A toroidal transformer is a type of electrical transformer constructed with a torus or donut-shaped core, widely used in isolation equipment for the medical industry, industrial control equipment, and automotive electronics. These transformers feature a magnetic circuit completed through the toroidal magnetic core, where magnetic field lines are mainly transmitted through the closed loop of the core. Because the field lines are almost entirely concentrated in the magnetic core, toroidal transformers have relatively little magnetic leakage, which improves efficiency and reduces energy loss. The core is made from high magnetic flux material with a unique edge chamfer design, providing excellent magnetic permeability that effectively conducts magnetic flux and reduces energy loss. The windings consist of insulated copper wire manufactured with high-strength properties and double-layer varnish technology, ensuring durability in harsh environments and heavy load conditions while providing protection against attacking chemicals. Polymer PET film insulation maintains stability and structural integrity under extreme temperature conditions, effectively blocking the conduction of current and electromagnetic waves to ensure safe circuit operation. Mylar tape provides additional insulation and protection, maintaining excellent adhesion and flexibility in high temperature environments. Toroidal transformers demonstrate significant advantages over traditional square transformers, with magnetic leakage decreasing by 80% and energy loss reduced by 40%. They also last twice as long as switching power supplies and reduce high frequency electromagnetic interference to zero. These transformers are available in power capacities ranging from 50 VA to 5000 VA, with primary voltages customizable from 0 to 690V and secondary voltages from 0V to 690V, operating at standard frequencies of 50Hz or 60Hz. The secondary current ranges from 3A to 200A depending on the specific configuration. Standard models feature dual 117V primaries and dual secondaries ranging from 12V to 120V, with customization options available for specific voltage requirements, higher output requirements, 4 kV isolation between primary and secondary windings, special wire terminations or harnesses, custom mounting, special enclosures, and maximum enclosure leakage current specifications. When used under standard operating conditions, toroidal transformers can extend their service life to several decades, making them a reliable choice for critical applications requiring long-term stability and performance.