Application And Areas Of Use; 3Rt10 Contactors With 3 Main Contacts For Switching Motors - Siemens sirius System Manual

3RT1/3RH1 contactors

3.3 Application and areas of use

3.3.1 3RT10 contactors with 3 main contacts for switching motors

Field of application
Frame sizes
Dimensions
Power ratings
3-20
Various switching devices are available for switching electrical loads. The
contactor is most suitable device for frequent switching operations.
Contactors are the most commonly used switching device in industry,
mechanical engineering and in switchgear and controlgear. Due to the
increased automation of production, contactors have become more impor-
tant, involving greater and often different types of demands.
Automated production systems are considerably more sensitive to opera-
tional malfunctions than manually operated systems. Each fault on an elec-
trical device means downtimes, wastage, loss of production and often con-
siderable outlay in order to get the system up and running again.
For this reason, we concentrated on high reliability when developing the
SIRIUS contactor range. This includes, in particular, increased service life,
high contact reliability, and the possibility to use the contactors at higher
ambient temperatures in the cubicle. It is possible to use the contactors up
to 60 °C and also without derating when the devices are installed in a row.
To deal with the variety of possible applications, there are also contactor
variants for special applications, such as for switching resistive loads or
capacitors, in addition to the main 3RT10 range of contactors (for switching
motors).
The different contactor ranges and their possible applications are described
in the following subsections.
The 3-pole 3RT10 contactors use 3 NO contacts as main contacts. They are
mainly used to switch three-phase induction motors.
The full performance range from 3 to 45 kW/400 V (utilization categories AC-
2 and AC-3) is covered by 4 frame sizes.
The frame sizes cover the following levels of standard motor output:
• Frame sizes S00, S2, S3: three standard levels of motor output each
• Frame size S0: 4 standard levels of motor output
The contactors are provided with alternating or direct current magnetic sys-
tems. The required floor areas of the devices of the two operating mecha-
nism types are the same. As of frame size S0, the installation depth for con-
tactors with the DC magnet system is between 10 mm and 15 mm greater
than for the variants with the AC magnet system.
All the specified power and current ratings apply to an ambient temperature
of 60 °C without derating.
SIRIUS System Manual
GWA 4NEB 430 0999-02b