What type of transformer has no direct electrical connection between the primary and secondary windings?

An isolation transformer is designed specifically to provide electrical isolation between its primary and secondary windings. This means that there is no direct electrical connection, which enhances safety by preventing electrical shocks and reducing the risk of ground loops. The physical separation between the windings allows for the transfer of energy through magnetic coupling only, which aids in protecting sensitive equipment from electrical noise and transients.

Isolation transformers are crucial in applications where sensitive equipment is involved, such as in medical devices or audio systems, ensuring that the primary and secondary circuits maintain different ground potentials. This design principle is fundamental in many electrical applications to provide secure and noise-free operation, making it essential knowledge for electrical contractors.

In contrast, autotransformers, step-up transformers, and step-down transformers involve direct connections between the windings, which do not provide the same level of electrical isolation.