Siemens SIRIUS 3RT Series System Manual page 39

Product example contactors
● Minimized holding and closing power.
– The aspects of low power loss and further optimization of the holding and closing
– SIRIUS contactors with electronically controlled coils support further reduction of the
– All SIRIUS contactors can be used on the Chinese market, as they meet the Chinese
Product example compact starters
● Only one switching point for minimized losses on the current path.
– Thanks to the combined functions of a solid-state overload relay, a motor starter
Product example overload relays
● Electronics instead of bimetal for minimized intrinsic power loss.
– In addition to a wide setting range of up to 1:10, the application of electronic sensors
● Optimized thermal release (bimetal).
– For devices with thermal overload relay, the power loss compared to predecessor
SIRIUS Innovations
System Manual, 01/2011, A8E56203870002-03
power ratings played an important role in the development of SIRIUS contactors.
holding power by up to 90%.
energy efficiency standard GB 21518-2008 for AC contactors in accordance with
"Grade 2". The contactors thus far exceed the minimum requirement ("Grade 3") and
are optimally equipped for the future.
protector, and a contactor in a single device, transfer resistances (switching points,
cable transitions, etc.) are reduced to a minimum.
and actuators facilitates intrinsic power loss reductions of more than 98%.
products is reduced by 5 to 10% thanks to the optimized bimetal release.
System overview
1.5 System properties
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