Johnson Controls A421ABC-03C Electronic Temperature Control

The Johnson Controls A421ABC-03C Electronic Temperature Control delivers precise, reliable regulation for commercial HVAC and refrigeration systems. Built for quiet, accurate performance, this unit provides a compact solution where space and dependability matter.

Designed for 1-stage refrigeration and HVAC applications, it supports a 9 ft 9 in cable, a 120/240 VAC contact rating, and a rugged NEMA 1 enclosure for indoor environments. The controls are versatile with mounting on a DIN rail or surface, making installation straightforward in panel layouts. Includes the A99BB-300C Temperature Sensor for fast, accurate sensing in tight spaces. Durable, tested for long life, and compatible with common refrigeration control schemes. Designed for energy-efficient operation with stable performance across a broad temperature range.

Ideal for panel installations in warehouses, labs, and service bays, this electronic temperature control delivers dependable response, easy configuration, and durable performance in demanding conditions.

• Primary feature: Electronic Temperature Control
• Cable length: 9 ft 9 in
• Electrical rating: 120/240 VAC
• Enclosure: NEMA 1
• Applications: 1-stage refrigeration, HVAC
• Mounting: DIN rail and surface
• Includes: A99BB-300C Temperature Sensor