Contactors With An Extended Operating Range; Figure 3-9: Capacitor-Switching Contactors, Circuit Diagram - Siemens sirius System Manual

3RT1/3RH1 contactors
3RT10. capacitor
switching capacity
Operation
Circuit diagram

3.3.5 Contactors with an extended operating range

Field of application
Standards
3-26
Important
Make sure when switching banks of capacitors that you adhere to the speci-
fied minimum inductance between the capacitors connected in parallel that
are to be provided in addition.
The normal 3RT10 contactors for switching motors also have a certain
capacitor switching capacity. Details of this can be found in
Section 3.7, Technical specifications: Utilization category AC-6b, switching of
individual capacitors and switching of low-inductance three-phase capaci-
tors. The tables contain information on the switching of individual capacitors
and the switching of banks of capacitors.
Caution
Only switch to discharged capacitors! Do not carry out a function test by
hand.
The precharging resistors must not be removed as this will damage the con-
tact pieces in circuits with a load.
L1 L2 L3
F0
A1
1 3 5
43
A2
2 4 6 44
C1

Figure 3-9: Capacitor-switching contactors, circuit diagram

The contactors with an extended operating range are used in systems with
strong fluctuations in the control supply voltage and at the same time high
ambient temperatures, such as railway applications in extreme climatic con-
ditions, rolling mills, etc.
Contactors with an extended operating range comply with the following
standards:
• IEC 60 947-4-1
• EN 60 947-4-1 (VDE 0660 Part 102)
• The requirements of IEC 60 077
They are shockproof in acc. with DIN VDE 0106 Part 100.
Exception: the series resistor in frame sizes S0 to S3
SIRIUS System Manual
GWA 4NEB 430 0999-02b