Applications - Siemens SIRIUS 3RT Series System Manual

SIRIUS 3RF34 solid-state switching devices
3.2 Product description
3.2.2

Applications

Solid-state switching devices for switching motors
The solid-state contactors for the wear-free and noiseless switching of motors are designed
for the frequent switching on and switching off of AC drives up to 7.5 kW as well as for
reversing up to 3.0 kW. The devices are fully insulated and can be mounted directly on motor
starter protectors and overload relays or SIRIUS current monitoring relays, which makes
them really easy to integrate into motor feeders.
These 3-phase solid-state contactors are equipped with a 2-phase control which is
particularly suitable for typical motor circuits without a connection to the neutral conductor.
The integration of four current paths to form a single reversing circuit, accommodated in one
enclosure, makes the solid-state reversing contactor a particularly compact solution. Unlike
conventional systems which require two contactors, width can be reduced by up to 50% with
the 3-phase solid-state reversing contactors. Devices with a width of 45 mm cover motors up
to 2.2 kW and those with a width of 90 mm cover motors up to 3 kW.
Integration in the SIRIUS modular system facilitates connection to a SIRIUS motor starter
protector via a link module or to a 3RB30/3RB31 solid-state overload relay or a 3RR2 current
monitoring relay without additional steps. As a result, fuseless or fused motor feeders can be
implemented quickly and easily.
Main features:
● Insulated enclosure with integrated heat sink
● Degree of protection IP20
● Integrated mounting foot for snapping on a DIN rail or mounting on a support plate
● Variety of connection systems
● Plug-in control connection
● LED to indicate control voltage
Reference
More information ...
About link modules
About the overload relay
About current monitoring relays
318
Can be found in the chapter titled
Description (Page 348)
Overload relays (Page 485)
Current monitoring relays (Page 683)
System Manual, 01/2011, A8E56203870002-03
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