Functions of the control inputs of the 3KC3 transfer switching equipment

The 3KC3 transfer switching equipment has three control inputs (pins 313  315). Pin 317 is used as the common control terminal for the control inputs.

Pin 313 - O: Command for switching to position 0

Closing of this contact has the result that the transfer switching equipment is switched to the 0 position. Before this command can be activated, pin 313 must be closed with pin 317 and the following conditions must be fulfilled:

  • The cover is closed and

  • Pins 314 and 315 are not connected with pin 317, as the switching commands for the switch to position I and position II have a higher priority than the switching command for position 0.

In addition, continuous closure of pins 313 and pin 317 results in the selection of continuous operation logic. If these pins are not closed, impulse logic is selected.

Pin 314 - II: Command for switch to position II

Closing of this contact has the result that the transfer switching equipment is switched to the II position. This command is activated if the following requirements are met:

  • The cover is closed and

  • Contacts 314 and 317 are closed and

  • Contact 315 is not closed with 317 at the same time.

Pin 315 - I: Command for switch to position I

Closing of this contact has the result that the transfer switching equipment is switched to the I position. This command is activated if the following requirements are met:

  • The cover is closed and

  • Contacts 315 and 317 are closed and

  • Contact 314 is not closed with 317 at the same time.

Pin 317- C: Control terminal for inputs 313 – 315

Input 317 is used as the common control terminal for inputs 313 – 315.