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BETA Monitoring
Monitoring of Electrical Values
5
TT3 voltage relays
13/3
Siemens ET B1 · 10/2008
13
*
You can order this quantity or a multiple thereof.
■
Overview
Voltage relays are used for device and plant protection, supplying
emergency light devices and the detection of N-conductor
breaks and short-time voltage interruptions.
They are available as undervoltage, overvoltage and under/
overvoltage relays. The devices are equipped with different
functions, depending on their intended use, and comply with the
pertinent regulations.
■
Benefits
•
Complete voltage protection in a compact design for overvoltage
and undervoltage monitoring in a single device
•
Plants and devices are reliably and easily protected by
phase-failure relays
•
Overvoltages and consequential damage due to high voltages
are prevented through N-conductor monitoring
•
Asymmetry monitoring in the voltage relay also protects three-
phase AC motors against operation with voltage skew.
■
Technical specifications
5
TT3 400 5TT3 404 5TT3 406 5TT3 194 5TT3 195
5
TT3 401 5TT3 405
5
TT3 402
5
TT3 403
Standards
IEC 60255; DIN VDE 0435-110, -303
Rated control voltage U
c
V AC 230/400
400
Operating range (overload capability)
× U
c
1.1
1.35
Rated frequency
Hz
50/60
Response values
ON-switching
× U
c
0.9/0.95
4 %
hysteresis
OFF-switching
0.7/0.85
0.7 ... 0.95 0.9 ... 1.3
Minimum contact load
V; mA 10; 100
Phase asymmetry
Setting accuracy
% --
Approx.
5 ... 10
--
Approx.
5 ... 10
Repeat accuracy
% --
1
--
1
Phase failure detection
At L1 or L2 or L3
ms
100
--
N-conductor monitoring
--
Yes
--
Rated insulation voltage U
i
Between coil/contact
kV 4
Contacts
contact (AC-11)
A
4
Electrical isolation
Creepage distances and
clearances
Actuator/contact
mm 3
5.5
Rated impulse withstand voltage U
imp
Actuator/contact
kV > 2.5
> 4
Terminals
±
screw (Pozidriv)
1
Conductor cross-sections
•
Rigid, max.
mm
2
2
× 2.5
•
Flexible, with end sleeve, min.
mm
2
0.5
Permissible ambient temperature
°C -20 ... +60
Resistance to climate
Acc. to EN 60068-1
20/60/4
© Siemens AG 2008