To convert a 3 Pole Acti 9 MCB into an RCBO you will require a 3 Pole Add-on Vigi Module (Add-on Vigi module provides the earth leakage protection)
The 3 Pole Acti 9 MCB connects straight into the add-on Vigi module (becoming 6 poles wide). This combination provides you over current, short circuit and earth leakage protection.
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