MCBs for residential

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dealova

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I have read Merlin-Gerin catalogue, their recommendation MCBs for residential use are :

In UK : single-pole, 6kA (60898), B Curve

In Australia : single-pole, 4.5kA (60898), C Curve

In Singapore : dual-poles, 6kA (60898), C Curve

Despite the different setup for different country, does anyone know what's the advantages of using dual-poles (Neutral Separate), 6kA and B tripping curve ? (i.e. over the single-pole, 4.5kA, C Curve).

Shouldn't RCCBs works well only on dual-poles (N separate) ?

Cheers.

 
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