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protected<br />
BLITZDUCTOR ® XT Ex (i)<br />
Surge arrester<br />
SPDs for Use in Potentially Explosive Atmospheres<br />
• Effective protection with minimum space<br />
requirements<br />
• For two-pole, three-pole or four-pole intrinsically<br />
safe interfaces<br />
• Function-optimised design for safe use and<br />
easy installation<br />
• Quick testing of LifeCheck-equipped protection<br />
modules<br />
• ATEX, FISCO approval<br />
Pluggable, multipole, universal surge arrester for use in intrinsically safe<br />
systems with integrated LifeCheck monitoring device<br />
BLITZDUCTOR XT EX is a pluggable, four-pole, universal DIN rail mounted<br />
surge arrester designed for the most stringent requirements on the availability<br />
of intrinsically safe measuring and control circuits and bus systems.<br />
With regard to intrinsic safety, the arrester is considered earth-free and<br />
its self-inductance and self-capacitance are negligibly small. The lowimpedance<br />
arrester design ensures a high impulse current discharge<br />
capacity (min. 10x) and a low voltage protection level.<br />
LifeCheck allows quick and easy testing of arresters. However, the protection<br />
modules may only be read out by means of the hand-held DRC LC<br />
reader in non-explosive atmospheres.<br />
Integrated into the protection modules, LifeCheck permanently monitors<br />
the proper condition of the arrester. Like an early warning system,<br />
LifeCheck reliably detects imminent electrical or thermal overload of the<br />
protection components. The LifeCheck status can be read out within a<br />
matter of seconds by means of the hand-held DEHNrecord LC reader via<br />
contactless RFID technology and also shows the date of the last test of<br />
the protection module. A stationary condition monitoring system allows<br />
condition-based maintenance of 10 BXT arresters.<br />
To ensure safe operation, the arrester provides protection against vibration<br />
effects and shock up to a 30-fold acceleration of gravity. The function-optimised<br />
design of the devices allows quick and easy replacement<br />
of protection modules which house all relevant protection elements. The<br />
protection module and the base part must be ordered separately.<br />
Completely installed BLITZDUCTOR XT<br />
EX. Two-part design with universal base<br />
part and application-specific protection<br />
module. Particularly space-saving, for<br />
DIN rail mounting.<br />
Universal base part accommodates all<br />
types of protection modules. The protection<br />
modules can be easily removed from<br />
the base part without signal interruption<br />
thereby minimising storage requirements<br />
as well as prewiring and maintenance<br />
operations.<br />
BLITZDUCTOR XT EX<br />
Base part<br />
90<br />
7<br />
12<br />
(2/3 mods.)<br />
43<br />
66<br />
Dimension drawing<br />
45<br />
Dimension drawing of a BLITZDUCTOR XT<br />
EX base part with protection module.<br />
Width: 2/3 modules (12 mm), for use in<br />
distribution boards with DIN rails.<br />
Four different versions<br />
BXT ML4 BD EX 24:<br />
Universal LifeCheck-equipped surge<br />
arrester module for protecting two intrinsically<br />
safe circuits such as 4-20 mA,<br />
HART, PROFIBUS.<br />
BXT ML2 BD S EX 24:<br />
LifeCheck-equipped universal surge<br />
arrester module for one intrinsically safe<br />
circuit such as 4-20 mA, PROFIBUS.<br />
Optionally available with direct/indirect<br />
shield earthing.<br />
BXT ML4 BC EX 24:<br />
For protecting, for example three or fourwire<br />
temperature measuring systems.<br />
BXT ML2 BD HF EX 6:<br />
For protecting one pair for fast data transmission<br />
and supply currents up to 4.8 A.<br />
320 www.dehn.de
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