Ever fried a dev board from a reversed power connection?

DevGuard 24 is a simple inline 3–24V protection module that blocks reverse polarity and overload before they destroy your hardware.

Plug it between your power source and your project. That’s it.

No configuration. No setup. Just protection.

Technical Specs

• Input Voltage Range: ~3 V–24 V DC

• Protection: Reverse polarity + surge clamp + resettable fuse

Fuse Options:

• 500 mA version — for small loads

• 1100 mA version — for heavier circuits

Mounting: Inline screw terminal connections

The DevGuard 24 is a simple little board that keeps your projects from getting fried when you inevitably plug something in backwards at 2am.

It's got a TVS diode, P-MOSFET, and a polyfuse - basically the holy trinity of "oops" protection. Voltages get clamped, polarity gets sorted, and if something does go wrong, the fuse trips and resets itself. No tossing burnt boards in the trash.

We've all done it. You're tired, you're deep in a build, and suddenly smoke. Power Checker is cheap insurance for those moments when your brain is already three problems ahead.

Screw terminals mean you can hook it up to pretty much whatever. Small enough to tuck anywhere.

Works with 3v-24v at 500mA or 1100mA depending on the version.