Temperature Control Relay; Voltage Rating 120 Volt AC; Minimum AC Voltage Rating (V) 120 Volt; Maximum AC Voltage Rating (V) 240 Volt; Operating Temperature 110 to 220 Deg F (Low Limit), 130 to 240 Deg F (High Limit); Humidity 0 to 95 Percent RH, Non-Condensing; Size 4-5/16" Width x 3-1/8" Depth x 6-1/8" Height; Mounting Vertical; Application Triple Aquastat Relay, Hydronic Heating System; Approval UL, CSA; Contact Rating 7.4 Amp at 120 Volt AC, 3.7 Amp at 240 Volt AC (Full Load), 44.4 Amp at 120 Volt AC, 22.2 Amp at 240 Volt AC (Locked Rotor); Differential Temperature Rating 10 Deg F Fixed (High Limit), 10 to 25 Deg F (Low Limit); Operating Pressure 200 PSI (Immersion Well); Switching Action SPST