You will find that this unbranded relay is quiet in operation, with minimal hum or buzz during long runs.
Analog Signal Isolator 4-20mA 0-10V 0-5V 1-5V 0-20mA Ultra-Thin 1 In 2 Out
I like that this heavy duty relay seems built for real work, not just occasional hobby projects at home.
A nice touch is the heavy duty rating printed clearly, so you know it is ready for demanding circuits.