2 layers56 × 20 mm

The 56050C is a current Sense Transformer made by Murata in a 插件-3P,16.8x8.9mm package with 5 pins. 10A 20kHz~200kHz 50:1 插件-3P,16.8x8.9mm Current Sense Transformers ROHS.
JLCPCB lists it (part C5513650). 1 open-source board in 1 repository on GitHub use it.
The library has no symbol for this part yet.
The library has no footprint for this part yet.

插件-3P,16.8x8.9mm, with 5 pins.
Murata publishes it: the Datasheet link on this page opens it.
JLCPCB lists it as part C5513650, with 0 in stock; the sellers' links on this page open their listings.
1 board in 1 repository on GitHub; the most starred are listed on this page, with their KiCad files.