Might do better looking for a 300mA, there's a bit in fire protection for cattle barns that says we should install 300mA , so a little more common. It basically means the inverter you have is a leaky ****** that upsets standard 30mA RCDs. I've never understood how the hell DC could get to the AC side, plus most inverters have their own RCD detection built in.
IMHO, it's akin to saying you don't really need an RCD on the cct, but if you have to put one in to meet BS7671 requiements for eg a TT earth system, it needs to be insensitive.
https://www.proactivetechnicaltraining.co.uk/rcds-different-t
CEF do a 100mA unit Type A and a300mA for 3 phase
https://www.cef.co.uk/catalogue/products/4833584-100a-2-pole-100ma-type-a-rcd?gclid=Cj0KCQjw4ImEBhDFARIsAGOTMj810Q45_HJFvsOdu8o8p-i7nmtl83kZ708eLm-jllU0bVJmJc8mGu8aAp5WEALw_wcB&gclsrc=aw.ds
https://www.cef.co.uk/catalogue/products/4833618-100a-4-pole-300ma-type-a-rcd?gclid=Cj0KCQjw4ImEBhDFARIsAGOTMj9v0uEEKPUpjsaZPYULIM6av4HMa-EGcE-EE_qQ0GhVGrlF3QrVObQaAsETEALw_wcB&gclsrc=aw.ds
IMHO, it's akin to saying you don't really need an RCD on the cct, but if you have to put one in to meet BS7671 requiements for eg a TT earth system, it needs to be insensitive.
https://www.proactivetechnicaltraining.co.uk/rcds-different-t
CEF do a 100mA unit Type A and a300mA for 3 phase
https://www.cef.co.uk/catalogue/products/4833584-100a-2-pole-100ma-type-a-rcd?gclid=Cj0KCQjw4ImEBhDFARIsAGOTMj810Q45_HJFvsOdu8o8p-i7nmtl83kZ708eLm-jllU0bVJmJc8mGu8aAp5WEALw_wcB&gclsrc=aw.ds
https://www.cef.co.uk/catalogue/products/4833618-100a-4-pole-300ma-type-a-rcd?gclid=Cj0KCQjw4ImEBhDFARIsAGOTMj9v0uEEKPUpjsaZPYULIM6av4HMa-EGcE-EE_qQ0GhVGrlF3QrVObQaAsETEALw_wcB&gclsrc=aw.ds