I've just blown the dust off an old 60A Crabtree VOELCB whiich has been lying in my cellar for a decade or three. Its coil ('E' to 'F' terminals) measures as about 510Ω (DC measurement). Although the trip voltage is stated as 50V, it actually trips at between 30V and 35V.I've got an old ELCB in the back of the garage somewhere. If I remember tomorrow, I'll power it up and do a few tests on it.
Kind Regards, John.