RC840T-240 On/Off Switching Electric Heating Relay with Built-in 24 V Transformer, Black

Compatible with 2- and 3-wire thermostat, this all-in-one relay includes a built-in 24 V transformer
Direct replacement for any brand name relay
Built-in 24 V transformer for easy installation.
Compatible with 24V thermostats with 2-wire connections (R,W) or 3-wire connections (R,W,C)
Immediate relay activation provides improved temperature control and comfort