Fetching details from the dictionary...

to succeed; to relieve; to replace
to take the place of; to substitute for; to take over for; to represent; to hand over (telephone)
to be exchanged; to change (places with); to switch
担当者が換わって対応が変わった。
The person in charge changed and the response changed.
電話で話す人が換わるまで待った。
I waited until the person on the phone switched.
先生が換わると授業の雰囲気も変わる。
When the teacher changes, the class atmosphere changes too.