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High Current Rotary Ground Clamp


Innovative Maintenance-Free Rotary Ground Clamp

»  Provides consistent low and stable resistance for high current applications»  Robust industrial design provides reliable long lasting performance
»  Requires ZERO grease or routine maintenance»  Remains unaffected by RPM or total number of revolutions

Tired of poor rotary ground consistency? Consistently having to grease and maintain a metal-on-metal rotary ground? Is fluctuating resistance causing variable consistency in your process, leading to scrapped product?  If you are experiencing any of these problems associated with traditional rotary grounds, a ROTOCON rotary ground is the solution.

Meridian Laboratory’s full lineup of single contact, high-current rotary ground clamps provides a consistent, maintenance-free, rotating electrical contact and connection unaffected by instantaneous RPM (for high speed applications) or total number of revolutions; ROTOCON rotary grounds oftentimes surpass 500M (million) revolutions without demonstrating a change in electrical resistance or performance. Contrary to conventional brushed rotary grounds, Meridian Laboratory’s ERG/MC & ERGT Series are arc-free, do not have internal friction, and do not require greasing or any type of maintenance. All high current ROTOCON ERG/MC & ERGT Series rotary grounds are built environmentally sealed, and with 304SS corrosion proof housings to ensure a long service life without maintenance, even in the most challenging manufacturing environments and chemical exposure.

Suitable for all environments and applications including rotary welding, electro-plating, electro-polishing, cutting, and other high current rotating industrial applications, the ROTOCON ERG/MC & ERGT Series is designed to withstand 100% duty cycles in continuous manufacturing and production processes, without interruption or downtime. The ROTOCON’s brush-free design eliminates all issues such as maintaining brush contact and conductivity, does not require application of conductive greases, and eliminates elevated contact resistance associated with conventional brushed rotary grounds. With the ERG Series, you will achieve a more consistent ground, with zero fluctuations in resistivity, or elevated contact resistance over time and revolutions; this will lead to a better end product in rotational welding, plating, polishing, and other high current applications that require rotation.  ROTOCON rotary grounds can be used interchangeably on the positive or negative (ground) of an application without any difference in performance.

ROTOCON rotary grounds are available both in end of shaft (ERG Series) and through-bore (ERGT Series) configurations in a range of amperage levels.  For applications requiring high frequency AC and high current (for sputtering deposition, and other similar applications), Meridian Laboratory offers specialized versions to accommodate for temperature rise due to eddy currents and skin effect.

Read about the development of the ERG Series of electrical rotary grounds here.

Watch the video below to see first hand the benefits which ROTOCON rotary grounds can provide compared to metal-on-metal contacts.

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 RATINGStandard is IP65, Available up to IP68
RoHS COMPLIANCEOptional, RoHS /CE Compliancy Available
  • Rotary welding
  • Electro-plating
  • Rotary cutting
  • Rotary magnetrons/sputtering deposition
  • Cable reels
  • Electro-polishing

End of Shaft Models (ERG & MC Series)

MC Series

ModelMax Current (Continuous)Total LengthBody LengthDiameterStud Size/Thread
ERG-400400AProduct specifications for the ERG-400 are dependent on the mounting option your project requires, learn more from the ERG-400 Product Page
ERG-800800AProduct specifications for the ERG-800 are dependent on the mounting option your project requires, learn more from the ERG-800 Product Page
MC2F-3000 3000A10.00"6.375"5.00"Flange Mount
MC2F-60006000A10.01"8.41"8.00"Flange Mount
ERG-1000010000A7.94"4.28"10.61"Flange Mount
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 (ERGT Series)

MCT Series

Model #
(Specify preferred hole diameter as XXXX)
Minimum Hole DiameterMaximum Hole DiameterMax Current (Amps)Total Length (TL)Outside Diameter (OD)Number of Conductive Studs on BodyStud Size / ThreadRPM (Continuous / Momentary)
ERGT-500-XXXX0.250"2.000"500A4.55"4.3"11/2"-13200 / 400
ERGT-1000-XXXX0.250"2.000"1000A4.55"4.3"21/2"-13200 / 400
ERGT-1500-XXXX0.250"2.000"1500A4.55"4.3"31/2"-13200 / 400
ERGT-2000-XXXX0.250"2.000"2000A4.55"4.3"41/2"-13200 / 400
ERGT-2000-XXXX1.000"2.500"2000A5.187"6"41/2"-13150 / 300
ERGT-3000-XXXX1.000"1.000"3000A5.187"6"61/2"-13150 / 300
NoteThrough-Hole diameter can be specified at time of order to exact dimension; standard tolerance of bore is +0.003" / -0.000"Assumes 100% duty cycle of direct current (DC); alternating current (AC) will have lesser ampacity ratingAll conductive studs must be used to guarantee rated amperage maximumHigher RPMs acceptable if for momentary time, or if max temperature rating not exceeded
Need a different size or arrangement? Custom models are available, contact Meridian Laboratory for other models, and specific information.

Click here for installation and best practices page.

Why Choose ROTOCON? Request a ROTOCON quote