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BLITZDUCTOR ® XTU
Universal lightning current / surge arrester
Modular design
Completely mounted BLITZDUCTOR
XTU. Space-saving two-part design
with base part and protection module
for DIN rail mounting. The module
locking mechanism ensures safe
operation, thus the arrester provides
protection against vibration
effects and shock loads up to a 30-
fold acceleration of gravity. The
function-optimised design of the
arrester ensures both fast and easy
replacement of the protection module
which houses all relevant protection
elements.
LifeCheck module
BXTU ML2 ... S ...
2
4
Pluggable DIN Rail Mounted SPDs
1 2 3 4 4´ 3´ 2´ 1´
1
3
Base part
BXT BAS 9
Direct / indirect shield earthing
If the line shield cannot be directly earthed on both sides for technical
reasons, one-sided indirect shield earthing might be advisable. This can
be achieved by using arrester modules of type BXTU ML2 BD S 0-180. The
lightning current carrying gas discharge tube in the protection module at
terminal 3, 3’ prevents low-frequency compensating currents. Transient
interference is thus discharged via indirect shield earthing.
2’
4’
1’
3’
2'4'
1'3'
1 3
2 4
Connecting the lines to the base part
Up to four lines can be connected on two levels. For DIN rail mounting
purposes, lines of a pair belonging to each other are connected on top of
one another.
Accessory for EMC spring terminals
In conjunction with the two-pole BXTU
module, the terminals in the base part
can be used for shield earthing. In particular
in bus systems, it is advisable to
use the EMC spring terminal for largearea
connection of line shields to the
equipotential bonding. Direct or indirect
shield earthing can be implemented by
means of the accessory supplied with
EMC spring terminals.
click
Safe installation of the arrester
The function-optimised design of the arrester allows both to safely plug
the protection module into the base part and to remove it without problems.
The module is secured in the base part by snapping it in (audible
click). When pressing the grey buttons, the module can be removed with
little effort. This is ensured by the laminated spring contacts and the
module release spring. A mechanical reverse voltage protection ensures
that the module is installed in the correct position.
LifeCheck monitoring function
The LifeCheck function allows to easily and quickly test arresters without
removing the module from the system circuit. Integrated into the protection
modules, LifeCheck permanently monitors the status of the arrester.
Like an early warning system, LifeCheck reliably detects potential electrical
and thermal overload of the protection components. The LifeCheck
status can be read out within a matter of seconds by means of
DEHNrecord LC via contactless RFID technology. A stationary
DEHNrecord MCM condition monitoring system allows status-oriented
maintenance of 10 BXTU arresters.
182 www.dehn.de