SIRIUS 3RT2 contactors/contactor assemblies
2.4 Configuration
SIRIUS Innovations
System Manual, 01/2011, A8E56203870002-03
121
2.4.3.3 Contactors for railway applications
The following information must be taken into account when planning applications involving
contactors for railway applications (versions of the 3RT2 power contactors and
3RH2 contactor relays). All other data corresponds to that of the standard 3RT2 contactors
and 3RH2 contactor relays.
Resistance to extreme climates
SIRIUS 3RT20/3RH2 contactors are safe to touch according to DIN EN 50274.
Ambient temperature
When operating contactors for railway applications (versions of the 3RT20 power contactors
and 3RH21 contactor relays) at the full magnet 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 contactor drive
An important railway requirement as regards SIRIUS contactors is the extended operating
range of the contactor drive (0.7 to 1.25 x U
S
). This must be taken into account when
selecting devices for railway applications.
Reference
More information ... Can be found in the chapter titled ...
About the environments in which contactors for
railway applications are used
Contactors with extended operating range
(Page 266)
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