Solid-State Time Relay Blocks With Semiconductor Output; Figure 3-45: Time-Delay Auxiliary Switches, Function Diagrams (Frame Sizes S0 To S3) - Siemens sirius System Manual

Function
diagrams

3.4.3 Solid-state time relay blocks with semiconductor output

Variants
On-delay and off-delay
functions
Connection: on-delay
time relay block
Connection: off-delay
time relay block
Conductor cross-sec-
tions
SIRIUS System Manual
GWA 4NEB 430 0999-02b
A1/A2
27/28
35/36
t
>
200 ms
A1/A2
27/28
35/36
t
A1/A2
Y 27/28
D
37/38
50 ms
t

Figure 3-45: Time-delay auxiliary switches, function diagrams (frame sizes S0 to S3)

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.
The following variants of the time-delay auxiliary switch are available:
• On-delay (integrated varistor)
• Off-delay with auxiliary supply (integrated varistor)
The time-delay auxiliary switch in the on-delay or off-delay with an auxiliary
supply variants 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.
The on-delay time relay block is connected in series to the contactor coil;
the A1 terminal of the contactor coil must not be connected.
When an off-delay time relay block is attached, the contactor coil is con-
tacted via the time relay block; the A1 and A2 terminals of the contactor coil
must not be connected.
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
Star-delta function
1 NO contact, instantaneous
1 NO contact, delayed
3RT1/3RH1 contactors
3-67