Resideo AT72D1089 Transformer R-448A When swapping out an old

When swapping out an old L4008E1305 equivalent or servicing a Teledyne Laars unit

if it fails to close at 1

Extended 10' Lead: Allows for professional cable management and protection of wire connections from moisture and corrosion

and certain Grainger or Kenmore branded air cleaners

What is the difference between this and the 10SAY-04

Resideo AT72D1089 Transformer R-448A When swapping out an oldThe Resideo AT72D1089 Transformer is a professional grade solution for technicians requiring a reliable 120V to 24V step down for HVAC control circuits. Engineered with a 40VA power rating, this unit is built to manage the electrical load of 24VAC thermostats, gas valves, and multi zone relays. The hardware features a 4"x4" plate mount design and a NEMA Type D enclosure, ensuring compliance with NEC Class 2 (not wet) and Class 3 (wet) requirements.