Contactors For Railway Applications - Siemens SIRIUS 3RT Series System Manual

SIRIUS 3RT2 contactors/contactor assemblies
2.4 Configuration
2.4.8.3

Contactors for railway applications

Special versions of the power contactors and contactor relays with an extended temperature
range are available for use in railway applications, with voltages of 24 V DC and 110 V DC in
the control circuit. Different coil voltages can be obtained on request from Technical
Assistance (www.siemens.com/lowvoltage/technical-assistance).
The relevant requirements are met for size S00 by means of a series resistor and for size S0
via an electronic drive. Coupling relays for railway applications are also available.
The extended temperature range of -40 to +70 °C applies to all contactors for railway
applications.
Reference
More information ...
About the extended operating ranges of the
individual contactor versions
Contactors with series resistor (size S00)
The DC magnet system of these contactors is switched on with a defined overexcitation due
to the extended operating range of 0.7 to 1.25 x U
switches over to holding excitation.
Design
The contactors are available with a plug-on module containing the series resistor (the NC
contact required for switchover is integrated in the basic device and already fully wired). The
DC magnet coils of the contactor versions are fitted with suppressor diodes to provide
protection against overvoltage as standard. The opening delay is consequently 2 ms to 5 ms
longer than for standard contactors.
The power contactors with series resistor are identified by the suffix -0LA0 as the
13th to 16th digits of the order number (3RT201.-2K.42-0LA0). The order number for
contactor relays with series resistor is 3RH2122-2K.40-0LA0.
Note
According to DIN EN 50005, these versions of contactor relays and motor contactors can be
expanded by means of a 4-pole auxiliary switch block on the front Two lateral auxiliary
switch blocks can also be mounted on the motor contactor.
Mounting instruction
Motor contactors and contactor relays of size S00 are approved for side-by-side mounting at
ambient temperatures of up to 70 °C.
Contactors with electronic drive (size S0)
The 3RT202.-.X.40-0LA2 motor contactors are controlled via an electronic drive, which
guarantees an operating range of 0.7 to 1.3 U
128
Can be found in the chapter titled ...
Overview (Page 127)
. Following switch-on, the series resistor
S
at an ambient temperature of 70 °C.
S
System Manual, 01/2011, A8E56203870002-03
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