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Your cart is empty.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 212°F or -40 to 100°C. 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.
YK
Reviewed in the United States on November 27, 2023
It is easy to use, setup. Just plug and play
Customer
Reviewed in the United States on February 14, 2021
I have used this style of Johnson control for a lot of years. They have always provided great flexibility for an almost infinite range of temperature applications. Highly recommended.
Paul
Reviewed in the United States on August 26, 2020
Easy to hook up. Offers a dry contact relay. Programming is very simple.
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