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High Current Rotary Ground Clamp


Innovative Maintenance Free Rotary Ground Clamp

Tired of poor rotary ground consistency? Constantly having to grease and maintain a metal-on-metal rotary ground? Down-time and varying performance due to fluctuating resistance?

Meridian Laboratory’s full lineup of single contact, high current rotary ground clamps provide a consistent, maintenance-free contact unaffected by RPM or total number of revolutions. Contrary to conventional brushed rotary grounds, Meridian Laboratory’s MC & MCT Series are arc-free, do not have internal friction, and do not require greasing or any type of maintenance. All single contact, high current ROTOCON MC & MCT Series rotary grounds are built with environmentally sealed and corrosion proof housings to ensure a long service life without maintenance.

Suitable for all environments and applications including welding, electro-plating, cutting, and other high current industrial applications, the ROTOCON MC & MCT Series is designed to withstand 100% duty cycles in continuous manufacturing and production processes. The ROTOCON’s brush-free design eliminates all issues such as maintaining brush contact, application of conductive greases, and the elevated contact resistance associated with conventional brushed rotary grounds. With the MC Series, you will achieve a more consistent ground, with zero noise or elevated contact resistance over time and revolutions.

Unlike conventional brushed slip rings which rely on metal on metal contacts and are limited by RPM, electrically noisy, and require adjustment and maintenance for proper operation, all ROTOCONs are brushless, functioning through a molecularly bonded viscous metal film which remains unaffected by speed, provides clean and noise-free electrical signals, and requires zero maintenance.

The MC series is available both in end of shaft and through-bore configurations in a range of amperage levels, dependent on your needs. For applications requiring high frequency and high current, Meridian Laboratory offers specialized versions to accommodate for temperature rise due to eddy currents.

Watch the video below to see first hand the benefits which ROTOCON rotary grounds can provide.

Why Choose ROTOCON? Request a ROTOCON quote

RPMModel dependent, see model specifications below*
MOUNTINGEnd of shaft with threaded stud or flange, or with set screws onto shaft (through-hole MCT Series) Click here for installation and best practices video.
HOUSING304 Stainless steel
TERMINATIONSCable lug over threaded shaft, supplied with hardware and crush washers - flanges optional
OPERATIONCan be operated in any direction or orientation
MAINTENANCEFeatures permanently lubricated bearings, brush-free design requires no user maintenance
AMPERAGEModel dependent, see specifications chart - 100% overload allowed for <60 seconds
FREQUENCYDC to 1GHz - Contact Meridian Laboratory for ampacity ratings at higher frequencies
ROTATING CONTACT RESISTANCESame as stationary contact resistance (<0.1mΩ)
OPERATIONIntrinsically immune to internal arcing
AMBIENT TEMPERATURENot to exceed 160˚F (70˚C)
IP RATINGAvailable up to IP67
  • Extremely low contact resistance
  • Maintenance free
  • Unaffected by RPM and use over time
  • Environmentally sealed
  • Available in through-bore and end of shaft designs


  • Rotary welding
  • Electro-plating
  • Rotary cutting
  • Rotary magnetrons/sputtering deposition
  • Cable reels
  • Electro-polishing

End of Shaft Models (MC Series)

MC Series

ModelMax Current (Continuous)Total LengthBody LengthDiameterStud Size/ThreadWeightRPM (Continuous / Momentary)
MC-250250A4.50"2.00"1.63"3/8"-161.3 Lbs.1,750 / 3,000
MC-500500A5.25"2.31"2.00"9/16"-122.3 Lbs.1,250 / 2,500
MC-750750A6.62"2.62"2.50"3/4"-104 Lbs.750 / 1,500
MC-10001000A8.62"3.62"3.00"1"-815 Lbs.500 / 1,000
MC-20002000A14.5"6.25"4.50"1-1/2"-632 Lbs.350 / 500
MC2F-3000 3000A10.00"6.375"5.00"Flange Mount48 Lbs.250 / 450
MC-60006000A20.97"8.41"6.00"2"-4.584 Lbs.250 / 450
ERG-60006000A10.01"8.41"8.00"Flange Mount100 Lbs.250 / 450
Need a different size or arrangement? Not all models are listed, contact Meridian Laboratory for other models, and specific information.

Click here for installation and best practices page.

Through-Bore Models (MCT Series)

MCT Series

Model #
(Specify the exact Hole Diameter within the range)
Hole Diameter Range Max Current (Amps)Total Length (TL)Outside Diameter (OD)Stud Size / ThreadRPM (Continuous / Momentary)
MCT-250 / 0.125 - 1.2500.125" - 1.250"250A4.00"3.00"3/8"-16500 / 750
MCT-500 / 0.125 - 0.5000.125" - 0.500"500A4.00"4.00"9/16"-12300 / 500
MCT-500 / 0.500 - 1.0000.500" - 1.000"500A4.83"4.00"9/16"-12300 / 500
MCT-500 / 1.000 - 2.0001.000" - 2.000"500A7.00"4.25"9/16"-12250 / 400
MCT-500 / 2.000 - 2.5002.000" - 2.500"500A6.00"4.50"9/16"-12250 / 400
MCT-1000 / 0.500 - 1.5000.500" - 1.500"1000A5.18"4.50"3/4"-10200 / 300
MCT-2000 / 0.250 - 1.7500.250" - 1.750"2000A8.50"5.50"3/4"-10100 / 300
MCT-3000 / 0.250 - 1.7500.250" - 1.750"3000A10.34"6.00"Flange100 / 200
Need a different size or arrangement? Not all models are listed, contact Meridian Laboratory for other models, and specific information.

Click here for installation and best practices page.

Why Choose ROTOCON? Request a ROTOCON quote