User Guide

3RT1 contactors/ 3RH1 control relays
SIRIUS System Manual
3-14 GWA 4NEB 430 0999-02 DS 01
Auxiliary contacts and
snap-on accessories
• A uniform and diverse range of auxiliary switches and accessories that
can be quickly upgraded and replaced is available for 3RT1 contactors up
to 45 kW for various applications.
• The 3RH auxiliary contactors can be extended to form variants with a
maximum of 8 poles using attachable 2 or 4-pole auxiliary switch blocks.
• Wiring kits with and without mechanical interlocking are available for put-
ting together 3RA contactor combinations for reversing and for wye-delta
starting.
The accessories are described in detail in Section 3.4, "Accessories".
3.2.1 Coil systems S00 to S3
Table 3-7: Coil systems
3.2.2 Coil systems S6 to S12
The SIRIUS-contactor frame sizes S6 to S12 include the following designs:
• Air-break contactors in 3 frame sizes
- 3RT10, switching of motors
- 3RT14, AC-1-applications
• 3RT12 Vacuum contactors in 2 frame sizes for the switching of motors
• 2 magnetic coils, both for UC-operation:
- conventional coil
- electronic coil
• Withdrawable coils
Coil types "conven-
tional" and
"electronic"
The similarities between the two coil types are:
UC-operation, this means the contactors can be controlled with either AC
(40 to 60 Hz) or DC.
Integrated coil protective circuit with varistor. For most applications, this
should be a sufficient protective circuit against the switching overvoltage of
the magnetic coil. For especially sensitive applications where further steps
to dampen the effects may be necessary, an additional RC-element (acces-
sory) can be plugged in.
Exception:
For the designs with the Remaining lifetime indicator an additional RC-ele-
ment cannot be plugged in.
AC coil for
AC-control
• Automatic reduction from high closing power to
low holding power
• Short switching times
DC coil for
DC-control
• Larger unit volumes (to achieve a tensile force
comparable to that of an AC coil)
• Closing power = holding power
• Longer switching times