Hammond's 166 series transformers are economical, single-primary designs suitable for a wide range of low-voltage filament applications. These transformers feature an open-style, channel bracket, two-hole chassis mount, and minimum 6-inch long leads for easy integration. The dual bobbin design eliminates the need for electrostatic shielding, contributing to their efficiency and reliability. Constructed with Class B insulation (130 degrees C) and UL listed as a Class A (105 degree C) design, these transformers offer robust protection and performance. They undergo a hi-pot test of 2,000V RMS and are CSA certified, ensuring quality and safety.