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The A421 Series Electronic Temperature Controls are single-stage controls with a single-pole double-throw SPDT output relay. A421 Controls feature a bright backlit LCD with adjustable brightness and a three-button touchpad interface that can be set up to restrict user adjustments. An LED indicates the output relay’s On/Off status. Standard A421 Series control modules have simple On and Off temperature settings for heating or cooling an adjustable anti-short cycle delay temperature setback and sensor offset capability. The temperature control range is -40 to 212F or -40 to 100C. The A421 controls are available either in Type 1 NEMA IP20 CE high-impact plastic enclosures suitable for surface or DIN rail mounting or in Type 4X NEMA IP67 CE watertight corrosion resistant surface mount enclosures.Single-stage controls
Single-pole
Double-throw
The temperature control range is -40 to 212f or -40 to 100c