Siemens SIRIUS 3RH Series, System Manual

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SIRIUS 3RT2 contactors/contactor assemblies
2.7 Accessories
SIRIUS Innovations
System Manual, 01/2011, A8E56203870002-03
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2.7.4 EMC suppression module
2.7.4.1 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 performance 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 2- 32 Versions of the EMC suppression module
Design of the EMC suppression module Order number
RC circuit 3RT2916-1PA
Varistor circuit 3RT2916-1PB