User Documentation

Weidmüller Interface GmbH Co. KG; Klingenbergstraße 16, 32758 Detmold-Germany
– Do not remove or replace the test disconnect switch (AAP 21 4 DT) when energized!
WARNING – Do not remove or replace the test fuse disconnect switch (AAP21 4 FS) when energized!
In combination with other terminal block series and sizes and if other accessories are used, the applicable creepage and
clearance distances shall be met.
Regarding the use of accessories the instructions of the manufacturer must be followed.
The enclosure shall be constructed to block all sun and UV light from affecting the terminal blocks.
The terminal blocks shall be placed inside a suitable IECEx/ATEX certified IP54 enclosure for gas atmosphere. For dust
atmosphere the terminal blocks shall be mounted inside a suitable IECEx/ATEX certified ‘t’ enclosure (IEC/EN60079-31).
Schedule of Limitations:
The fuse terminal blocks shall be placed inside a suitable IECEx/ATEX certified IP54 enclosure for gas atmosphere. For
dust atmosphere the terminal blocks shall be mounted inside a suitable IECEx/ATEX certified
‘t’ enclosure (IEC/EN60079-31).
Essential Health and Safety Requirements:
Concerning ESRs this Schedule verifies compliance with the Annex III of ATEX directive only. By placing the product on
the market, the of this manufacturer declares compliance with other relevant Directives,
and all other safety related requirements including those of Annex II of this Directive.
If smaller conductor cross sections than the rated conductor cross sections are used, then the corresponding lower
current shall be stated in the Certificate of the complete apparatus.
Manually cut cross connections and cross connections with blank ends (ZQV´s ≥ 20 poles) shall not be used.
No other wire sizes or types than the ones specified in instructions must be used. The terminal blocks must
either be mounted next to another block of the same type and size or with an end plate.
When using the AAP21 4 FS terminal blocks with other terminal blocks series or sizes or accessories, the requirements
for clearance and creepages distances according to table 1 of IEC/EN 60079-15 has to be
observed. Regarding the use of covers, cross-connectors and end brackets the instructions of the manufacturer must be
followed.
For cross connection accessories current rating, resistance across the terminal please refer to the table under “Technical
data” above.
Version: AAP21 4 FS;12072843 ; Index: 00; Date: 10.2017
4