Quiet contactors needed for some 20KW fan heaters

[UKMeterman]

Hi,
I am looking for some quiet contactors to control a pair of 3 phase 20KW fan heaters in an art gallery. Are there any favourite suppliers?

 

[MJPD29]

Don't fall for hagers 'silent contactors'. Seen someone fit them and they are exactly the same as normal one. Turns out the silent is the 'hum' that most new contactors don't produce anyway.

 

[snowhead]

Solid state would be the only ones guaranteed to be quiet.

 

[UKMeterman]

Solid state would be the only ones guaranteed to be quiet.

Hi,
Very true, it may be a case of moving the contactors to the plant room and labliing the local isolation with warning remote control in use.

 

[westward10]

Why would you need to label the local isolation.

 

[davesparks]

Why would you need to label the local isolation.

Because everything has to be decorated with stickers these days to make it look pretty!

Even the NICEIC womble who came to visit last year wanted me to start putting 'danger 400V' stickers at regular intervals on the lid of trunking in case someone didn't realise there were cables in there

 

[MJPD29]

Where do the stickers stop? The 2 colours one is a joke, if you don't know why they are those colours close the lid and pi$$ off. There is vert rarely a need for 400v stickers either yet I see them plastered on isolators and boards all over the place

 

[buzzlightyear]

Where do the stickers stop? The 2 colours one is a joke, if you don't know why they are those colours close the lid and pi$$ off. There is vert rarely a need for 400v stickers either yet I see them plastered on isolators and boards all over

the idea is to put them on just in case a blind man with tester dont see them .

 

[Mike Johnson]

Guilty as charged, I have put L1, L2 & L3 stickers on 240volt socket outlets where distributing single phase from a three phase board especially when you only have a 12Kv supply and the tumble dryer and washing machine are side by side.

 

[James]

3RF2430-1AC45 | Siemens Solid State Relay, 30 A Load, DIN Rail Mount, 600 V Load, 30 V dc Control | RS

uk.rs-online.com

I would be looking at something like this.
bear in mind that when solid state contactors fail, they normally fail in the “closed” state.
it may be necessary to back it up with a normal contactor on an over temperature stat to prevent the element from overheating if the solid state fails.

 

[mainline]

3RF2430-1AC45 | Siemens Solid State Relay, 30 A Load, DIN Rail Mount, 600 V Load, 30 V dc Control | RS

uk.rs-online.com

I would be looking at something like this.
bear in mind that when solid state contactors fail, they normally fail in the “closed” state.
it may be necessary to back it up with a normal contactor on an over temperature stat to prevent the element from overheating if the solid state fails.

Maybe also worth mentioning that solid state devices shouldn't be used for isolation.

 

[marconi]

https://new.abb.com/low-voltage/products/motor-protection/installation-contactors

 

[timhoward]

Where do the stickers stop? The 2 colours one...

..got dropped in amendment 2.

 

[MJPD29]

..got dropped in amendment 2.

Shows how much I know! About time

 

[Mike Johnson]

Have to admit I read the heading as "Quiet Contractors" and immediately though there is no such thing.

 

[ipf]

Guilty as charged, I have put L1, L2 & L3 stickers on 240volt socket outlets where distributing single phase from a three phase board especially when you only have a 12Kv supply and the tumble dryer and washing machine are side by side.

Nowt wrong with that for circuit tracing.....should be 1L1, 1L2, 1L3 though, for the circuit involved.

 

[Mike Johnson]

This was in a domestic environment and 1L1 etc would not mean anything to a French electrician or domestic user, the 1 at the front is superfluous with only one three phase supply into the property.

 

[westward10]

This was in a domestic environment and 1L1 etc would not mean anything to a French electrician or domestic user.

Well this isn't in France.

 

[Mike Johnson]

But this situation was and I was commenting on the sensible need for labelling in some situations if this was a three phase supply being distributed as single phase in a UK property.

 

[ipf]

This was in a domestic environment and 1L1 etc would not mean anything to a French electrician or domestic user, the 1 at the front is superfluous with only one three phase supply into the property.

Bleedin' mind readers now, are we?

We talk about 3 phase supplies here and usually it infers a commercial or industrial situation.

Maybe, I should have read a bit more into it, with such a small supply, although the comment was about general UK installations rather than a frog house.