SIEMENS
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Siemens IC 10 · 2017
Contactor Relays
SIRIUS 3RH2 contactor relays, 4- and 8-pole
5
Standards
IEC 60947-1, EN 60947-1,
IEC 60947-4-1, EN 60947-4-1,
IEC 60947-5-1, EN 60947-5-1
The 3RH2 contactor relays are available with screw or
spring-type terminals. The basic unit contains four contacts
with terminal designations according to EN 50011.
The 3RH2 contactor relays are suitable for use in any climate.
They are finger-safe according to IEC 60529.
The 3RH21 coupling contactor relays for switching auxiliary
circuits are tailored to the special requirements of working with
electronic controls.
Contact reliability
High contact stability at low voltages and currents, suitable for
solid-state circuits with currents
1 mA at a voltage of
17 V.
Surge suppression
RC elements, varistors, diodes or diode assemblies (combina-
tion of a diode and a Zener diode) can be plugged onto all 3RH2
contactor relays from the front for damping opening surges in
the coil. The plug-in direction is determined by a coding device.
Coupling contactor relays have a low power consumption and
an extended solenoid coil operating range.
Depending on the version, the solenoid coils of the coupling
contactor relays are supplied without overvoltage damping
(versions 3RH21..-.HB40 or 3RH21..-.MB40-0KT0) or with a
diode or suppressor diode connected as standard.
Accessories
The accessories for the 3RT2 contactors in size S00
can also be used for the 3RH2 contactor relays
(see from page 3/75 onwards)
.
Auxiliary switch blocks
The 3RH21 contactor relays (with the exception of coupling
contactor relays) can be expanded by up to four contacts by the
addition of mounted auxiliary switch blocks.
The auxiliary switch block can easily be snapped onto the front
of the contactor relays. The auxiliary switch block has a centrally
positioned release lever for disassembly.
The conventional front auxiliary contacts fulfill the characteristics
of positively driven operation and are therefore suitable for safety
applications.
Article No. scheme
Note:
The Article No. scheme shows an overview of product versions
for better understanding of the logic behind the article numbers.
For your orders, please use the article numbers quoted in the
selection and ordering data.
Product versions
Article number
SIRIUS contactor relays
3RH2
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@
@
–
@
@
@
@
0
–
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Device type
e. g. 1 = 4-pole motor contactor
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Number of NO contacts
e. g. 2 = 2 NO
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Number of NC contacts
e. g. 2 = 2 NC
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Type of electrical connection
Screw terminals
1
Spring-type terminals
2
Operating range/solenoid coil circuit
e.g. A = AC standard/without coil circuit
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Rated control supply voltage
e.g. P0 = 50/60 Hz 230 V AC
@
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Special version
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Example
3RH2
1
2
2
–
1
A
P
0
0
© Siemens AG 2016