User Documentation

Weidmüller Interface GmbH Co. KG; Klingenbergstraße 16, 32758 Detmold-Germany
T4 (120°C) T5 (100 °C) T6 (85 °C)
Cartrige fuse-link
4 W/ 6,3A 61 36 21
4 W/ 6,3A 61 36 21
Cartrige fuse-link
2,5 W/ 6,3A 48 23 8
2,5 W/ 6,3A 48 23 8
WMF 2.5 FU PE SW
WMF 2.5 FU SW
max. ambient temperature (°C)
WMF 2.5 FU SW
Mounting instructions:
The WMF 2.5 FU terminal blocks 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/EN60079-15. 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.
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.
The fuse holder shall be fully closed all times. Do not remove or replace the fuse when energized.
This document should be read carefully before starting installation. Respect the information stated on the
certification label of the terminal, e.g. Type/s of protection, gas group and temperature class. The installation of
these terminals should only be carried out by authorized and qualified personnel whose training has included
instruction on the various types of protection and installation practices, the relevant rules and regulations, and
on the general principles of area classification.
The fuse link shall not be replaced in the presence of a hazardous area and the associated enclosure
shall be marked "Switch off supply and discharge any stored energy safely before removing fuse(s)".
The "stored energy" statement may be replaced by a statement declaring a de-energizing time before opening.
Table 2:
The fuse terminal is safe under the following conditions:
- Fuse terminal blocks WMF 2,5 FU shall not be mounted side by side. They shall be separated by a feed
through terminal block WMF 2,5.
- Use only fuse links according to the Table 1.
- The temperature class must be verified in the final customers specific application.
- T4 based on 120 °C of the insulating material and 85 °C for the fuse carrier.
WMF 2.5 FU PE SW
Compound arrangement:
Temperature class:
max. ambient temperature (°C)
The informativ temperatures of Table 2 were determined with a nominal current of 100 % according to the IEC
90647-7-3.
Separate arrangement:
CONDITIONS FOR SAFE USE:
The fuse terminal blocks maybe used only for short circuit protecting applications based on the operational
self heating at nominal current in combination with the specified fuse links at ambient temperatures according
to the following table:
Version: WMF FU 4986622 Index: 01 Date: 06.2016
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