Contactors For Railway Applications - Siemens SIRIUS 3RT Manual

6.4.3

Contactors for railway applications

The following information must be taken into account when planning applications involving
contactors for rail applications (versions of the 3RT2 power contactors, 3RH2 contactor
relays, and 3RT1 power contactors in sizes S6 to S12). All other data corresponds to that of
the standard 3RT1 / 3RT2 contactors and 3RH2 contactor relays.
Touch protection
SIRIUS 3RT20 / 3RH2 and 3RT1 contactors (sizes S6 to S12) are finger-safe according to
IEC 60529.
Ambient temperature
When operating contactors for railway applications (versions of the 3RT20 power contactors,
3RH21 contactor relays and 3RT10 power contactors) at the full solenoid coil operating
range, the permissible ambient temperature is between -40 °C and +70 °C.
Note
Continuous operation at temperatures > +60 °C reduces the mechanical durability, the
current carrying capacity of the current paths, and the switching frequency.
Extended operating range of the solenoid coil
An important railway requirement as regards SIRIUS contactors is the extended operating
range of the solenoid coil (0.7 ... 1.25 x U
devices for railway applications.
SIRIUS - SIRIUS 3RT Contactors/Contactor assemblies
Manual, 09/2017, A5E03656507120A/RS-AE/006
). This must be taken into account when selecting
S
Configuration
6.4 Application environment
93