Slip rings need continual maintenance to avoid degradation of the rotating electrical connection caused by normal wear and debris. When you replace conventional slip rings with Mercotac's no-maintenance rotating electrical connectors, you will profit from the following SUPERIOR BENEFITS: slip ring|slip rings

Increased reliability
Extremely low electrical noise
LESS than 1 milliohm resistance
Sealed ball bearing construction
Durable, compact and low cost
In stock availability
Long life
Made in U.S.A.
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MERCOTAC ROTARY ELECTRICAL CONNECTORS
operate on a superior principle.  They offer an extremely low-resistance electrical connection because the conduction path is a liquid metal which is molecularly bonded to the contacts.  The Mercotac connection is constant and unchanged for the life of the connector.
APPLICATIONS: A great variety of OEM machinery will benefit from the use of a Mercotac Connector for power and control circuits when changing from a traditional slip ring.

The company web site: http://www.chineseslipring.com