Resideo AT150F1030/U Plate or Panel Mounted 208/277/480 V AC Transformer with 9 in Leadwires

Item #: HONE-AT150F1030/U
Mfr. part #: AT150F1030/U
UPC: 085267151122

$63.36

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Shipping weight: 2.2 lb
Box size: 5.3 × 4.15 × 3.2 in

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Brand	Resideo
Manufacturer part #	AT150F1030/U
Frequency	60 Hz
Electrical Ratings	Primary voltage--208 Vac, 277 Vac, 480 Vac; Secondary voltage--27.5 V.O.C.
Mounting	Includes 1/2 14 NPSM conduit connector and lock nut for mounting on plate or panel (not included) with 7/8 in. knockout, and feet for surface mount.
Includes	Button for manually resetting the circuit breaker and metal end bells.
Dimensions	3 3/16 in. high x 2 3/16 in. wide x 3 5/8 in. deep
UL	UL Listed: File no. E14881, Guide no. XOKV.
CSA	Certified: File No. LR95329-18
Temperature Range (F)	-20 F to +105 F
Electrical Connections (Primary)(in.)	9 in. leadwires
Electrical Connections (Secondary)(in.)	9 in. leadwires
Electrical Ratings, Output	24 Vac at 50 VA
UPC	085267151122

The AT150F1030 is a control transformer from Resideo (Honeywell Home), 150 VA, 208/277/480 V primary, plate / panel mount.

Almost every heating and cooling control runs on 24 volts, and the transformer is what makes it. It takes line voltage in and delivers the low-voltage supply that the thermostat, the zone valves, the relays and the gas valve all share.

Size it by VA, not by voltage. VA is the load the transformer can carry, and every device on the control circuit adds to it — a zone valve pulls current while it drives, a relay coil holds current the whole time it is energized, and a Wi-Fi thermostat draws continuously. A transformer sized for the original equipment will not carry the same system after two zones and a smart stat have been added, and the symptom is intermittent: things work alone and fail together.

The multi-tap primary (208/277/480 V) lets one part number serve equipment on different supply voltages — useful on a service truck and useful in a building where not every unit runs on the same supply.

Mounting matters more than it looks. The transformer has to land where the enclosure has room and where the leads reach, and a foot-mount body will not sit in a knockout that was made for a plate mount.

Leadwires are 9 inches.