Hammond's 166 series transformers are designed for economical single primary applications. These transformers feature an open style, channel bracket, and two-hole chassis mount, with minimum 6" long leads. The dual bobbin design eliminates the need for electrostatic shielding. They are commonly used in various industrial and consumer electronics applications where a compact and efficient transformer is required. The 166J25 model specifically offers a 2.5 VA capacity with a 115V primary and 2.5 C.T. secondary, making it suitable for a range of power needs.