[Qusetion]: The power consumption written on the manual of RTU5034: 12V input, maximum current 50mA. Then can I use 24V, 500mA power supply?
 

[Answer]: Yes. There are two parameters involved here: 
     (1) Device power consumption - theoretically 50mA@12V 
     (2) Capacity of the power supply - 24V / 500mA. Capacity of the power supply > Device power consumption can be used.