Configuration
6.5 Switching motorized loads
SIRIUS - SIRIUS 3RT Contactors/Contactor assemblies
Manual, 09/2017, A5E03656507120A/RS-AE/006
99
The easy expansion option when it comes to controller building is of advantage when
configuring. In many application cases, when the motor power rating is increased, the space
is also sufficient for the contactor with the next-higher performance level.
Attenuation of the switching overvoltage of the 3RT vacuum contactors
To attenuate overvoltages and to protect the insulation of the motor winding from multiple re-
ignitions when switching off three-phase motors, we recommend you connect 3RT12
vacuum contactors (2T1 / 4T2 / 6T3) on the outgoing side with the main current path
attenuation module (RC element and varistor). This circuit is not necessary when using
motors whose insulation is designed for operation on converters.
The main current path circuit is not required for operation in circuits with converters. The
circuit can be destroyed by the voltage peaks and harmonics, resulting in phase-to-phase
short circuits.
Main current path surge attenuation module for vacuum contactors
The main current path attenuation module is available for the following rated operational
voltages:
● U
e
<= 690 V: 3RT1966-1PV3
● U
e
<= 1000 V: 3RT1966-1PV4
The main current path attenuation module is connected separately from the contactor over a
cable of a length of approximately 35 cm on the outgoing terminal of the 2T1 / 4T2 / 6T3
contactor.
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