3 Phase Changeover switch.

Need a 200A - 3 phase changeover switch for a project in work but can't find one on the web anywhere.
Can anyone help?

Situation is this,
Test panel comprising 3 phase - 170A test circuit,
3 phase - 15A test circuit,
440VDC - 170A test circuit,
440VDC - 15A test circuit,
Single phase - 240v - 15A test circuit.

We now have a 270A 3 phase inverter which is currently wired into the 3 phase - 170A contactor purely for testing the inverter at the moment. However, when it has passed its test/inspection the plan is to feed it from the main test panel thereby incorporating all the e/s switches and safety lockouts. From a safety point I have stipulated that the inverter must not be capable of being energised if the main panel is being used to test a motor and vice versa. So I am looking for a changeover/isolator switch to prevent this happening. The type I have in mind is a 3 position switch with the central position being off and the upper and lower positions controlling the test panel and inverter respectively.
Do you understand what I am trying to say?
If anyone could point me in the right direction or offer any advice it would be greatly appreciated.
Thanks.

A switch of that size is going to be HUGE, not to mention very expensive! (assuming such a beast exists)

What about using contactors with either mechanical or electrical interlocks?

The inverter for a VSD?

Thanks for the replies RF & Spark.

Would prefer contactors with mechanical interlocks than electrical purely from the point they are less likely to fail than an electrical one. I did think of an isolator between the feed from the panel to the inverter but decided not to go down this route in case some lazy so&so 'forgot' to use it and had both units energised. Any ideas?

Spark, by VSD do you mean Variable speed drive?
If so then yes, this is a future possibility though at the moment we are expecting a few large motors for overhaul and whilst the FLC is likely to be quite high the light load/no load tests we do will have much lower currents but the starting current will be high unless we use an inverter.

Once again, thanks for the replies lads.

Klockner Moellers 'T' range go to a maximum of 315A

clicky

I think you need to approach one of the big electrical suppliers. In Sizewell we dealt with Newi & Ayre and in concrete factory with Lockwell lectrics both gave good service when we needed the special.

Yes - you will need specialist manufacturer information as you are looking to switch a 170A DC load. Will the changeover switch/contactor arrangement be switching on-load?

Sorry guys, I may not have made myself clear.
We want the changeover switch to act as an isolator.
In the centre position it will isolate both the test panel and the inverter.
Switch it to one position and it energises the test panel, switch it through the central position thereby isolating the test panel and continue to the other position where it will energise the inverter.
No switching is to take place while under load.
Does that make more sense?
Thanks for the replies so far.

Paper Spark said:

Klockner Moellers 'T' range go to a maximum of 315A

clicky

Click to expand...

Conny - Have a look at the table on page 7. 315amp change over switch T8

Pens,
thank you, that should do the trick nicely.
Will show my boss and hopefully he will stick his hand in his pocket.
To be fair he is usually ok when it comes to needing something.
Once again, thanks.