Looking for 4-way 250v rotary switch

[oldcelt]

I was thinking of a photo of the broken switch and the plastic mounting assembly.

Well, the switch isn't broken as I said earlier. It's the plastic mechanism.

Much as I appreciate your helfulness, I'd have to unmount it and take it apart again to do that. Last resort, I think, if I can't find an alternative solution.

To be honest, I don't think it's repairable since the operating slide is moulded into the fascia. The whole fascia would need changing and that puts the cost out of court - getting close to a new hood price!

 

[stillp]

A switch like the one you posted a photo of would cost more than a cheap cooker hood. Try freecycle - join your local group, ask if anyone is throwing out their cooker hood. I often see complete kitchens on there.

 

[bernardgreen]

It might be possible to create a new mechanism using a casting resin. Using the bits of the broken one to make a mould. A lot of work but can be worthwhile.

Th company I used about 20 years ago no longer trades but this

http://www.ecfibreglasssupplies.co.uk/c-116-polyester-casting-resins.aspx

company appears to supply the resin and the moulding materials.

 

[ban-all-sheds]

Or take a multicore cable(s) to a position on the wall and use normal switches for the fan, lights etc.

 

[oldcelt]

A switch like the one you posted a photo of would cost more than a cheap cooker hood. Try freecycle - join your local group, ask if anyone is throwing out their cooker hood. I often see complete kitchens on there.

That switch is offered at £6.28 delivered!

 

[oldcelt]

It might be possible to create a new mechanism using a casting resin. Using the bits of the broken one to make a mould. A lot of work but can be worthwhile.

Th company I used about 20 years ago no longer trades but this

http://www.ecfibreglasssupplies.co.uk/c-116-polyester-casting-resins.aspx

company appears to supply the resin and the moulding materials.

Thanks, but not possible due to fragmentation of the important bits.

 

[oldcelt]

Or take a multicore cable(s) to a position on the wall and use normal switches for the fan, lights etc.

"Normal switches"? However you do it you still need a 2 pole, 4 position, BBM switch! May as well mount it on the canopy if you can find a suitable one

 

[OwainDIYer]

The hood has been reassembled with the speed set at medium.

Is it possible to leave it at that and use an external fan speed controller?

 

[ban-all-sheds]

"Normal switches"? However you do it you still need a 2 pole, 4 position, BBM switch!

No you don't.

 

[oldcelt]

"Normal switches"? However you do it you still need a 2 pole, 4 position, BBM switch!

No you don't.

Explain why please?

 

[ban-all-sheds]

How is the switch wired? What does it do? (i.e. what connections does it make?)

 

[oldcelt]

How is the switch wired? What does it do? (i.e. what connections does it make?)

It has Off and 3 x 2-pole connections which control the speed of the fan.

 

[ban-all-sheds]

But what connections are made and broken at each of the 3 positions?

 

[oldcelt]

But what connections are made and broken at each of the 3 positions?

Well, at the first position the fan is off.
2nd position: the contacts connect to the low speed coil of the fan motor.
3rd position: the low speed contacts are broken and the 3rd contacts connect to the medium speed coil of the fan motor.
4th position: the medium speed contacts are broken and the 4th contacts connect to the high speed coil of the fan motor.

 

[ban-all-sheds]

Are the different windings all completely separate, or are they commoned at one end?