Big Mosfet Switch Shorting!

Robotics and electronics discussion Electronics
1

Hi,

I’m using the Pololu - Big MOSFET Slide Switch with Reverse Voltage Protection, HP Big Power Switch for my Robot.
Today I resoldered the connections to it, and before plugging power in, I measured the resistance accros all power rails, everything was fine. But 10 minutes after flipping the switch on, therefore applying power to my robot, I saw smoke coming from the robot. I quickly turned power off and removed all connections. I worked my way back and discovered, the Big Power Switch connected VOUT and GND together when enabled! I could reproduce this, even when nothing else was connected to the switch other than the VIN and GND(from my batteries). Does anyone have an Idea why this is? Could it be, that I destroyed the MOSFETs when soldering?

PXL_20260220_193701907
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PXL_20260220_193721345
PXL_20260220_1937213451920×2557 241 KB

Greetings from Germany,
Fazeli24

2

Hey, it turns out I’m just too tired and stupid haha. Measuring the resistance while the circuit is on obviously doesn’t work… It was two cables, and the insulation between them broke, causing a short.