Rheem 47-25350-01 Furnace Auto Reset Limit Switch L190-20F, SPST, N.C. SPST N/C A/R Limit (190 Open 170 Close) Specifications:  Maximum Current Rating (A): 15/10 Open Temperature: 190F Tolerance Open Temperature (F): +/-5 Close Temperature: 170F Tolerance Close Temperature (F): +/-7 Disc Face: Enclosed Mounting Insertion Depth: 3" max