Solid State relay

[bhm1712]

please dont get me started on volt-free contacts!

I believe there was a heated discussion on here some years ago about that! i have strong thoughts!

 

[JohnW2]

please dont get me started on volt-free contacts! I believe there was a heated discussion on here some years ago about that! i have strong thoughts!

Agreed!! There was actually a discussion here quite recently and I, too, have some quite strong thoughts (which some others didn't seem to share!).

Kind Regards, John

 

[r.bartlett]

fitted the relay and heat sink and it didn't work.. looking at the unit can you confirm it is the right swap. The control voltage is 24vac

Untitled

• r.bartlett
• 6 Dec 2012
• 1

 

[wcavanagh]

That SSR needs min 90V ac to switch. So will not work with 24 V ac

 

[bhm1712]

looking at RS theres nothing else which has a control voltage of 230 with a load current of 50A.

Do you know the actual load on the SSR? what power are the heaters?

I wrongly assumed we were looking for a control voltage of 230v because of how the first post was written:

I have to replace a solid state relay which is woking one phase of a 3 phase heater bank (the other SSR is ok)

No mention of 24 volt control here. However its also my fault for not asking..

Very sorry.

 

[bhm1712]

In this situation both the SSR i suggested - the one you have, and the one Iggifier suggested will not work as i think we were both thinking that you wanted 230v control.

Now its get more tricky as there are not many on RS that will suit a 24Vac control voltage with that load.

Looking on RS now and there is infact only one :

http://uk.rs-online.com/web/p/solid-state-relays/5356184/

however it is out of stock until January

Do you need 50A load? what power are the heaters exactly???

 

[r.bartlett]

looking at RS theres nothing else which has a control voltage of 230 with a load current of 50A.

Do you know the actual load on the SSR? what power are the heaters?

I wrongly assumed we were looking for a control voltage of 230v because of how the first post was written:

I have to replace a solid state relay which is woking one phase of a 3 phase heater bank (the other SSR is ok)

No mention of 24 volt control here. However its also my fault for not asking..

Very sorry.

I posted a copy of the spec so I am even more confused now?

It is a 30kw heater bank wired in star. One phase is DOL the remaining two are via 2 SSR's.

I now see the original CG is rated at 24v dc yet the manual states supply voltage 24ac??

 

[r.bartlett]

In this situation both the SSR i suggested - the one you have, and the one Iggifier suggested will not work as i think we were both thinking that you wanted 230v control.

Now its get more tricky as there are not many on RS that will suit a 24Vac control voltage with that load.

Looking on RS now and there is infact only one :

http://uk.rs-online.com/web/p/solid-state-relays/5356184/

however it is out of stock until January

Do you need 50A load? what power are the heaters exactly???

CG are rubbish -everything is on back order till mid jan and no one keeps any stock

 

[wcavanagh]

Try Farnell

http://uk.farnell.com/crydom/cwa2450e/ssr-ip20-280vac-50a-18-36vac-zc/dp/1936447

 

[r.bartlett]

http://www.ebay.co.uk/itm/OPTO-22-2...al_Components_Supplies_ET&hash=item4abe4594f7



http://www.ebay.co.uk/itm/Crydom-D2...al_Components_Supplies_ET&hash=item2a261f7542

 

[r.bartlett]

Try Farnell

http://uk.farnell.com/crydom/cwa2450e/ssr-ip20-280vac-50a-18-36vac-zc/dp/1936447[/QUOTE]

sold!

 

[bhm1712]

Chaps

I have to replace a solid state relay which is woking one phase of a 3 phase heater bank (the other SSR is ok)

The unit is a CG model number CARLO GAVAZZI - RN1A48A50 - SSR, 50A

the details of it are as per pic. My problem is they are on short stock so I wonder if there is anyother one which I could get from RS which would do?

Untitled

• r.bartlett
• 2 Dec 2012
• 1

I assume another manufacturer will work but need expert advice before I go fit

TIA

Yes you did post the spec, but the spec shows the control voltage as being 24-230V +/- 15% which is where the long debate started from....

With you saying something about working off a single phase, i assumed that the control was also single phase 230/240 because you never told us it was 24v and i never asked - im really sorry for posting the wrong type up, if id have known it was 24V i would not have done that.

I am presuming that you have bought one off ebay now?

 

[r.bartlett]

No I bought the one from Farnell and it has been fitted and apparently is working correctly

Thanks to all.

 

[r.bartlett]

Chaps

I have to replace a solid state relay which is woking one phase of a 3 phase heater bank (the other SSR is ok)

The unit is a CG model number CARLO GAVAZZI - RN1A48A50 - SSR, 50A

the details of it are as per pic. My problem is they are on short stock so I wonder if there is anyother one which I could get from RS which would do?

Untitled

• r.bartlett
• 2 Dec 2012
• 1

I assume another manufacturer will work but need expert advice before I go fit

TIA

Yes you did post the spec, but the spec shows the control voltage as being 24-230V +/- 15% which is where the long debate started from....

With you saying something about working off a single phase, i assumed that the control was also single phase 230/240 because you never told us it was 24v and i never asked - im really sorry for posting the wrong type up, if id have known it was 24V i would not have done that.

I am presuming that you have bought one off ebay now?

This will help me in future. Can you show me where it states the control voltage is 24-230?

 

[Iggifer]

under where it says 'Type Selection, 1 Pole' underneath the word pole 'Control Voltage', third one down 24-230v ac/dc +/- 15%

and apologies for not clarifying the control voltage, bham is correct, I (wrongly) assumed 230vac