This units can be used in any electromechanical system that requires unrestrained,continuous rotation while transferring power or data from a stationary to a rotating structure.It's also called a rotary electrical interface,commutator,collector,swivel or an electrical rotary joint.It can improve electromechanical capability,simplify system design,eliminate possible damage while rotation.It’s the key apparatus of various precision rotary worktable, electric test instrument,manufacture and process control instrument. Features: ■ 12 circuits models ■ 2 amps, 240 VDC /240 VAC per circuit ■ Precision assembly to provide exceptional rotational life ■ Speeds up to 300 rpm continuous ■ Gold-on-gold contacts ■ Mounting flange on housing ■ Flexible, color-coded, silver-plated, stranded copper lead wire ■ Superior handling of low level control signals http://www.chinaslipring.com