Compatible with 2- and 3-wire thermostat, this all-in-one relay includes a built-in 24 V transformer RC840T-347 HEAT RELAY 347V C/W TRANSFORMER
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Marketing Collateral
https://static.graybarcanada.com/Generic/honeywell/pdf/25cf5f75e31e15f715cb9ef64e35ea03a7cabe22.pdf
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Technical Documents
https://static.graybarcanada.com/Generic/honeywell/pdf/40a12adef3d2ee2767a7ab2c464b9debfab7a6b5.pdf