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Relay switching max voltage across contacts

Thought i would put this out there for any experience faced with this design issue.

TP Immersion heater 11KW, has built in contactor, coil voltage 400V
I want to bring in the immersion heater via control system and ideally not alter the immersion heater package.
The control system can operate a volt free contact which i could use to switch the 400V coil.
However, the control system manufacturer does not quote a max switching voltage, all its data is for 230V .
Now i know the current will be tiny but nethertheless there will be 400V across the relay contacts.
I can install another relay from RS that at least does quote a 450V max switching voltage but that would mean i have a control relay, switching a "special relay" that then brings in the immersion contactor.

Would you go with just the std relay and hope 400V will not harm it or would you put another relay in for comfort.
Yes i know the logical thing is to alter the coil voltage to 230V but that is not preferred ATM.

Any help...

Relay switching max voltage across contacts

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