The KR2402A-1 module also reduces low voltages such as 5V

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Hello community

I'm working with a 433MHz dual-relay RF module, model KR2402A-1, quite common in wireless remote control projects. The module is activated via remote control (433MHz) and has two mechanical relays to switch loads. So far, so good.

The manufacturer indicates that the module's power supply is 5V to 50V DC, but I have serious doubts about connecting it directly to 48V DC. I know it includes a circuit to reduce the buck voltage, but if I connect 5V, will it reduce the voltage to 5V or maintain it?

Btw, I looked for the datasheet, but there's very little information.

Has anyone measured the regulator's output or tested this module with direct 5V?
Is it really safe to use it at the high end of the range (48V)?
Do you have any pictures or clear references of what regulator it uses?

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The parts in the red square look like a common 500mA buck converter.
It's not uncommon for them to have a 50volt range, like this one (65volt).
The 50volt limitation might be the voltage rating on the input cap.
Just connect it to 48 volt, and return it when it blows up.
Leo..

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