Product Overview

3RT1 contactors/3RH1 control relays
SIRIUS System Manual
3-96 GWA 4NEB 430 0999-02 DS 01
Function diagrams
Fig. 3-53: Time-delay auxiliary switches, function diagrams (frame sizes S0 to S3)
3.4.3 Solid-state time relay blocks with semiconductor output
The solid-state time relay blocks are suitable for AC and DC operation. To
dampen switching overvoltages of the contactor coil, a varistor is inte-
grated.
Variants The following variants of the time-delay auxiliary switch are available:
• On-delay (integrated varistor)
• Off-delay with auxiliary supply (integrated varistor)
On-delay and off-delay
functions
The time-delay auxiliary switch in the on-delay or off-delay with an auxiliary
supply has the following features:
• It facilitates time-delayed functions up to 100 seconds.
• 3 individual time ranges
• Contactors with a solid-state time relay block close and open with a delay
according to the time set.
Connection: on-delay
time relay block
The on-delay time relay block is connected in series to the contactor coil;
the A1 terminal of the contactor coil must not be separately connected to
the control supply.
Connection: off-delay
time relay block
When an off-delay time relay block is attached, the contactor coil is con-
nected via the time relay block; the A1 and A2 terminals of the contactor coil
must not be separately connected to the control supply.
Conductor cross-sec-
tions
The permissible conductor cross-sections correspond to the auxiliary con-
ductor terminals of the corresponding frame size.
On-delay
1 NO and 1 NC contact
Off-delay without auxiliary supply
1 NO and 1 NC contact
Wye-delta function
1 NO contact, instantaneous
1 NO contact, delayed
t
NSK-7932
A1/A2
27/28
35/36
t
NSK-7933a
A1/A2
27/28
35/36
200 ms
>
t
NSK-7955
A1/A2
Y 27/28
D 37/38
50 ms