I cannot find a catalog with specifications for the following DC-to DC modules: UWR-30376 (5 PINS), UWR-30377 (4 PINS) AND UWR-30378 (4 PINS). Any information is appreciated, thank you all.

 

DATEL was owned by muRata

UWR is 4-pin (unipolar output)
BWR is 5-pin (bipolar output)

Look up muRata UWR and BWR datasheets. You can apply a DC voltage on the input and raise it gradually. Monitor the DC output(s).
https://www.murata.com/products/productdata/8807040712734/uwr15wa-series.pdf
https://www.murata.com/products/productdata/8807024820254/bwr15-17w.pdf

See this for the input pins.
Pin-1 = + Input
Pin-2 = - Input
https://peshkin.mech.northwestern.edu/datasheets/Power_devices/DCDC_Datel_BWR.pdf