SIEMENS
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Siemens IC 10 · 2017
Power Contactors for Switching Motors
Accessories and Spare Parts for SIRIUS 3RT Contactors and SIRIUS 3RH2 Contactor Relays
Accessories
3
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Overview
Auxiliary switches
The auxiliary switches can be designed as positively driven
contacts in 3RH contactor relays or also as mirror contacts in the
case of 3RT power contactors.
For more information on positively driven operation and mirror
contacts,
see Manuals
"More information", page 3/82, and in
the selection and ordering data from page 3/87 onwards
.
Solid-state time-delay auxiliary switch blocks for mounting
on 3RT2 contactors and 3RH2 contactor relays
See pages 3/82 and 3/100
The 3RA28 solid-state time-delay auxiliary switches which can
be mounted onto the contactor are designed for applications in
the range from 24 to 240
V AC/DC (wide voltage range). Both the
electrical and mechanical connection are made by simple snap-
ping on and locking.
The time-delay auxiliary switch is supplied with power directly by
two plug-in contacts through the coil terminals of the contactor,
in parallel with A./A2.
A protection circuit (varistor) is integrated in each module.
A sealable cover is available to protect against careless
adjustment of the set times.
Note:
Mounting more auxiliary switches to the contactor is not
permitted.
Surge suppressors
•
Without LED (also for spring-type terminals)
Sizes S00 to S3,
see page 3/102
•
With LED (also for spring-type terminals):
Sizes S00 to S3,
see page 3/103
All 3RT2 contactors and 3RH2 contactor relays can be retrofitted
with RC elements or varistors for damping opening surges in the
coil. Diodes or diode assemblies (comprising noise suppression
diodes and Zener diodes for short break times) can be used.
The surge suppressors are plugged onto the front of size S00
contactors. Space is provided for them next to a snap-on
auxiliary switch block.
Varistors, RC elements or diode assemblies can be plugged
onto the front of size S0 to S3 contactors.
Coupling contactors are supplied either without overvoltage
damping or with a suppressor diode, varistor or diode con-
nected as standard, according to the version.
Note:
The OFF-delay of the NO contact and the ON-delay of the
NC contact are increased if the contactor coils are attenuated
against voltage peaks (noise suppression diode 6 to 10 times;
diode assembly 2 to 6 times, varistor +2 to 5 ms).
Coupling links for control by PLC
See pages 3/84 and 3/104
•
Operation with 24 V DC
•
Operating range 17 to 30 V
•
Low power consumption of 0.5 W
•
An LED indicates the switching state.
The 3RH2924-1GP11 coupling link has an integrated surge
suppressor (varistor) for the contactor coil being switched and is
mounted onto the size S0 contactor coil via a coil connection
module.
© Siemens AG 2016