3RT1/3RH1 contactors
SIRIUS System Manual
3-64
GWA 4NEB 430 0999-02b
3 3RT1/3RH1 contactors
3.4.2 Time-delay auxiliary switches
Varian ts
The following variants of the time-delay auxiliary switch are available:
•On-delay
• Off-delay without auxiliary supply
• Star-delta function
On-delay and off-delay
functions
The time-delay auxiliary switch in the on-delay or off-delay variants has the
following features:
• It facilitates time-delayed functions up to 100 s
• 3 single time areas
• Contains a relay with 1 NO contact and 1 NC contact that switches the
on-delay or off-delay depending on the version.
Star-delta function
The time-delay auxiliary switch with star-delta function has the following fea-
tures:
• Equipped with a delayed and an instantaneous NO contact between
which there is an idle time of 50 ms.
• The delay time of the NO contact can be set at between 1.5 s to
30 seconds.
• The contactor on which the time-delay auxiliary switch block is mounted
functions instantaneously.
Conductor cross-sec-
tions
The permissible conductor cross-sections correspond to the auxiliary con-
ductor terminals of the corresponding frame size.
3.4.2.1 Frame size S00 (3RT1916-2E, -2F, -2G)
Description
The time-delay auxiliary switch of frame size S00 has the following features:
• The power supply is provided using plug-in contacts directly via the coil
connections of the contactors, parallel to A1/A2.
• The time function is activated when the contactor that has the auxiliary
switch block mounted on it is switched on.
• The off-delay version functions without an auxiliary supply.
• The minimum on-time is 200 ms.
• To dampen switching overvoltages of the contactor coil, a varistor is inte-
grated in the time-delay auxiliary switch of frame size S00.
Information on mount-
ing
Note about the off-delay without auxiliary supply function:
The position of the output contacts is not defined at shipment (bistable
relay). Apply the control supply voltage once, and then switch it off again to
set up the initial state of the contacts.
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