High-speed slip rings
Moog EC3848 (incl. EC4294, EC4199) high-speed slip ring
Small high-speed capsule slip ring rated to 10,000 rpm for low-level signals, used in centrifuges and medical instruments.
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Key specifications
| Circuits (max) | 10 |
|---|---|
| Current per circuit (max) | 1 A |
| Voltage (max) | 120 V |
| Speed (max) | 10,000 rpm |
| Outer diameter | 30.5–31.75 mm |
Summarised in our own words from Moog Inc.'s published data; series maxima, individual models vary. Last checked 2026-10-29. Source 1 · Source 2 · Source 3 · Source 4
Notes on this data
Web page 100 VDC; guide "low mV to 120 VDC". Circuits 2/6/8/10. OD per web page "1.25 x 1.20 in (31.75 - 30.5)".
Specify Motion is not affiliated with Moog Inc.. Moog and EC3848 (incl. EC4294, EC4199) are used only to identify the product. Comparisons use published figures; always confirm against the current datasheet.
Moog EC3848 (incl. EC4294, EC4199) replacement and alternative options
Use these supply-network options as a starting point for an engineering check. We can also help source the original Moog part. Published series figures do not establish an exact-model or drop-in replacement: confirm ratings, fit, interfaces and approvals for your application.
Slip rings built for 800 to 15,000 rpm, mainly used on test rigs and non-destructive testing equipment.
| Published maximum | EC3848 (incl. EC4294, EC4199) | High Speed Slip Ring |
|---|---|---|
| Circuits | 10 | — |
| Current per circuit | 1 A | — |
| Speed | 10,000 rpm | 15,000 rpm meets or exceeds |
| Voltage | 120 V | — |
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.
Moog EC3848 (incl. EC4294, EC4199) model codes
Published model codes in the EC3848 (incl. EC4294, EC4199) range. Search this page for your part number, or send it to us for availability or an equivalent.
| Model code | Pricing / replacement |
|---|---|
| EC3848 | Quote or replacement for EC3848 → |
| EC4294 | Quote or replacement for EC4294 → |
| EC4199 | Quote or replacement for EC4199 → |
Typical applications
What a high-speed slip ring is
A high-speed slip ring is a rotary joint built to run at speeds well above general industrial units, typically from a few thousand to over ten thousand rpm. To manage heat and wear, designers keep ring diameters small, use precisely balanced rotors and high-precision bearings, and select brush materials and contact forces for the higher surface speed. Some designs use liquid or forced-air cooling. Most high-speed units carry low-level signals such as strain gauges and thermocouples, with limited power circuits.
When engineers choose a high-speed slip ring
Choose a high-speed design for test rigs, spindles, centrifuges, turbines and tyre or wheel testing where the rotating sensors spin far faster than a normal slip ring allows. The trade-offs are circuit count, current and life: speed limits how big the rings can be, and brush wear rises with surface speed, so service intervals may be shorter. For very high data rates at speed, telemetry or contactless transfer may be an alternative. Balance and runout of the mounting shaft are critical.
How to specify the Moog EC3848 (incl. EC4294, EC4199)
Send these with your enquiry and an engineer can confirm the right EC3848 (incl. EC4294, EC4199) variant or an equivalent:
- Maximum and continuous speed (rpm)
- Duty: continuous running or short test runs
- Number and type of signal circuits, such as strain gauge, thermocouple or encoder
- Acceptable electrical noise (mΩ or µV)
- Power circuits and current (A)
- Shaft or bore interface and permissible runout (mm)
- Cooling, lubrication and expected service interval (h)
Common mistakes to avoid
- Mounting on a shaft with runout that the slip ring bearings cannot tolerate at speed
- Quoting peak test speed but not how long the rig runs there
- Using standard thermocouple wire through the rings and creating junction errors
- Forgetting the slip ring's own drag torque and inertia in rig calculations
Moog EC3848 (incl. EC4294, EC4199): frequently asked questions
Can you help replace Moog EC3848 (incl. EC4294, EC4199) or source the original?
Send the full model code, quantity and required date. Our engineers can check original-part availability and assess suitable alternatives, including supply-network options where appropriate. We confirm compatibility and any changes needed before recommending a replacement.
What is the Moog EC3848 (incl. EC4294, EC4199)?
Small high-speed capsule slip ring rated to 10,000 rpm for low-level signals, used in centrifuges and medical instruments. Published series figures include circuits 10, current per circuit 1 A, voltage 120 V, speed 10,000 rpm. It is made by Moog Inc.; Specify Motion can help source it or propose an equivalent.
What model codes are in the Moog EC3848 (incl. EC4294, EC4199) range?
The EC3848 (incl. EC4294, EC4199) range includes EC3848, EC4294, EC4199. The table on this page lists each published model code with its key figures. Send us the code you use, or the one you need to replace, and our engineers will confirm availability, lead time or the closest equivalent.
Who makes the Moog EC3848 (incl. EC4294, EC4199)?
The Moog EC3848 (incl. EC4294, EC4199) is made by Moog (Moog Inc.) and is listed here for engineers comparing options. Specify Motion is not affiliated with Moog Inc.; brand names are used only to identify the product.
What is the circuits of the Moog EC3848 (incl. EC4294, EC4199)?
The published series maximum circuits is 10. Individual models and sizes in the EC3848 (incl. EC4294, EC4199) range vary, so check the exact variant against your duty cycle, mounting and environment, or ask our engineers to confirm the right size for you.
Is there an alternative to the Moog EC3848 (incl. EC4294, EC4199)?
We can assess suitable replacement options. On published figures, Motion Control Products High Speed Slip Ring is options to assess from our supply network. An engineer confirms the fit against your application before recommending anything.
How fast can a slip ring rotate?
General industrial slip rings are typically rated to a few hundred rpm, while dedicated high-speed designs commonly reach several thousand to over ten thousand rpm. The practical limit depends on ring diameter, because surface speed sets brush wear and heat. Small-diameter capsules reach the highest speeds, while large-bore units are rated lower. Always check both maximum speed and continuous rating.
Can strain gauge signals pass through a slip ring cleanly?
Yes, when the rings use low-noise precious-metal contacts and the circuits are allocated well. Use dedicated rings for each bridge connection, keep them away from power, and consider amplifying or digitising on the rotor where noise is critical. Contact resistance variation is the main noise source, so state the acceptable level and the expected speed.
Further reading: How to select a slip ring · How to specify a slip ring · Slip rings
Other high-speed slip rings series
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