User Guide

3RT1 contactors/3RH1 control relays
SIRIUS System Manual
GWA 4NEB 430 0999-02 DS 01
3-43
3.3.6 Contactors with an extended operating range
Field of application The contactors with an extended operating range use a DC magnetic coil.
They are used in systems with strong fluctuations in the control supply volt-
age and at the same time high ambient temperatures, such as railway appli-
cations in extreme climatic conditions, rolling mills, etc.
Standards Contactors with an extended operating range comply with the following
standards:
• IEC 60 947-4-1
• EN 60 947-4-1 (VDE 0660 Part 102)
• The requirements of IEC 60 077
They are shockproof in acc. with DIN VDE 0106 Part 100.
Exception: the series resistor in frame sizes S0 to S3
Control current circuits
and auxiliary current
circuits
The magnet coils of the contactors have an extended operating range of
0.7to1.25xU
s
and are wired with varistors as standard to provide protec-
tion against overvoltage. This increases the time to contact opening when
compared with standard contactors by 2 ms to 5 ms.
With/without a series
resistor
The 3RH11 and 3RT10 contactors with the suffix -0LA0 at digits 13 to 16 in
the order number are used where several auxiliary contacts are required, in
addition to a wide operating range and a high ambient temperature of 70 °C.
Up to 4 auxiliary contacts can be used in these variants.
If fewer auxiliary contacts are required, contactors with the same extended
operating range that work without a series resistor are available up to frame
size S0.
As an alternative to the contactors with a series resistor there is the elec-
tronic control module available for contactors in frame sizes S0 to S3.
Advantages:
• no increase in the mounting width of the series resistor
• lower contact current closing rating
• no auxiliary contact needed for the control of the series resistor
The three ranges are described in more detail below
3.3.6.1 Contactors with series resister (3RH11...-0LA0/3RT10...-0LA0)
The DC magnetic systems of these contactors are, due to their increased
operating range, turned on with a defined overexcitation. As a result of the
power up, there is a switch over to the hold-in coil via the series resistor.
Designs in frame size
S00
Control relays and contactors of frame size S00 are available with the follow-
ing:
• A built-on block that contains the series resistor (the NC contact required
for the switch-over is integrated in the basic unit and is already wired).
• Integrated varistor
• A 4-pole auxiliary switch block (in acc. with EN 50 005) can also be built
on.