240V-120V split system ground fault protection

[Wannes]

Dear All, I'm installing a main breaker on a 240V-120V split system (125A, 60Hz, 2P+N) provided by the power company. For safety reasons, this main breaker needs ground fault protection. My idea is to install a 3P breaker (LV430840) with Micrologic 6.2 (C1636E160) as a trip unit with ground fault protection. The 2 phases and neutral would run through this breaker. Is this allowed? Since standard GFCI breakers only go up to 60A, I don't see another option unless maybe using a separate neutral sensor? Thanks in advance for your expertise!

[S-W]

Hello @Wannes , thank you for your message, we'll come back to you with a reply soon.