Siemens SENTRON 3KC0 Manual page 67

Contacts
Here are the contacts of the auxiliary switches for transfer switching equipment sizes 1 and
2.
Switching time
You can choose different switching times for the auxiliary switches based on the mounting
position:
● Leading switch-off (only available for sizes 3, 4 and 5). The auxiliary switch switches ≥ 20
ms earlier than the main switch.
● Simultaneous switching (standard): Main switch and auxiliary switch operate
simultaneously.
You can find more information on the mounting position in chapter Mounting auxiliary
switches on sizes 3, 4 and 5 (Page 68).
Auxiliary switch indications
Note
The auxiliary switches indicate the switch position of the respective switch disconnector (I or
II) to which they or the auxiliary switch module are connected.
Two auxiliary switches in total are required for each item of transfer switching equipment in
order to be able to distinguish between all switching positions (I, 0, II). In the case of transfer
switching equipment sizes 1 and 2, two auxiliary switch modules must be mounted on the
transfer switching equipment, one on the left and one on the right. At least one auxiliary
switch must be installed for each auxiliary switch module.
In the case of transfer switching equipment sizes 3 to 5, the two auxiliary switches only need
to be mounted in different rows on the underside of the transfer switching equipment, one
auxiliary switch at switch disconnector I and one at switch disconnector II.
3KC0 manual transfer switching equipment
Manual, 09/2018, L1V30368969105-01
8.6 Auxiliary switches and auxiliary switch modules
Accessories
65