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SIRIUS
Siemens Industry, Inc. Industrial Control Product Catalog 2017
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2
COnTACTORS And
ASSEMbliES
3RT, 3RH Contactors for Special Applications
Contactors with Extended Operating Range 0.7 ... 1.25 x , for Railway Applications
3RH21 contactor relays
3/53
SIRIUS Innovations Supplement 2012
3
Overview
DC operation
IEC 60947-4-1, EN 60947-4-1, for requirements according to
IEC 60077-1 and IEC 60077-2.
The contactor relays are finger-safe according to EN 50274. The
size S00 contactor relays have spring-type connections for all
terminals.
Ambient temperature
The permissible ambient temperature for operation of the con-
tactor relays (across the full coil operating range) is -40 to
+70 °C.
Uninterrupted duty at temperatures > +60 °C reduces the
mechanical endurance, the current carrying capacity of the con-
ducting paths and the switching frequency.
Control and auxiliary circuits
The solenoid coils of the contactor relays have an extended coil
operating range from 0.7 to 1.25 x U
s
and are fitted as standard
with suppressor diodes to provide protection against overvolt-
age. The opening delay is consequently 2 to 5 ms longer than for
standard contactors.
Application
For operation in installations which are subject both to consider-
able variations in the control voltage and to high ambient tem-
peratures, e. g. railway applications under extreme climatic
conditions, rolling mills, etc.
Also for control supply voltages with battery buffer for longer
operating times should the battery charging fail.
Contactor relays without series resistor
Control and auxiliary circuits
These contactor relays have an extended operating range from
0.7 to 1.25 x U
s
; the solenoid coils are fitted with a suppressor
diode. An additional series resistor is not required.
Note:
An additional auxiliary switch block cannot be mounted.
Side-by-side mounting
A clearance of 10 mm is required for side-by-side mounting at
ambient temperatures > 60 °C
≤ 70 °C.
Contactor relays with series resistor
Control and auxiliary circuits
The DC solenoid systems of the contactor relays are modified (to
hold-in coil) by means of a series resistor.
The size S00 contactor relays are supplied prewired with a plug-
on module containing the series resistor. The suppressor diode
is integrated.
A 4-pole auxiliary switch block (according to EN 50005) can be
fitted additionally.
Side-by-side mounting
Side-by-side mounting is permitted at ambient temperatures up
to 70 °C.
L-
L+
32
31
24
23
14
13
+E1
K1
K1
-A2
NSB0_02177
V
R
S1
U
s
LV1N_03_06.fm Page 53 Thursday, October 31, 2013 11:31 AM
Contactors and Contactor Assemblies
3RT, 3RH Contactors for Special Applications
3RH21 contactor relays