Resideo AT41A1012 40VA Step-Down Transformer 120V Primary 24V Secondary Channel Frame Mount

The Resideo AT41A1012 is a 40 VA step-down control transformer designed to power 24 Vac circuits in HVAC and building control systems. Housed in a durable phenolic enclosure, it steps down standard 120 Vac line voltage to a 24 Vac secondary output suitable for thermostats, gas valves, relays, and other low-voltage control devices.

This transformer features a channel frame mounting design that allows for flexible installation in direct, horizontal, or vertical orientations. The 7-inch primary leadwires and screw/quick-connect secondary terminals make wiring straightforward in a variety of panel and equipment configurations.

Key Features:

• Primary Voltage: 120 Vac
• Secondary Voltage: 24 Vac (open circuit)
• VA Rating: 40 VA
• Enclosure: Phenolic housing with 1/2 in. spud mounting
• Primary Connections: 7-inch leadwires
• Secondary Connections: Screw terminal / quick-connect
• Mounting: Channel frame — direct, horizontal, or vertical foot mounting
• Frequency: 50/60 Hz
• NEMA Rating: Type B
• Operating Temperature: -20°F to +105°F (-29°C to +41°C)
• Dimensions: 2 in. H x 2-1/4 in. W x 1-7/8 in. D
• Class 2 transformer — without fusible link or overload protection
• Alternate Part Number: AT41A1012/U

Suitable for use in heating and cooling control systems, as well as any low-voltage application that does not exceed the listed VA and voltage ratings. Manufactured by Resideo (Honeywell Home).