User Documentation

Weidmüller Interface GmbH Co. KG; Klingenbergstraße 16, 32758 Detmold-Germany
A thermal assessment for the classification into the temperature classes T6…..T1 shall be performed. No part of
terminal block must exceed 130 °C under any condition.
WARNING – Do not remove or replace the test disconnect switch (AAP21 4 DT) when energized!
Mounting instructions:
The disconnect terminals of the A-series are suitable for application in enclosures in atmospheres with flammable
gases or combustible dust. For use in flammable gases these enclosures must satisfy the requirements according
to IEC/EN60079-0 and IEC/EN60079-7. For use in combustible dust these enclosures must satisfy the
requirements according to IEC/EN60079-0 and IEC/EN60079-31.
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
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).
– Do not remove or replace the test fuse disconnect switch (AAP21 4 FS) when energized!
Schedule of Limitations:
The disconnect terminal blocks are suitable for use in enclosures in atmospheres with flammable gases or
combustible dust. For flammable gases these enclosures must satisfy the requirements according to
IEC/EN 60079-0 and 60079-7. For combustible dust these enclosures must satisfy the requirements according to
IEC/EN 60079-31.
Under normal operating conditions the temperature rise of the terminal blocks is max 40 K, measured with the
max permitted rated current. Due to the above mentioned the terminal blocks may be used in apparatus of
temperature classes T6…T1 as long as the terminal block ambient temperature range is not exceeded as shown
below. No part of terminal block must exceed 130 °C under any condition.
Manually cut cross connections and cross connections with blank ends (ZQV´s
≥ 20 poles) shall not
be used.
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.
When using the types of disconnect terminals especially with other terminal blocks series or sizes or accessories
the requirements for clearance and creepage distances of EN 60079-7 must be maintained. Regarding the use of
covers, cross-connectors and end brackets the instructions of the manufacturer must be followed.
If smaller cross sections than the rated cross section are used, the belonging lower current has to be laid down in
the IECEx/EC-Type Examination Certificate of the complete apparatus.
For cross connection accessories current rating, resistance across the terminal please refer to the table under
“Technical data” above.
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.
The terminal blocks may be used, based on the self-heating when used at the nominal current and at ambient
temperatures of - 60 °C to + 40 °C at the mounting position in electrical apparatus, e.g. junction and connection
boxes, for temperature class T6. when the terminal blocks are used in electrical apparatus of temperature classes
T1 up to T5, the highest temperature of the insulating material shall not exeed the max. value of the operating
temperature range.
Version: AAP21 4 DT;12072846 ; Index: 01; Date: 04.2018
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