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JOHNSON CONTROLSSingle-Stage Electronic Temperature Controls

JOHNSON CONTROLS Temperature Control: Single Stages, Heat or Cool, -40°F to 212°F, Digital

The JOHNSON CONTROLS A421ABC-02 is a single-stage electronic temperature control for temperature sensing and control applications. It operates with a 240V AC input voltage and features a digital display with a…

SKU 3G-OTH-68439

Also listed as: A421ABC02 · A421ABC 02

Brand
JOHNSON CONTROLS
Item
Temperature Control: Single Stages, Heat or Cool, -40°F to 212°F, Digital
Category
Single-Stage Electronic Temperature Controls
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Worldwide DHL shipping from Singapore; 7–14 business days door-to-door for most destinations.
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Invoicing in USD. Bank transfer (SWIFT) and corporate PO accepted.

Technical Specifications

JOHNSON CONTROLS
Manufacturer Part Number
A421ABC-02
Type
Heat or Cool, -40°F to 212°F, Digital, 1, SPDT
AC/240V AC
120V
Application
Temperature Sensing and Control
Product Type
Temperature Control
Input Voltage
240V AC
Variable Output Voltage
No

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JOHNSON CONTROLS Products
3G Electric (S) Pte. Ltd. — Singapore

Product Description

The JOHNSON CONTROLS A421ABC-02 is a single-stage electronic temperature control for temperature sensing and control applications. It operates with a 240V AC input voltage and features a digital display with a temperature range of -40°F to 212°F. This SPDT control supports heat or cool modes and does not provide variable output voltage.

Frequently Asked Questions

What is the JOHNSON CONTROLS A421ABC-02 temperature control used for?

The JOHNSON CONTROLS A421ABC-02 is a single-stage electronic temperature control used for temperature sensing and control in HVAC and refrigeration systems. It operates in heat or cool mode with a digital display, covering a range of -40°F to 212°F, and is suitable for commercial and industrial applications.

What are the specifications of the JOHNSON CONTROLS A421ABC-02?

The JOHNSON CONTROLS A421ABC-02 is a single-stage SPDT temperature control with an input voltage of 240V AC (also rated 120V AC). It has a digital display, a temperature range of -40°F to 212°F, and supports heat or cool modes. Variable output voltage is not provided.

Where to buy the JOHNSON CONTROLS A421ABC-02 worldwide?

You can source the JOHNSON CONTROLS A421ABC-02 worldwide through 3G Electric, a global industrial equipment distributor. We handle full logistics, customs clearance, and delivery to your location. Contact us for availability and lead time.

How to install the JOHNSON CONTROLS A421ABC-02 temperature control?

Install the JOHNSON CONTROLS A421ABC-02 by mounting it in a dry location, wiring the SPDT contacts per the load and power supply (120V AC or 240V AC), and setting the desired temperature via the digital interface. Always follow local electrical codes and the manufacturer's manual for safe operation.

Used in

Common applications for JOHNSON CONTROLS
Industrial refrigeration — Johnson Controls P170SA-1C dual pressure control for compressor protection in ammonia or halocarbon systems
Chiller plant automation — Johnson Controls VA7810-HGA-2 electric globe valve actuator for modulating chilled water flow in VG7000 series valves
Pneumatic HVAC retrofit — Johnson Controls T-4002-302 conversion kit for upgrading existing Robertshaw thermostats in commercial buildings
Cooling tower water management — Johnson Controls V-4332-1007 pneumatically actuated diaphragm valve for 3-way diverting of water flow
Boiler fuel oil pressure monitoring — Johnson Controls P545NCB-25C electronic lube oil pressure control with alarm for burner management systems
Process pressure sensing — Johnson Controls P599AAPS105C pressure transmitter with IP67 rating for washdown zones in food and beverage plants

JOHNSON CONTROLS Products

3G Electric supplies JOHNSON CONTROLS single-stage electronic temperature controls. We supply genuine products with in-stock availability on common SKUs, technical documentation, commissioning support, and warranty service — worldwide.

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Cross-referenced by specification & description
JOHNSON CONTROLS
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Temperature Control: Single Stages, Heat or Cool, -40°F to 212°F, Digital, 1, SPDT, 120V AC/240V AC (MPN A421ABC-06)
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Temperature Control: Single Stages, Heat or Cool, -40°F to 212°F, Digital, 1, SPDT, 120V AC/240V AC (MPN A421ABG-02)
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Temperature Control: Single Stages, Heat or Cool, -40°F to 212°F, Digital, 1, SPDT, 24V AC (MPN A421GBF-02)
Temperature Control: Single Stages, Cool Only, -40°F to 212°F, Digital, 1, SPDT, 120V AC/240V AC (MPN A421ABT-02C)
JOHNSON CONTROLS
Temperature Control: Single Stages, Cool Only, -40°F to 212°F, Digital, 1, SPDT, 120V AC/240V AC (MPN A421ABT-02C)
Temperature Control: Single Stages, Heat and Cool, -40°F to 212°F, Digital, 1, SPDT, 120V AC/240V AC (MPN A421ABD-02C)
JOHNSON CONTROLS
Temperature Control: Single Stages, Heat and Cool, -40°F to 212°F, Digital, 1, SPDT, 120V AC/240V AC (MPN A421ABD-02C)
Temperature Control: Single Stages, Heat and Cool, -40°F to 212°F, Digital, 1, SPDT, 120V AC/240V AC (MPN A421ABC-02C)
JOHNSON CONTROLS
Temperature Control: Single Stages, Heat and Cool, -40°F to 212°F, Digital, 1, SPDT, 120V AC/240V AC (MPN A421ABC-02C)

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Temperature Control: Single Stages, Heat and Cool, -40°F to 212°F, Digital, 1, SPDT, 120V AC/240V AC (MPN A421ABC-06C)
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Temperature Control: Single Stages, Heat and Cool, -40°F to 212°F, Digital, 1, SPDT, 120V AC/240V AC (MPN A421ABC-03C)
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Temperature Control: Single Stages, Heat and Cool, -40°F to 212°F, Digital, 1, SPDT, 120V AC/240V AC (MPN A421ABC-03C)
Temperature Control: Single Stages, Heat and Cool, -40°F to 212°F, Digital, 4X, SPDT, A99 (MPN A421AED-01C)
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