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Resideo AT140A1018 Transformer

Resideo AT140A1018 Transformer

Resideo

The Resideo AT140A1018 Transformer is a heavy-duty 40VA power solution designed for high-demand 24Vac circuits in residential and commercial HVAC systems. This multi-tap HVAC transformer features flexible primary voltage inputs of 120V, 208V, and 240V, converting power to a stable 27V secondary output. Engineered for versatility, it supports foot mounting, plate mounting on 2"x4" or 4"x4" outlet boxes, and clamp mounting via knockouts. As a Class 2 transformer, it meets strict UL 1585 and CSA standards, ensuring safety for controllers, sensors, and zone valves. The AT140A1018 serves as a direct, ruggedized replacement for the 50363 model, featuring metal end bells for superior core protection in tough mechanical environments. Professional-grade color-coded leads for the primary and secure screw terminals for the secondary streamline field wiring and system diagnostics.

Key Benefits for Technicians:

  • Universal Voltage Integration: Multi-tap design handles 120V, 208V, or 240V primary inputs, reducing the need to carry multiple single-voltage units on the truck.
  • Flexible Mounting Footprint: Supports universal mounting configurations including foot, plate, panel, or outlet box knockout installations.
  • Industrial-Grade Protection: Integrated metal end bells shield internal windings from physical damage and environmental debris.
  • NEC Class 2 Compliance: UL Listed and CSA Certified for safe use in non-wet Class 2 and wet Class 3 control circuit applications.
  • High Compatibility: Efficiently powers 24V thermostats, hydronic zone valves, and building automation controllers requiring up to 40VA.

Common Questions:

Can I use this to replace a 24V secondary transformer?
Yes. While the secondary is rated at 27V open circuit (V.O.C.), it provides the standard 24Vac power required for most HVAC control systems under load.

Does this unit include a mounting plate?
Yes, the Resideo AT140A1018 includes an iridescent mounting plate and feet, allowing for secure attachment to various electrical box sizes.

What is the maximum amperage for the 24V circuit?
At a 40VA rating, target a maximum continuous load of approximately 1.6 Amps to ensure stable voltage and prevent overheating the core.

Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.