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BETA Monitoring
Monitoring of Electrical Values
5
TT3 phase and phase sequence monitors
13/20
Siemens ET B1 · 10/2008
*
You can order this quantity or a multiple thereof.
13
■
Overview
Phase monitors monitor the voltages in three-phase system and
signal the power failure of one or more phases over a floating
contact. Phase sequence monitors monitor the phase sequence
in three-phase systems and signal any changes in the phase
sequence – change of rotating field – over a floating changeover
contact.
■
Benefits
•
The three-phase LED in the phase monitor and the LED in the
phase sequence monitors provide constant information on the
switching state of the plant
•
The compact design in 1 MW saves space.
■
Technical specifications
■
Selection and ordering data
5
TT3 421
5
TT3 423
Standards
IEC 60255; DIN VDE 0435
Rated control voltage U
c
V AC 230/400
400
Operating range
× U
c
0.8 ... 1.1
Rated frequency
Hz
50/60
Rated power dissipation P
v
Electronics
VA
9
Contacts
VA
0.2
Rated operational voltage U
e
V AC 250
Rated operational current
I
e
A
4
Minimum contact load
V; mA 10; 100
Rated insulation voltage U
i
Between coil/contact
kV
4
Contacts
contact (AC-11)
A
3
Electrical isolation
Creepage distances and clearances
Actuator/contact
mm 4
Rated impulse withstand voltage U
imp
Actuator/contact
kV
> 2.5
Terminals
±
screw (Pozidriv)
1
Conductor cross-sections
Rigid, max.
mm
2
2
× 2.5
Flexible, with end sleeve, min.
mm
2
–
Degree of protection
Acc. to EN 60529
IP20, with connected conductors
Safety class
Acc. to EN 61140/ VDE 0140-1
II
Permissible ambient temperature
°C
-20 ...
+60
Resistance to climate
Acc. to EN 60068-1
20/60/4
Contacts
U
e
I
e
U
c
MW DT Order No.
Price
per PU
PG PU PS*/
P. unit
Weight
per PU
approx.
V AC A
V AC
Unit(s) Unit(s) kg
Phase monitors
With 3 green LEDs for 3 phases
1
CO
250 4
230/400 1
}
5
TT3 421
027 1
1
0.060
Phase sequence monitors
With one green LED,
which lights up for right-rotating field
1
CO
250 4
400
1
}
5
TT3 423
027 1
1
0.050
© Siemens AG 2008