User Documentation

Weidmüller Interface GmbH Co. KG; Klingenbergstraße 16, 32758 Detmold-Germany
When using the initiator/actuator terminal blocks of the A-series especially with other terminal blocks series
or sizes or accessories the requirements for clearance and creepage distances according to table 1 of EN
60079-7 must be observed. 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
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 manufacturer declares compliance with other relevant Directives, and all other
safety related requirements including those of Annex II of this Directive.
Note:
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.
Mounting instructions:
The initiator/actuator terminal blocks 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.
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.
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.
Schedule of Limitations:
The initiator/actuator terminal blocks of the A-series 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 EN 60079-0 and EN 60079-7. For combustible dust the enclosure must satisfy the requirements
according to EN 60079-0 and EN 60079-31.
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 certified IP54 enclosure in type of protection “e” for gas
atmosphere. For dust atmosphere the terminal blocks shall be mounted inside a suitable certified enclosure
Under normal operating conditions the temperature rise of the terminal blocks is maximum 40 K, measured
at the maximum 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. No part of terminal block must exceed 110 °C under any condition.
T6 (- 60°C ... +40 °C)
T5 (- 60°C … +55 °C)
T4 (- 60°C ... +70 °C)
For cross connection accessories current rating, resistance across the terminal please refer to the table
under “Technical data” above.
Version: AIO 23 2SI; 11103918 Index: 02 Date: 03.2019
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