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Terminal blocks - no fusing down?

M. Joshi

Whenever transitioning from a preceding supply cable protected by a higher current circuit breaker or fuse, I always fuse down before connecting the appropriate lower gauge wire.

 

What I wonder is then how such distribution blocks like these Weidmüller AWPD 35 4X6/6X2.5 are safe:

 

336b015b6f6025bb0464050c14dff2fc-huge-weidmuller-awpd-35-4x6-6x2-5.png
35mm² to 2.5mm²
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    Smaller conductors do in general require a smaller size fuse. but exceptions exist, for example if the larger conductor is very over sized for voltage drop reasons.

    Or when over current protection is provided downstream. Example 35 mm cable on a 100 amp fuse, then several low current circuits in 2.5 mm cable on 16 amp fuses.

    If the 2.5mm cables are short then you do not need 35mm cable into the holders for 16 amp fuses.

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    Smaller conductors do in general require a smaller size fuse. but exceptions exist, for example if the larger conductor is very over sized for voltage drop reasons.

    Or when over current protection is provided downstream. Example 35 mm cable on a 100 amp fuse, then several low current circuits in 2.5 mm cable on 16 amp fuses.

    If the 2.5mm cables are short then you do not need 35mm cable into the holders for 16 amp fuses.

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