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Terminal blocks - no fusing down?

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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0 David Stone over 3 years ago

MJ, what do you mean by “safe”? Having decided that you can begin to understand what you are asking. Does safe consider the following, and if so why:
Downstream load characteristics
Likelihood of a particular fault
Corresponding fault current
Catoragise damage from the fault, and consequences
Lets assume the 35mm comes in from a 200A MCCB, and the outgoing small circuits are bits of control electronics as an example. Fill in the list and then you will see why it may not be necessary to “fuse down” everything. Please reply with your thoughts.
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0 David Stone over 3 years ago

MJ, what do you mean by “safe”? Having decided that you can begin to understand what you are asking. Does safe consider the following, and if so why:
Downstream load characteristics
Likelihood of a particular fault
Corresponding fault current
Catoragise damage from the fault, and consequences
Lets assume the 35mm comes in from a 200A MCCB, and the outgoing small circuits are bits of control electronics as an example. Fill in the list and then you will see why it may not be necessary to “fuse down” everything. Please reply with your thoughts.
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Terminal blocks - no fusing down?

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