral 230v or phase/phase 400v).....if you are just switching a single pole use either terminals 1 and 2...or 3 and 4.

So permanent live to 1 and Switched live from 2 with energising switch live from actuator to A1

 

[Deleted member 9648]

yep.....

 

[Dave_]

A1 Energising live
A2 Neutral (from supply side)
1 Permanent Live
3 Supply Neutral
2 Switch Live
4 Load Neutral

 

[sidekick]

A1 Energising live
A2 Neutral (from supply side)
1 Permanent Live
3 Supply Neutral
2 Switch Live
4 Load Neutral

I assume i'm ok just using the one pole for switching live from an actuator and no need to bring in a neutral.

 

[Deleted member 9648]

No probs with that if you only need the live switched.

 

[Dave_]

Indeed

 

[sidekick]

Thanks - You've all been a big help.
Can I now run the attached diagram for UFH and CH by you and see if you can spot any problems?

 

[Robo]

sorry to gat crash your post side kick.

For a 230v coil

Just to clarify. For the coil connections for say lighting i would tap off 1(perm live) to a photocell and then sw back to A1. A2 loop off supply neutral. I could also run an overide in parallel to the photcell.
I assume if need be i could have a seperate supply for control of the coil?? to save looping of perm 1 and 2
connection.

Could you explain the 3 thrase coil set up please?

 

[Dave_]

sorry to gat crash your post side kick.

For a 230v coil

Just to clarify. For the coil connections for say lighting i would tap off 1(perm live) to a photocell and then sw back to A1. A2 loop off supply neutral. I could also run an overide in parallel to the photcell.
I assume if need be i could have a seperate supply for control of the coil?? to save looping of perm 1 and 2
connection.

Could you explain the 3 thrase coil set up please?

Yes you can keep the coil seperate, by keeping it on its own circuit with just, say a 3A CB, thus ensuring the failure of a lighting circuit (if it fed the coil) would not affect another. This is more applicable in commercial/ industrial wiring, where you may have multiple banks of flourescent lighting.

On a 3 phase coil you need 400v to operate the coil.... therefore you need to use two phases, and not line & neutral

 

[Robo]

Yes you can keep the coil seperate, by keeping it on its own circuit with just, say a 3A CB, thus ensuring the failure of a lighting circuit (if it fed the coil) would not affect another. This is more applicable in commercial/ industrial wiring, where you may have multiple banks of flourescent lighting.

On a 3 phase coil you need 400v to operate the coil.... therefore you need to use two phases, and not line & neutral

Sorry for all the questions Dave. Regarding the SP contactor. If i had a 2 pole contactor(So 2 seperate circuits and switched lives or 4 pole for switching neutrals to. I could tap of one of the circuits to get feed for coil. If this circuit got a fault and tripped i would now not be able to switch second circuit. So if i have seperate supply that combats that. I think thats correct.

So if i had a 3 phase contactor with 3 phase coil. I need 400v from 2 of the phases. Ho would you suggest switching the coil. Some kind of 2 pole swithc or islator??

Thanks