Combination Protectorelay and Hydronic Heating Controller, 120Vac, 45 Second Safety Switch Timing, 130-240 Degree High Limit Operating Range, 110-220 Degree Low Limit Operating Range, 10 Degree Fixed High Limit Differential, 10-25 Degree Adjustable Low Limit or Circulator, 1 1/2" Insulation Depth, Horizontal Mount, 4.4 Amp @ 120Vac Full Load Electrical Rating, 26.4 Amp @ 120Vac Locked Rotar Electrical Rating, Includes Auxiliary ZC and ZR Terminals that may be used to provide Circulator Zone Control through an R845A, Also Includes Heat Conductive Compound and Vertical Case