User Guide

3RT1 contactors/ 3RH1 control relays
SIRIUS System Manual
3-36 GWA 4NEB 430 0999-02 DS 01
3.3.2 3RT14 contactors with 3 main contacts for switching resistive loads (AC-1)
Field of application The 3RT14 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.
Switching capacity 1.5 times the I
e
/AC-1 can be switched on and off. Switching off higher cur-
rents, with the emergency stop, for example, is possible up to 8 times the
I
e
/AC-3 current.
Comparison: 3RT14/
3RT10
The following table shows you the difference between the 3RT14 and 3RT10
contactors for normal AC-3 applications:
Planning note The 3RT10 range of contactors for switching motors also has a specific AC-1
switching capacity. However the more economic solution would be to use
the 3RT14 AC-1 contactor for this specific purpose.
Accessories You can use the same accessories for the 3RT14 contactors as you can for
the 3RT10 contactors.
Contact material Conducting paths
3RT14
Contact material with high cur-
rent-carrying capacity and better
thermal properties
Larger conducting paths that
permit better cooling
3RT10
Contact material that ensures
better switching capacity
Table 3-14: Comparison between the 3RT14 and 3RT10 contactors