Strap On Hot Water Control Circulator High-Limit Low-Limit Switch Type SPDT Switch Action Open/Close on Temp Rise Height (In.) 4 1/16 in Width (In.) 3 3/4 in Depth (In.) 2 5/16 in Contact Rating @ 120V (A) 7.4 A Contact Rating @ 240V (A) 3.7 A Differential (Deg. F) 10 Degrees F Temp Setting Range (F) 100 to 240 Mounting Surface Mount (Strap-On)