A421GEF-01 Low-Voltage Type 4X Electronic Temp Control


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  • Price for Quantity 1-4: $106.98
  • Price for Quantity 5-9: $101.84
  • Price for Quantity 10+: $97.46

Temperature Control, Electronic, 24 Vac, -40/212 Degree Temperature Control Range, Front Panel LCD, Nema 4X, Din Rail or Surface Mount, Includes Temperature Sensor with 9 7/8″ Cable

SKU: A421GEF-01 Category:


These controls are single-stage, electronic temperature controls with a Single Pole, Double Throw (SPDT)output relay. The A421 models feature bright backlit LCD with adjustable brightness and a three button touchpad interface that can be set up to restrict user adjustments.  An LCD indicates the output relay’s On/Off status.  Standard A421 Series Control models have simple On and Off 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 Used to control a wide variety of single-stage refrigeration or HVAC equipment.

Click below to view the product specification sheet and additional product information.

A421 Series Standard  Specification sheet

A421 instructions

A421 catalog page

Additional information

Weight 3 lbs

Johnson Controls


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