Type A RCBO,s and the regs

Hi all,

Firstly I,m a trainee, and hoping you can make sense of my question.

I,m working on a project for college, designing circuits and using RCBO,s on my circuit design. I see 61009,s and Type B,C,D ect in tables in the OSG and regs, but no type A. What is the reason for this or have just missed something?

Thanks in advance

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