User Documentation

Weidmüller Interface GmbH Co. KG; Klingenbergstraße 16, 32758 Detmold-Germany
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 WMF 2.5 DI 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.
WARNING – Do not remove or replace the fuse/test disconnect switch when energized!
Note:
The creepage and clearance distances were determined in the worst case.
(with closed or open clamping yoke)
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 WMF 2.5 DI terminal block is suitable for application in enclosures in atmospheres with flammable
gases and combustible dust. For use in flammable gases these enclosures must satisfy the requirements
according to IEC/EN60079-0 and IEC/EN60079-15. 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.
Schedule of Limitations:
The disconnect terminal block is suitable for use in enclosures in atmospheres with flammable gases and
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.
Version: WMF 2.5 DI 4756392 Index: 01 Date: 06.2015
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