@Phaedrux OK thanks for all

Thank you for clarification, I was concerned that I've overstressed capacitors which would lead to nasty failure.
Now I am relived 🙂

Kind Regards,

@jaad According to this https://duet3d.dozuki.com/Wiki/Duet_3_Mainboard_6HC_Hardware_Overview, the output is rated at 18 Amps.

Here is an extract from that link

Note that the board is rated to 18A on the bed heater channel; however it is supplied with a 15A fuse fitted (18A are difficult to source). If you need 18A on the bed heater channel then you need to fit a 20A fuse and take further precautions against over-current.

Edit. So the safe thing to do would be to use an SSR.

ah i thought about the fan ducts and not about the heat creap, yeah that could be not so nice....

haha I wish.

They are a tad noisy!