![Why do some SMPS power supplies require an input voltage select switch? - Electrical Engineering Stack Exchange Why do some SMPS power supplies require an input voltage select switch? - Electrical Engineering Stack Exchange](https://i.stack.imgur.com/zWdO5.jpg)
Why do some SMPS power supplies require an input voltage select switch? - Electrical Engineering Stack Exchange
![Amazon.com: NeuPo 48 Volt Power Supply | Compatible with Select Cisco Phone Models in The 8800, 8900 (Only 8961), 9900 Series | Power Adapter Only Compatible with Cisco 8811, 8841, 8851, 8861, 8961, 9951, 9971 : Electronics Amazon.com: NeuPo 48 Volt Power Supply | Compatible with Select Cisco Phone Models in The 8800, 8900 (Only 8961), 9900 Series | Power Adapter Only Compatible with Cisco 8811, 8841, 8851, 8861, 8961, 9951, 9971 : Electronics](https://m.media-amazon.com/images/I/71qVBjbpbFL._AC_UF894,1000_QL80_.jpg)
Amazon.com: NeuPo 48 Volt Power Supply | Compatible with Select Cisco Phone Models in The 8800, 8900 (Only 8961), 9900 Series | Power Adapter Only Compatible with Cisco 8811, 8841, 8851, 8861, 8961, 9951, 9971 : Electronics
![HOW TO CHOOSE A POWER SUPPLY TO THE PLC CONTROLLER - Blog related to industrial automation - PLC, HMI, control systems HOW TO CHOOSE A POWER SUPPLY TO THE PLC CONTROLLER - Blog related to industrial automation - PLC, HMI, control systems](https://automationtop.com/wp-content/uploads/2020/05/howtochoose-a-power.jpg)