ERC: "Pins of type power output and open collector are connected"

Schematic
1

Hello.

Here is a simple circuit with a NPN transistor acting as a high side switch:

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But it triggers an ERC error:

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“Pins of type power output and open collector are connected”

Why the ERC error occurs? How to solve it?

Thanks!

2

Show us the symbol properties of Q1.

3

Almost all pins of BJT are defined as “passive” in KiCad’s libraries, because KiCad can not know in advance how you are going to use your transistor. I guess you used the Simulation_SPICE:NPN transistor. That is one of the very few that has it’s pins defined as other then “passive”, and that is probably an error in KiCad’s libraries.

4

Indeed, I accidentally used Simulation_SPICE:NPN symbol, that has “Open collector” and “Open emitter” instead of “Passive” pin functions. After changing the symbol to a general Q_NPN_BCE or similar the problem was gone.
Thanks!

5

This is not high side switch. For switch from +12V high side you should get +12V at switch output but you will not get it in this circuit.