According to the company, the AHR series of transformers are designed for, but not limited to, the HVAC/R industry, and have UL1585 Class 2 approval. The transformers are used to step down various voltages for appliance use. Common applications include control circuits for furnaces, heat pumps, refrigerators, and air-conditioners. The transformers utilize a UL-approved Class B electrical insulation system, which is said to ensure safe operation. The transformers are energy limited, so no secondary fusing is required.