Ouellet Electric Heating Solid State Relay, Series: RC840 Series, 120 V, 22 A, 24 V Coil, Wire Terminal, Box Mount, 3.23 in Overall Width, 1.42 in Overall Depth, 2.19 in Overall Height, For Use With: 3-Wire, 2-Wire Mechanical, Battery Operated Thermostats, Additional Information: -4 to 140 deg F Operating Temperature Not recommended for fast-cycling modulated regulation (less than six cycles/hr) For fast-cycling heating equipment, we recommend the RT850 or RT850T (integrated 24 V transformer) solid state relay 12 AWG terminal wire size SPECIFICATIONS Additional Information : -4 to 140 deg F Operating Temperature Amperage Rating : 22 A Coil Voltage : 24 V Mounting Type : Box Overall Depth : 1.42 in Overall Height : 2.19 in Overall Width : 3.23 in Series : RC840 Series Suitable For Use With : 3-Wire, 2-Wire Mechanical, Battery Operated Thermostats Terminal Type : Wire Voltage Rating : 120 V