My understanding is a GFCI is an American term for an RCD or an RCBO? My (UK) fridge is on a standard 30A breaker which itself comes off a single 80A/30mA RCD

My understanding is a GFCI is an American term for an RCD or an RCBO? My (UK) fridge is on a standard 30A breaker which itself comes off a single 80A/30mA RCD which was presumably part of the regs at one point. It's never tripped. All the RCBOs I've seen are 30mA too. (I have some sockets on a 10A breaker downstream of this which have tripped - the house needs a total rewire, total bunch of bodge jobs from the previous owner, including a 13A socket in the bathroom) Does a GFCI typically have a lower trip that 30mA?