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Mechanical Thermostat

A28 Series - US Product Line

Two-Stage Temperature Control

Controls are compact with fixed differential per stage and (on most models) adjustable differential between stages. Liquid filled element provides wide range, constant differential over whole range and no influence from barometric pressure. Since the bulb contains the major portion of the total fill the thermostat may by considered as cross-ambient, capillary and cup temperature variations affect the operating point only slightly due to the small amount of fill they contain. For quantity orders it is possible to have the below stated optional constructions: - Without case and cover for panel mounting - Close differential per stage - Different capillary lengths All standard IP30 enclosure models have a universal way of adjustment. For this purpose a knob and sealing cap are enclosed.


  • Wide temperature ranges available
  • Constant differential throughout the entire range
  • Single-pole, double-throw (SPDT) snap-acting switches
  • Unaffected by changes in barometric pressure
  • Unaffected by cross ambient conditions
  • Compact enclosure
  • Variety of sensing element styles

Products List1 items

Product CodeRangeDifferentialSwitch Action
-7 to27 °C2 each stage, 2 to 7 adjustable between stages.Two- SPDT