I've successfully installed my Ring Door Bell Pro yesterday.
Ring Door Bell Pro integrates with an existing door chime. I used a voltmeter and confirmed the transformer's output voltage is 19 V AC.
Due to the Ring Door Bell Pro size, my installation at the entrance door exposes two wires going to the unit. The wires are safe; however, someone can pull them hard and they can short. I tested and when I short the wires, they spark.
I am thinking to add a fuse right after the transformer. this way, if I am not at home, and any short circuit happens by an intruder, there is no risk of fire in my basement where the transformer is.
What is the proper fuse model, type, number ar amp for such application? It would be nice if I can buy it from HomeDepot