Contactors With An Extended Operating Range (3Rh11 - Siemens sirius System Manual

Control current circuits
and auxiliary current
circuits
With/without a series
resistor
3.3.5.1 Contactors with an extended operating range (3RH11...-0LA0/3RT10...-0LA0)
Arrangement of compo-
nents in frame size S00
Arrangement of compo-
nents in frame sizes S0
to S3
Auxiliary contacts
SIRIUS System Manual
GWA 4NEB 430 0999-02b
The magnet coils of the contactors have an extended operating range of 0.7
to 1.25 x U and are wired with varistors as standard to provide protection
s
against overvoltage. This increases the time to contact parting compared
with standard contactors by 2 ms to 5 ms.
The 3RH11 and 3RT10 contactors with the suffix -0LA0 at digits 13 to 16 in
the order number are used particularly where, in addition to a wide operat-
ing range and a high ambient temperature of 70 °C, several auxiliary con-
tacts are required. Up to 4 auxiliary contacts can be used in these variants.
To ensure that the magnetic system can produce the required amount of
power at power-up, the contactors initially require a certain amount of over-
excitation. By means of the series resistor, the contactors are switched to
the normal hold-in coil level after power-up.
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.
The two ranges are described in more detail below.
The DC magnetic systems of the contactors must be switched to hold-in
coil level via a series resistor.
Auxiliary contactors and contactors of frame size S00 are available with the
following:
• A built-on block that contains the series resistor (the NC contact required
for the switchover in the basic unit is already wired).
• Integrated varistor
• A 4-pole auxiliary switch block (in acc. with EN 50 005) can also be built
on.
Contactors of frame sizes S0 to S3 are fitted on the front with an auxiliary
switch block with 2 NO contacts + 2 NC contacts. The separate series resis-
tor that is attached at the side next to the contactor on the 35 mm rail has
connecting leads for contactor attachment. An NC contact of the auxiliary
switch block is required for the switchover to hold-in coil level. A circuit dia-
gram with the terminal points is stuck onto each contactor.
One NC contact of the auxiliary contacts is required for the series resistor.
The number of auxiliary contacts that are available beyond this is listed in
the selection and order data. With frame size S00, the auxiliary switch block
that you may need must be ordered separately.
3RT1/3RH1 contactors
3-27