Siemens SIRIUS 3RV1.2 System Manual

3RT1/3RH1 contactors
SIRIUS System Manual
GWA 4NEB 430 0999-02b
3-67
Function
diagrams
Figure 3-45: 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.
Varian ts
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 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.
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 connected.
Connection: off-delay
time relay block
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.
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
Star-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

Siemens SIRIUS 3RV1.2 Specifications

General

Brand	Siemens
Model	SIRIUS 3RV1.2
Category	Relays
Language	English