The 40 VA transformers by Resideo power 24V systems including thermostats, gas valves, and relays. They feature override protection and color-coded lead wires for primary connections. Energy limiting, they meet NEMA standard DC20-1992 and have type D enclosure. They meet NEC Class 2 not wet, Class 3 wet, and UL 1585 requirements
Honeywell / Resideo 40 VA transformers power 24V systems including thermostats, gas valves and relays.
Color-coded lead wires for primary connections
Energy limiting and meets NEMA Standard DC20-1992
Transformers are marked NEMA Type D enclosure
Meets NEC Class 2 not wet, Class 3 wet and UL 1585 requirements
Resideo offers NEMA — National Electrical Manufacturers Association — standard DC20-1992 and general purpose transformers. These transformers are available with single or multiple input voltages and with foot, conduit and plate mounting options. Transformers with circuit breakers that can be manually reset by pressing a button are also available. Resideo also designs transformers for specific environmental requirements and with specialized termination options. NEMA-compliant transformers prevent overcooling, brownout, and burnout.
3 7/32 in. high x 2 7/32 in. wide x 3 1/16 in. deep
81.8 mm high x 56.4 mm wide x 77.8 mm deep
Electrical Ratings, Output
24 Vac at 40 VA
Temperature Range (C)
-29 C to +41 C
Temperature Range (F)
-20 F to +105 F
Are you a Pro?
Connect with a Pro representative for professional pricing and benefits!