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Siemens IC 10 · 2017
Switching Devices – Soft Starters and Solid-State Switching Devices
Introduction
6
SIRIUS 3RF solid-state switching devices
Three-phase solid-state contactor and single-phase solid-state relay
The SIRIUS 3RF2 solid-state switching devices reliably switch a
wide range of different loads with alternating voltages in 50 and
60 Hz systems.
SIRIUS 3RF2 solid-state switching devices for resistive loads:
• Solid-state relays
• Solid-state contactors
• Function modules
SIRIUS 3RF3 solid-state switching devices for switching motors:
• Solid-state contactors
• Solid-state reversing contactors
SIRIUS 3RF2 – for almost unending activity
Conventional electromechanical controlgear is often overtaxed
by the rise in the number of switching operations. A high
switching frequency results in frequent failure and short
replacement cycles. However, this does not have to be the case,
because with the latest generation of our SIRIUS 3RF2 solid-
state switching devices we provide you with solid-state relays
and contactors with a particularly long endurance – for almost
unending activity even under the toughest conditions and under
high mechanical load, but also in noise-sensitive areas.
Proved time and again in service
SIRIUS 3RF2 solid-state switching devices have firmly
established in industrial applications. They are used above all in
applications where loads are switched frequently – mainly with
resistive load controllers, with the control of electrical heat or the
control of valves and motors in conveyor systems. In addition to
its use in areas with high switching frequencies, their silent
switching means that SIRIUS is also ideally suited for use in
noise-sensitive areas, such as offices or hospitals.
The most reliable solution for any application
Compared to mechanical controlgear, our SIRIUS 3RF2 solid-
state switching devices stand out due to their considerably
longer service life. Thanks to the high product quality, their
switching is extremely precise, reliable and, above all,
insusceptible to faults. With its variable connection methods and
a wide spread of control voltages, the SIRIUS 3RF2 family is
universally applicable. Depending on the individual
requirements of the application, our modular controlgear can
also be quite easily expanded by the addition of standardized
function modules.
Ideal for operation with heating control systems
The 3RF2 solid-state switching devices can be used for example
in the SIPLUS HCS300I heating control system. They are
optimally connected to the digital output module of the HCS300I
by means of preassembled cables. This saves considerable
wiring outlay in the control circuit and shortens mounting time.
The HCS300I is a modular heating control system for the
optimization of plastic processing machines. It enables
individual solutions for many different heating control
applications. With each basic unit it is possible to use up to four
6-channel digital outputs to control solid-state switching devices
and four 4-channel temperature measuring modules. Current or
current-and-voltage measuring modules can be used to monitor
the loads. Communication with the higher-level control system is
performed via PROFIBUS DP.
SIPLUS heating control system
Also for switching motors
In order to achieve higher productivity, the switching frequency
is continuously increased. It is no problem for our SIRIUS solid-
state contactors to switch motors. With three-phase motors up to
7.5 kW, they can reliably withstand even the highest switching
frequencies. Even a continuous change in the direction of
rotation is possible with the solid-state reversing contactors.
Both versions can be perfectly combined with components from
the SIRIUS modular system. Connecting with SIRIUS motor
starter protectors or SIRIUS overload relay can be implemented
without any further steps.
Always on the sunny side with SIRIUS
Because SIRIUS 3RF2 offers even more:
•The space-saving and compact side-by-side mounting
ensures reliable operation up to an ambient temperature
of +60 °C
•Thanks to fast configuration and the ease of mounting and start
up, you save not only time but also expenses.
Connection methods
The solid-state switching devices are available with screw
terminals (box terminals), spring-type terminals or ring terminal
lugs.
Screw terminals
Spring-type terminals
Ring terminal lug connection
The terminals are indicated in the corresponding
tables by the symbols shown on orange backgrounds.
© Siemens AG 2016