Hammond's 166 series transformers are designed for economical single primary applications, commonly used in low voltage filament circuits. These transformers feature an open style, channel bracket, and two-hole chassis mount, ensuring easy integration into various systems. The dual bobbin design eliminates the need for electrostatic shielding, contributing to efficient operation. With Class B insulation and UL listing, these transformers offer reliable performance and safety for a wide range of industrial and commercial applications.