In case-Na wypadek gdyby

We use in case to express that we are doing something in preparation for something which might happen.

Take an umbrella in case it rains! -Weź parasol "na wypadek gdyby".....

I'll buy some more wine "in case" this bottle is not enough.-Kupię trochę więcej wina "na wypadek gdyby"


In case of W przypadku

We use in case of to say what we should do if or when something happens.

In case of fire, leave the building as quickly as possible. W przypadku pożaru opuść budynek tak szybko jak to możliwe.

(If there is a fire, leave the building)

In case of rain, take a taxi. W przypadku deszczu weź taksówkę.



http://speakspeak.com/resources/english-grammar-rules/various-grammar-rules/in-case-in-case-of
https://www.etutor.pl/szukaj/?q=case&mode=dictionary&langpair=en::pl


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