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
Honeywell AT150F1022 - Transformer, Plate or Panel Mounted 120/208/240 Vac, 24V AC @ 50 VA - - Amazon.com
Amazon.com: Square D Control Transformer,50VA,277VAC : Electronics