Britech A421 Electronic Thermostat with Remote Bulb

January 3, 2025

The A421 series of controls are single stage, electronic temperature controls with a single-pole, double-throw (SPDT) output relay. The controls feature an adjustable backlit LCD for viewing the temperature and status of other functions, and a three-button touchpad for setup and adjustment. A421 controls are rated for 120/240VAC.

The A421 controls provide heating or cooling control, sensor offset, temperature setback, adjustable anti-short cycle delay, and a restricted user adjustment mode. The temperature units can be displayed in °C or °F.

The A421 controls are available in NEMA Type 1 (IP20) enclosures suitable for surface or DIN rail mounting and NEMA Type 4X (IP66) that is watertight and corrosion-resistant.

A421 Temperature Control Applications Include:

• Temperature monitoring and alarming
• On/off control of snow/ice melt systems
• Heating and cooling control
• Control based on water temperature
• Mixed air temperature control

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