Siemens SIRIUS 3RW40, Manual

Page: 134 / 212

Technical data
13.2 3RW40
SIRIUS 3RW30 / 3RW40
134
Manual, 01/2010, 535 1995-02 DS01
13.2 3RW40
13.2.1 Overview
SIRIUS 3RW40 soft starters have all the same advantages as the 3RW30 soft starters.
SIRIUS 3RW40 soft starters are characterized above all by their small space requirements.
Integral bypass contacts mean that no power loss has to be taken into account at the power
semiconductors (thyristors) after the motor has started up. This cuts down on heat losses,
enabling a more compact design and making external bypass circuits superfluous.
At the same time, this soft starter comes with additional integrated functions such as settable
current limiting, motor overload and intrinsic device protection, and optional thermistor motor
protection. The higher the motor rating, the more important these functions become because
they make it unnecessary to purchase and install protection equipment (such as overload
relays).
Internal intrinsic device protection prevents thermal overloading of the thyristors and the
power unit defects this can cause. As an option, the thyristors can also be protected against
short-circuiting with semiconductor fuses.
Thanks to integrated status and fault monitoring, this compact soft starter offers many
different diagnostics options. Up to four LEDs and relay outputs permit differentiated
monitoring and diagnostics of the operating mechanism by indicating the operating state as
well as, for example, mains or phase failures, missing load, impermissible tripping times /
CLASS settings, thermal overloading, or device faults.
Soft starters rated up to 250 kW (at 400 V) can be supplied for standard applications in three-
phase systems. Extremely small sizes, low power losses, and simple commissioning are just
three of the many advantages of the SIRIUS 3RW40 soft starters.
"Increased safety" type of protection EEx e according to ATEX Directive 94/9/EC
The SIRIUS 3RW40 soft starter sizes S0 to S12 are suitable for starting explosion-proof
motors with the "increased safety" type of protection EEx e.