3Rt1446 Contactors With 3 Main Contacts For Switching Resistive Loads (Ac-1); Table 3-10: Comparison Between The 3Rt1446 And 3Rt1046 Contactors - Siemens sirius System Manual

Increasing the power

3.3.2 3RT1446 contactors with 3 main contacts for switching resistive loads (AC-1)

Field of application
Switching capacity
Comparison: 3RT1046/
3RT1446
Note on configuration
Accessories
SIRIUS System Manual
GWA 4NEB 430 0999-02b
The ease of expansion is an advantage for configuration. In many applica-
tions there is enough space to insert the contactor with the next higher rat-
ing class and thus increase motor output.
The 3RT14 46 contactors with 3 main contacts for switching resistive loads
are used for applications in the AC-1 utilization category:
• Switching of resistive loads such as heating systems or resistance fur-
naces
• Applications in which a low switching capacity is sufficient
• Applications in which high continuous currents occur without peaks (e.g.
as a generator contactor or in the case of variable-speed drives.
1.5 times the I /AC-1 can be switched on and off. Switching off higher cur-
e
rents, with the emergency stop, for example, is possible up to 8 times the
I /AC-3 current.
e
The following table shows you the difference between the 3RT1446 and
3RT1046 contactors for normal AC-3 applications:
Contact material
3RT1446 Contact material with high
current-carrying capacity and
better thermal properties
3RT1046 Contact material that ensures
better switching capacity

Table 3-10: Comparison between the 3RT1446 and 3RT1046 contactors

The 3RT10 range of contactors for switching motors also has a specific AC-1
switching capacity. It is much less costly, however, to use the AC-1 contac-
tor 3RT14 for this specific purpose.
You can use the same accessories for the 3RT14 contactors as you can for
the 3RT104 contactors in frame size S3.
3RT1/3RH1 contactors
Conducting paths
Larger conducting paths that
permit better cooling
3-21