Stemmann-Technik MK series (MKSR, MKSRR, MKSK) high-current slip ring

Key specifications

Summarised in our own words from Wabtec Corporation's published data; series maxima, individual models vary. Last checked 2026-10-30. Source 1

Notes on this data

1,200 A is stated for the MKSK series; the page does not say whether per ring. Voltage, speed and temperature not published.

Specify Motion is not affiliated with Wabtec Corporation. Stemmann-Technik and MK series (MKSR, MKSRR, MKSK) are used only to identify the product. Comparisons use published figures; always confirm against the current datasheet.

Stemmann-Technik MK series (MKSR, MKSRR, MKSK) replacement and alternative options

Use these supply-network options as a starting point for an engineering check. We can also help source the original Stemmann-Technik part. Published series figures do not establish an exact-model or drop-in replacement: confirm ratings, fit, interfaces and approvals for your application.

High-current slip rings

Motion Control Products BHR Series Frameless Type (Carbon Brush)

Same product type; specifications need checking

Heavy-duty carbon-brush slip rings for very high current and voltage, with copper-graphite power rings and precious-metal signal rings. Large and heavy by design, but straightforward to maintain.

Check this option and request pricing →View product details →

Figures are the highest published for each series and are not always measured the same way. A higher figure is not automatically a better choice: mounting, duty cycle, feedback, connectors and approvals matter too. An engineer will check the fit against your application before recommending anything.

Typical applications

What a high-current slip ring is

A high-current slip ring is a rotary joint built to carry heavy power, typically tens to hundreds of amps per circuit, across continuous rotation. Instead of fine precious-metal wires, it uses wider rings in copper alloy or brass and brushes in copper graphite or silver graphite, sized to keep current density and contact heating within limits. Ring spacing and insulation are increased for higher working voltages. Many designs also carry low-level signal rings on precious-metal contacts in the same assembly, separated from the power section.

When engineers choose a high-current slip ring

Choose a high-current design when motors, heaters, magnets or welding equipment on the rotating side draw more than a standard ring can handle. It suits cranes, cable reels, welding positioners and heavy turntables. The trade-offs are size, weight, drag torque and brush dust: carbon-based brushes wear and need inspection, so maintenance access matters. Where rotation is limited to a few turns, a cable carrier or cable wrap may still be simpler. Keep sensitive signals physically separate from the power rings.

How to specify the Stemmann-Technik MK series (MKSR, MKSRR, MKSK)

Send these with your enquiry and an engineer can confirm the right MK series (MKSR, MKSRR, MKSK) variant or an equivalent:

• Current per circuit, continuous and peak (A)
• Working voltage and required insulation level (V)
• Duty cycle and ambient temperature (°C)
• Speed, continuous and peak (rpm)
• Number of power circuits plus any signal or earth circuits
• Bore, envelope and mounting (mm)
• Brush inspection interval and maintenance access

Common mistakes to avoid

• Quoting the motor nameplate current but not the inrush or peak current at start-up
• Ignoring temperature rise in an enclosed housing, which derates current capacity
• Placing encoder or fieldbus rings right next to high-current motor feeds
• Leaving no access to inspect brushes and clean carbon dust

Stemmann-Technik MK series (MKSR, MKSRR, MKSK): frequently asked questions

Further reading: How to select a slip ring · How to specify a slip ring · Slip rings

Other high-current slip rings series