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BETA Monitoring
Monitoring of Plants and Devices
5
TT3 43 thermistor motor protection relays
14/28
Siemens ET B1 · 10/2008
*
You can order this quantity or a multiple thereof.
14
■
Overview
Thermistor motor protection relays monitor the thermistors
wound in motors. This helps prevent thermal motor overloads,
e.g. due to high switching frequency, single-phasing, disabled
cooling or excessive ambient temperatures. Up to 6 thermistors
in series can be monitored. A conductor break in the sensor
conductor will immediately trip the device. The device can also
be used for monitoring wound quick-break switches – e.g.
bimetal thermostats. This offers all-round motor protection.
•
For the detection of
-
Temperature limits being exceeded
-
Wire breaks in sensor circuits
• 1
input for 1 to 6 thermistors
•
With 2 LEDs green/red for ready-to-run and fault
•
Response value: 3.2 to 3.8 k
•
Release value: 1.5 to 1.8 k
•
Max. cable length of the sensor supply cable NYM 2 × 1.5
is 100 m
•
Remote Reset: over A1/A2 (NC contact) or over X1/X2
(
NO contact)
LED displays:
•
Green LED: lights up when operational voltage is applied
•
Red LED: lights up in the event of overtemperatures or an
interruption in the sensor circuit.
■
Benefits
•
The test button for the diagnosis of the devices ensures high
functional reliability for users
•
The ultra compact thermistor motor protection relay requires
only the smallest of spaces. This saves costs
•
A remote reset enables the device to be switched back on
again centrally at any time. This increases plant availability.
■
Technical specifications
■
Selection and ordering data
5
TT3 431
5
TT3 432
Standards
IEC 60255; DIN VDE 0435-110
Rated control voltage U
c
V AC 230
Operating range
× U
c
0.9 ... 1.1
Rated frequency
Hz
50/60
Response value
k
3.2 ... 3.8
Release value
k
1.5 ... 1.8
Minimum contact load
V; mA 10; 100
Rated insulation voltage U
i
Between coil/contact
kV
4
Rated impulse withstand voltage U
imp
Actuator/contact
kV
> 2.5
Contacts
contact (AC-11)
A
3
•
Rated operational voltage U
e
V AC 230
•
Rated operational current
I
e
A
5
Actuator/contact
mm 4
Terminals
•
Terminals
±
screw (Pozidriv)
PZ 1
•
Conductor cross-sections
-
Rigid
Max.
mm
2
2
× 2.5
-
Flexible, with end sleeve
Min.
mm
2
1
× 0.5
Permissible ambient temperature
°C
-20 ...
+60
Resistance to climate
Acc. to EN 60068-1
20/60/4
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 AC V AC
Unit(s) Unit(s) kg
Thermistor motor protection relays
230
5
230
2
B
5
TT3 431
027 1
1
0.160
With fault storage,
reset pushbutton and remote reset
230
5
230
2
B
5
TT3 432
027 1
1
0.160
© Siemens AG 2008