User Documentation

Weidmüller Interface GmbH Co. KG; Klingenbergstraße 16, 32758 Detmold-Germany
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.
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.
Manually cut cross connections and cross connections with blank ends (ZQV´s
≥ 20 poles)
shall not be used.
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.
WARNING – Do not remove or replace the test disconnect switch when energized!
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.
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.
The enclosure shall be constructed to block all sun and UV light from affecting the terminal blocks.
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.
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).
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.
For cross connection accessories current rating, resistance across the terminal please refer to the table
under “Technical data” above.
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.
Version: ADT 4 2C;12035111 ;Index: 02; Date: 01.2010
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