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Thermal overload relay for
potentially explosive areas
TF140DU
General description
The extended risks when using these devices in
potentially explosive areas requires consistent
adherence to the following notes and standards:
• EN 60079-0 Explosive atmospheres – Part 0:
General requirements
• EN 60079-1 Explosive atmospheres – Part 1:
Equipment protection by flameproof
enclosure "d"
• EN 60079-7 Explosive atmospheres – Part 7:
Equipment protection by increased safety "e"
• EN 60079-14 Explosive atmospheres - Part 14:
Electrical installations design, selection
and erection
• EN 60079-17 Explosive atmospheres - Part 17:
Electrical installations inspection and
maintenance
• EN 60079-31 Explosive atmospheres – Part 31:
Equipment dust ignition protection by enclosure
• EN 50495 Safety devices required for the safe
functioning of equipment with respect to
explosion risks
The TF140DU thermal overload relay is authorized
under device group II, category (2) in the "G" area
(areas with potentially explosive gas, steam,
smoke or air mixtures) and additionally for
the "D" area (areas with combustible dust).
Warning! Hazardous voltage!
Safety instructions
• Mounting and installation may only be done
by trained technical personnel, according to
the recognized technical rules, regulations,
and relevant standards!
• Insufficiently tightened locking screws lead
to an inadmissible rise in temperature!
• Always observe the permitted ambient
conditions (see technical data and catalog).
• Devices with visible transport damage
must not be used.
BVS 13 ATEX E 102
II (2) G
II (2) D
The TF140DU thermal overload relay is not suit-
able for installation and/or operation in poten-
tially explosive areas. When using the devices in
potentially explosive areas, preventive measures
must be taken, e. g. within suitable enclosure.
For starter combinations with TF140DU devices
and AF motor contactors appropriate protection
against short-circuit is to be selected for reaching
coordination type "2" according to EN 60947-4-1.
Information regarding verified starter combina-
tions is provided online by ABB.
see "Coordination tables for motor protection"
http://applications.it.abb.com/SOC/Page/
Selection.aspx
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