В отделе кадров уже получили моё заявление.

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Breakdown of В отделе кадров уже получили моё заявление.

• в: in
• уже: already
• отдел: the department

Questions & Answers about В отделе кадров уже получили моё заявление.

Why is it в отделе кадров, not в отдел кадров?

Because в отделе кадров means in the HR department, describing a location.

After в, Russian can use:

• prepositional case for location: в отделе = in the department
• accusative case for motion into somewhere: в отдел = into the department

So:

• В отделе кадров уже получили моё заявление = They have already received my application in the HR department
• Я пошёл в отдел кадров = I went to the HR department

Here the sentence is about where the receiving happened, not movement, so отделе is correct.

Why is it кадров? What case is that?