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BETA Monitoring
Monitoring of Electrical Values
7
LQ3 insulation monitors for medical premises
13/28
Siemens ET B1 · 10/2008
13
Voltage relays
5
TT3 411
5
TT3 412
Rated control voltage U
c
V AC
230
230/400
Overload capability
× U
c
1.15
1.1
Rated frequency
Hz
50/60
Response values
ON-switching
OFF-switching
× U
c
2 %
hysteresis
0.9
4 %
hysteresis
0.9
Minimum contact load
V/mA
10/100
Phase failure detection
At L1, L2 or L3
ms
--
100
N-conductor monitoring
--
Yes
Rated insulation voltage U
i
Between coil/contact
kV
4
Contacts
NO contacts AC 15
NC contacts AC 15
3
2
3
1
Electrical service life in switching cycles
AC 15, 1 A, 230 V AC
5
× 10
5
Rated impulse withstand voltage
Acc. to IEC 60664-1
kV
4
Degree of pollution
2
Terminals
± screw (Pozidriv)
2
Conductor cross-sections
•
Rigid
•
Flexible, with end sleeve
mm
2
mm
2
2
× 2.5
2
× 1.5
Permissible ambient temperature
°C
-20 …
+60
Resistance to climate
Acc. to EN 60068-1
20/060/04
© Siemens AG 2008