I have an EExe certified enclosure (a junction box). Can I stick two MCB's and few fused terminals in it without sacrificing the certification. In case a fuse blows, it happens within its sealed glass tube. In case an MCB drops on account of overload, the switching will take place within the MCB housing.

Regards
VK Aggarwal

 

No - one of the conditions of use for an Exe box is that it cannot contain any potentially sparking components (unless these are protected using another method - you can have for instance an Exd protected switch in an Exe enclosure).

A fuse may have an external temperature that is elevated even at rated current.