24VAC 50VA Wall Transformer with PTC Fuse Compatible with All Versions of Doorbell,Nest, Ecobee, Sensi and Honeywell Thermostat,Water Solftener,Screw Terminal Output - - Amazon.com
Square D 9070TF50D1 Control Transformer, 50Va, 4.43 In. H: Electronic Transformers: Amazon.com: Industrial & Scientific