Resideo AT88A1005 Transformer
The Resideo AT88A1005 is a heavy-duty, foot-mounted HVAC control transformer designed to deliver reliable 24V power to high-demand commercial and residential systems. Engineered as a 75VA transformer, this unit effectively steps down 120V primary voltage to a stable 26.5V secondary output, providing the extra capacity needed for complex multi-stage systems or zones. The internally fused secondary provides critical overload protection, preventing catastrophic failure of downstream controllers or thermostats during a short circuit. For contractors, the foot-mount design ensures a secure installation on flat surfaces or junction boxes, while the 12-inch color-coded leadwires simplify wiring in tight cabinets. Whether you are replacing a burnt-out Honeywell Home transformer or upgrading a system with high-amperage contactors, the AT88A1005 offers the thermal stability and Class 2 rated performance required for consistent operation in demanding environmental conditions.
- High VA Rating: The 75VA capacity supports modern communication thermostats and multiple zone valves without voltage drops.
- Integrated Safety: Features an internal fuse on the secondary side to isolate faults and protect expensive control boards.
- Standardized Mounting: The foot-mounted foot-print allows for universal fitment in most air handlers and furnaces.
- Durable Construction: Built to withstand high ambient temperatures typical of mechanical rooms and attic installations.
Common Questions
Can I use an AT88A1005 to replace a 40VA transformer?
Yes, as long as the primary and secondary voltages match. The 75VA rating means this transformer can handle more load, making it a robust upgrade for systems where 40VA units frequently fail.
What does the internal fuse protect against?
The internally fused secondary prevents the transformer from overheating and burning out if there is a short in the 24V control circuit, though it should be noted the fuse is not user-replaceable.
Is this transformer suitable for 208V or 240V lines?
No, this specific model is a 120V primary transformer. Connecting it to a higher voltage source will damage the unit and connected equipment.
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.
Original: $152.86
-65%$152.86
$53.50Resideo AT88A1005 Transformer
The Resideo AT88A1005 is a heavy-duty, foot-mounted HVAC control transformer designed to deliver reliable 24V power to high-demand commercial and residential systems. Engineered as a 75VA transformer, this unit effectively steps down 120V primary voltage to a stable 26.5V secondary output, providing the extra capacity needed for complex multi-stage systems or zones. The internally fused secondary provides critical overload protection, preventing catastrophic failure of downstream controllers or thermostats during a short circuit. For contractors, the foot-mount design ensures a secure installation on flat surfaces or junction boxes, while the 12-inch color-coded leadwires simplify wiring in tight cabinets. Whether you are replacing a burnt-out Honeywell Home transformer or upgrading a system with high-amperage contactors, the AT88A1005 offers the thermal stability and Class 2 rated performance required for consistent operation in demanding environmental conditions.
- High VA Rating: The 75VA capacity supports modern communication thermostats and multiple zone valves without voltage drops.
- Integrated Safety: Features an internal fuse on the secondary side to isolate faults and protect expensive control boards.
- Standardized Mounting: The foot-mounted foot-print allows for universal fitment in most air handlers and furnaces.
- Durable Construction: Built to withstand high ambient temperatures typical of mechanical rooms and attic installations.
Common Questions
Can I use an AT88A1005 to replace a 40VA transformer?
Yes, as long as the primary and secondary voltages match. The 75VA rating means this transformer can handle more load, making it a robust upgrade for systems where 40VA units frequently fail.
What does the internal fuse protect against?
The internally fused secondary prevents the transformer from overheating and burning out if there is a short in the 24V control circuit, though it should be noted the fuse is not user-replaceable.
Is this transformer suitable for 208V or 240V lines?
No, this specific model is a 120V primary transformer. Connecting it to a higher voltage source will damage the unit and connected equipment.
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.
Product Information
Product Information
Shipping & Returns
Shipping & Returns
Description
The Resideo AT88A1005 is a heavy-duty, foot-mounted HVAC control transformer designed to deliver reliable 24V power to high-demand commercial and residential systems. Engineered as a 75VA transformer, this unit effectively steps down 120V primary voltage to a stable 26.5V secondary output, providing the extra capacity needed for complex multi-stage systems or zones. The internally fused secondary provides critical overload protection, preventing catastrophic failure of downstream controllers or thermostats during a short circuit. For contractors, the foot-mount design ensures a secure installation on flat surfaces or junction boxes, while the 12-inch color-coded leadwires simplify wiring in tight cabinets. Whether you are replacing a burnt-out Honeywell Home transformer or upgrading a system with high-amperage contactors, the AT88A1005 offers the thermal stability and Class 2 rated performance required for consistent operation in demanding environmental conditions.
- High VA Rating: The 75VA capacity supports modern communication thermostats and multiple zone valves without voltage drops.
- Integrated Safety: Features an internal fuse on the secondary side to isolate faults and protect expensive control boards.
- Standardized Mounting: The foot-mounted foot-print allows for universal fitment in most air handlers and furnaces.
- Durable Construction: Built to withstand high ambient temperatures typical of mechanical rooms and attic installations.
Common Questions
Can I use an AT88A1005 to replace a 40VA transformer?
Yes, as long as the primary and secondary voltages match. The 75VA rating means this transformer can handle more load, making it a robust upgrade for systems where 40VA units frequently fail.
What does the internal fuse protect against?
The internally fused secondary prevents the transformer from overheating and burning out if there is a short in the 24V control circuit, though it should be noted the fuse is not user-replaceable.
Is this transformer suitable for 208V or 240V lines?
No, this specific model is a 120V primary transformer. Connecting it to a higher voltage source will damage the unit and connected equipment.
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.
