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I should have added this... look at www.abb.com/substationautomation pick the tab 'transmission products' Once there, highlight COMBIFLEX. you will find the RXMVB relays on the COMBIFLEX home page.

suggest look at the RXMVB2 or 4 relays from ABB. they are possible equivalents. Depends a bit on the type of VAJ or MVAJ you have installed.

an adder to my previous msg acc to page 139 of PRAG ( where you can see the curves) the formula for the extremely inverse curve is t=80/(Isquare-1) where t is op time in sec and I is current (multiple of plug setting)

you can find them in the GEC PRAG book or in one of the later relays data sheets like MCGG or KCGG. check at the Alstom.com web site

Kazimierz, I have forwarded your request to ABB Switzerland pls continue this discussion with john.lang@ch.abb.com phone 41 58 585 5299 rgds

There is some amount of documentation available. these relays typically belong to an old GSX generator protection from ABB/BBC. Where are you located? send me a note & I will help you out rgds