3KC3 and 3KC6 transfer switching equipment3KC3 and 3KC6 transfer switching equipment
Auxiliary switches
Auxiliary switches with separate contacts (3KC9603-1) or auxiliary switches with linked common contacts (3KC9603-2) can be selected depending on requirements. A maximum of two auxiliary switches may be connected to the transfer switching equipment irrespective of the type (3KC9603-1 or 3KC9603-2). The connection and installation of an auxiliary switch are described in the section titled Mounting and connecting auxiliary switches.
The switching behavior and the properties of an auxiliary switch are described in the table below:
Type |
Pin |
Contact status |
Description |
Properties |
Recommended cable cross-section |
Auxiliary switches with separate contacts (3KC9603-1) |
11/12/14 |
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Changeover contact for switch position I |
250 V AC 2 A AC‑13 24 V DC 2 A DC‑13 |
0.5 … 2.5 mm² (solid) 0.5 … 1.5 mm² (stranded) |
21/22/24 |
Changeover contact for switch position II |
250 V AC 2 A AC‑13 24 V DC 2 A DC‑13 |
|||
01/02/04 |
Changeover contact for switch position 0 |
250 V AC 2 A AC‑13 24 V DC 2A DC‑13 |
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Auxiliary switches with linked common contacts (3KC9603-2) |
11/12/14 |
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Changeover contact for switch position I |
250 V AC 2 A AC‑13 24 V DC 2 A DC‑13 |
|
21/22/24 |
Changeover contact for switch position II |
250 V AC 2 A AC‑13 24 V DC 2 A DC‑13 |
|||
01/02/04 |
Changeover contact for switch position 0 |
250 V AC 2 A AC‑13 24 V DC 2 A DC‑13 |
The switching behavior of an auxiliary switch is shown in the figure below.

NOTE
Auxiliary switch 3KC9603-2 only: Pin 21 of the auxiliary switch with linked common contacts is rated for a current of 6 A. The pin therefore has three times the carrying capacity and is therefore capable of carrying the current for all three changeover contacts.
The capacity of each pin in the case of an auxiliary switch with separate contacts is 2 A.