Capsule slip rings
Rotary Systems Capsule slip rings (SR009, SR010)
Gold-contact capsule slip rings in anodised aluminium housings rated up to 3 A at 150 V DC (SR009) or 2 A at 250 V DC (SR010), at up to 750 rpm.
Key specifications
| Current per circuit (max) | 3 A |
|---|---|
| Voltage (max) | 250 V |
| Speed (max) | 750 rpm |
| Contacts | gold |
Summarised in our own words from Rotary Systems Inc.'s published data; series maxima, individual models vary. Last checked 2026-10-30. Source 1
Notes on this data
Circuit counts not published on the overview.
Specify Motion is not affiliated with Rotary Systems Inc.. Rotary Systems and Capsule slip rings (SR009, SR010) are used only to identify the product. Comparisons use published figures; always confirm against the current datasheet.
Typical applications
Alternatives that meet or exceed these figures
Engineers often come to us with a Rotary Systems part number and leave with an alternative that is easier to source, quicker to deliver or a better fit for the machine. These series from our supply network is the closest match on published figures.
Compact capsule slip rings that carry mixed power and signal in a small footprint, with gold-to-gold contacts for low noise and low torque. AR is the larger body, BR mid-size and CR the miniature range.
| Published maximum | Capsule slip rings (SR009, SR010) | AR/BR/CR Series Capsule Slip Rings |
|---|---|---|
| Circuits | — | 76 |
| Current per circuit | 3 A | 15 A meets or exceeds |
| Speed | 750 rpm | 300 rpm |
| Voltage | 250 V | 240 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.
What a capsule slip ring is
A capsule slip ring is a compact, solid-centre rotary electrical joint that passes power and signals from a fixed frame to a rotating assembly. Precious-metal brushes, usually gold on gold, ride on a stack of small-diameter rings inside a sealed cylindrical housing, so surface speed, contact noise and wear all stay low. Because there is no bore, the unit sits on the axis of rotation, typically fixed by a flange at one end with flying leads leaving each side. Capsules carry many signal circuits and modest power in a very small envelope.
When engineers choose a capsule slip ring
Choose a capsule when the centre of the rotating axis is free and space is tight, as in camera heads, small turntables, sensor heads and robot wrists. Small rings give low drag torque, low electrical noise and long life, which suits analogue, encoder and low-level data signals. The trade-offs are current and access: power rings are typically limited to a few amps each, and nothing can pass through the middle. If a shaft, hose or cable must run along the axis, a through-bore design is the better fit.
How to specify the Rotary Systems Capsule slip rings (SR009, SR010)
Send these with your enquiry and an engineer can confirm the right Capsule slip rings (SR009, SR010) variant or an equivalent:
- Number of circuits, split into power, signal and data
- Current per circuit (A) and working voltage (V AC or DC)
- Maximum and continuous speed (rpm)
- Envelope: outer diameter and length (mm)
- Signal types: analogue, encoder, RS485, CAN, Ethernet or video
- Ingress protection (IP code) and temperature range (°C)
- Lead length, wire gauge and connector terminations
Common mistakes to avoid
- Pushing one ring past its current rating instead of paralleling two or more rings per conductor
- Mixing motor power and low-level signals on adjacent rings without screening or allocation planning
- Fixing the rotor rigidly to a shaft that runs out, so bearing loads go through the capsule
- Letting the leads act as the anti-rotation device instead of fitting a proper torque strap or pin
Rotary Systems Capsule slip rings (SR009, SR010): frequently asked questions
What is the Rotary Systems Capsule slip rings (SR009, SR010)?
Gold-contact capsule slip rings in anodised aluminium housings rated up to 3 A at 150 V DC (SR009) or 2 A at 250 V DC (SR010), at up to 750 rpm. Published series figures include current per circuit 3 A, voltage 250 V, speed 750 rpm. It is made by Rotary Systems Inc.; Specify Motion can help source it or propose an equivalent.
Who makes the Rotary Systems Capsule slip rings (SR009, SR010)?
The Rotary Systems Capsule slip rings (SR009, SR010) is made by Rotary Systems (Rotary Systems Inc.) and is listed here for engineers comparing options. Specify Motion is not affiliated with Rotary Systems Inc.; brand names are used only to identify the product.
What is the current per circuit of the Rotary Systems Capsule slip rings (SR009, SR010)?
The published series maximum current per circuit is 3 A. Individual models and sizes in the Capsule slip rings (SR009, SR010) 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 Rotary Systems Capsule slip rings (SR009, SR010)?
Yes. On published figures, AR/BR/CR Series Capsule Slip Rings is the closest match from our supply network. An engineer confirms the fit against your application before recommending anything.
What is the difference between a capsule and a through-bore slip ring?
A capsule slip ring has no central hole and mounts on the end of the rotating axis, which keeps the rings small, drag torque low and life long. A through-bore slip ring has a hollow centre so a shaft, air line or cable can pass along the axis. At equal rpm, through-bore rings run at a higher surface speed and are larger, so choose by whether the axis is free.
How much current can a capsule slip ring carry?
Signal rings in a capsule typically carry well under an amp, while dedicated power rings are commonly rated at a few amps up to around 10 A depending on the design. For a heavier load, several rings are paralleled on one conductor, which uses up circuit count and length. If the machine needs tens of amps, a through-bore or purpose-built high-current unit is usually more practical.
Further reading: How to select a slip ring · How to specify a slip ring · Slip rings
Other capsule slip rings series
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