I've got a 150a Crouse Hinds panel circa 1989 and need to install a 20a 240v GFCI breaker and am stumped as to what to install. I've looked at lists of classified breakers but it appears that there are no 240v GFCI breakers for this panel. Is that possible? I know that there are plenty of breakers which will fit but I'm looking for a legal one. Attached is a copy of the label.