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Review on πŸ”Œ Aprilaire 4010 Transformer - Reliable Power Supply for Optimal Performance by Bryan Covington

Revainrating 5 out of 5

Ideal for powering thermostats where a 'C' wire is not present

This transformer is well suited for powering thermostats in situations where a 'C' wire is not present at the thermostat location . You can mount it in a single switch box in the wall (must be metal); I made a clamp to hold it securely in the box. Then apply 110 VAC from a nearby outlet to the thermostat box on the primary side of the transformer; Apply 24 VAC from the secondary of the transformer to the thermostat (all wires inside the wall). Works like a champ.

Pros
  • Rugged construction
Cons
  • Without circuit breaker