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The AT20, AT40, AT72, AT87 and AT88 transformers are step-down transformers used primarily for powering 24 VAC control systems. They can be used in any 24 VAC application that does not exceed the transformer volt-ampere (VA) rating.
Honeywell Home Transformer, 120 VAC, 24 VAC, 40 VA, 50/60 Hz, Foot Mount, 9 in, NEMA D Enclosure, Black, -20 to 105 deg F, 2-3/32 in H x 2-5/8 in W x 2-3/16 in D
| Color | : | Black |
| Dimensions | : | 2-3/32 in H x 2-5/8 in W x 2-3/16 in D |
| Enclosure Type | : | NEMA D |
| Frequency Rating | : | 50/60 Hz |
| Mounting Type | : | Foot |
| Primary Voltage | : | 120 VAC |
| Secondary Voltage | : | 24 VAC |
| Temperature Rating | : | -20 to 105 deg F |
| VA Rating | : | 40 VA |
| Wire Size | : | 9 in |