These devices allow transmitting power and signals from a stationary platform to one that is rotating. A slip-ring assembly is often a graphite or precious metal brush that contacts the outside diameter of a rotating metal ring. As the ring turns, an electrical current or signal conducts through the stationary brush to the metal ring making the connection. Additional ring-brush assemblies are stacked along the rotating axis for more electrical circuits.

Electrical slip rings handle a variety of industrial applications up to 60A and 5 MW. The devices usually configure easily for power or signal connections. The signal portion is often compatible with Ethernet, Profinet, RS-232, RS-485, RS-422, CAN, as well as generic analog or digital sensing and 24V control signals. A slip ring can be used in any electromechanical system that requires unrestrained, intermittent, or continuous rotation while transmitting power, or data, or both.

Contactless sliprings, a recent development, are based on inductively coupled power transfers. Inductive-power transfer applies the principle of electromagnetic inductance. A version that works with high efficiencies uses wireless power transfer that can harmonize itself in the field. This makes the system resistant to changes in environmental conditions and load variations.

These sliprings mount at a variety of distances. Furthermore, they can transfer power through any non-metallic membrane, making mounting easier than traditional components.

Power can transmit as a single load while a built- in data-communications system switches power as necessary, to meet different device requirements off the wireless receiver. In this way, the slip rings are said to provide wireless power and data to pitch control in wind turbines, improving their efficiency by reducing the cost of maintaining and replacing existing mechanical slip rings and their carbon brushes.