User Documentation

Weidmüller Interface GmbH Co. KG; Klingenbergstraße 16, 32758 Detmold-Germany
Additional information:
The manufacturer shall inform the notified body concerning all modifications to the technical documentation
as described in the ATEX Directive 2014/34/EU.
The terminal can be used with either one or two wires into either side of the terminal. When two wires are
used they must be of the same type, and of equal sizes. 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.
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.
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
mam. value of the operating temperature range.
When using the types WTR 4 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 must be observed.
Regarding the use of covers, cross-connectors and end brackets the instructions of the manufacturer must
be followed.
For terminal jumper accessories current ratings and the resistances across the terminals please refer to
the table under “types & electrical rating” above. Details on creepage and clearance values and the
required torque values are in the respective “Notice to installers”.
Unused terminals shall be tightened.
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.
Schedule of Limitations:
The disconnect terminal block is 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 60079-15. For combustible dust these enclosures must satisfy the requirements
according to IEC/EN 60079-31.
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).
The enclosure shall be constructed to block all sun and UV light from affecting the terminal blocks.
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…T1as long as the terminal block ambient temperature range is not
exceeded as shown below. No part of terminal block must exceed 120 °C under any condition.
WARNING – Do not remove or replace the test disconnect switch when energized!
Manually cut cross connections and cross connections with blank ends (ZQV´s ≥ 20 poles)
shall not be used.
Version: WTR 4 4986667 Index: 00 Date: 06.2016
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