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In the datasheet of R1SE DC-DC family I read:

Short Circuit Protection (SCP) below 100 mΩ 1 second

What does it mean? After 1 second of short-circuit the device will burn? What kind of "protection" is this?

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    \$\begingroup\$ Gives enough time for the fuse to blow. \$\endgroup\$ – DKNguyen Feb 2 at 16:48
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It may be enough to charge up a DC filter capacitor on power-up or when a device is plugged in. Remember that a discharged capacitor appears like a short-circuit initially.

There's only so much you can fit into the tiny form factor. You can get a DC/DC converter that will survive a short-circuit for longer but it will probably be bigger.

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