Siemens SIRIUS 3RT - EMC Suppression Module; Description

Accessories
9.5 EMC suppression module
SIRIUS - SIRIUS 3RT Contactors/Contactor assemblies
Manual, 09/2017, A5E03656507120A/RS-AE/006
315
9.5
EMC suppression module
9.5.1
Description
The EMC interference suppression module for size S00 contactors reduces the high-
frequency components and the voltage level of a "counter-source voltage" in three phases.
This results in the following advantages:
●
Reduction of arcing
:
The connection between the main current path and the EMC suppression module
enables arcing, which is responsible for contact erosion and the majority of clicking
noises, to be reduced; this in turn ensures an EMC-compliant design.
●
Increased operational reliability
:
Since the EMC suppression module achieves a significant reduction in radio-frequency
components and the voltage level in three phases, the contact durability is extended
considerably. This makes an important contribution towards enhancing the reliability and
availability of the system as a whole.
●
Omission of fine graduation
:
There is no need for fine graduations within each power class, as smaller motors
inherently have a higher inductance, so that one solution is adequate for all fixed-speed
operating mechanisms up to 5.5 kW.
Versions
Two electrical versions of the EMC suppression module are available.
Table 9- 20 Versions of the EMC suppression module
Design of the EMC suppression module
Article number
RC circuit
3RT2916-1PA
Varistor circuit 3RT2916-1PB