new 1pc Asiantool Mercury Conductive Slip Ring A4H 4Poles 30A Rotary Connector 250V

Asiantool · Rotary Connector · A4H · Mercury Slip Ring

What Is the Asiantool A4H Mercury Slip Ring?

The Asiantool A4H is a mercury-wetted conductive slip ring with 4 poles rated at 30A and 250V. It transfers electrical power and signals across a continuously rotating interface — unlike brush-type slip rings, mercury-wetted contacts provide virtually zero electrical noise, low and constant contact resistance, and long maintenance-free life. Used in rotating machinery such as packaging machines, rotary tables, and wind turbine pitch controls.

In short: A 4-pole 30A mercury-wetted slip ring that transfers power and signals across rotating joints — noise-free electrical connection for machinery with continuous 360-degree rotation, no brush wear or maintenance.

Key Features

1. Mercury-Wetted Contact Technology

What it means: Liquid mercury provides the electrical contact between stationary and rotating terminals — no solid brushes to wear.
Why it matters: Conventional brush slip rings generate electrical noise, wear out, and require periodic brush replacement — mercury contacts eliminate all three issues.
Result: Decades of maintenance-free operation with constant low contact resistance under 1 milliohm.

2. 4-Pole Independent Channels

What it means: Four electrically isolated circuits can be transferred simultaneously through the rotating interface.
Why it matters: Power (2 poles) and signal (2 poles) can share one slip ring, or three-phase power plus ground can be transferred.
Result: One compact rotary connector replaces multiple individual slip rings, simplifying mechanical design.

3. 30A High Current per Pole

What it means: Each of the 4 poles handles 30 amperes continuously.
Why it matters: Many rotary applications involve significant power — heaters, motors, solenoids — not just low-current sensor signals.
Result: Direct power transfer without needing to step down current through additional rotary transformers or inductive couplers.

Key Specifications

Typical Applications

• Rotary Packaging Machines: Transferring power and sensor signals to rotating sealing jaws and filling heads on continuous-motion packaging lines.
• Rotary Indexing Tables: Providing power and control signals to workholding fixtures on multi-station automated assembly dial tables.
• Wind Turbine Pitch Control: Transferring power and communication to blade pitch adjustment mechanisms in the rotating hub.
• Cable Reels and Winders: Maintaining electrical connection to rotating cable drums and hose reels on mobile and marine equipment.

Frequently Asked Questions

"What are the safety considerations for mercury slip rings?"

Mercury slip rings are sealed units — the mercury is contained within the housing and does not leak during normal operation. They should not be operated above their rated temperature (typically 60 degrees Celsius maximum) as mercury vapor pressure increases with temperature. Dispose of at end of life through approved hazardous material channels — do not discard in general waste.

"What is the maximum rotation speed?"

Mercury slip rings of this type typically support 100-500 RPM depending on the specific model. The centrifugal force at high RPM can disrupt the mercury pool contact. Verify the maximum rated speed from the datasheet. For very high-RPM applications (above 1000 RPM), brush-type or fiber-optic rotary joints may be more appropriate.

"Can mercury slip rings be mounted in any orientation?"

Orientation matters — mercury slip rings are typically designed for horizontal (shaft horizontal) or vertical (shaft vertical) mounting as specified by the manufacturer. Incorrect orientation may cause mercury pooling issues that result in intermittent contact or uncovered electrodes. Verify the approved mounting orientation for the A4H from the Asiantool datasheet.

"Does KOEED carry slip rings with different pole counts or current ratings?"

Yes — we source a range of slip rings including mercury, brush, and fiber-optic types with various pole counts and ratings. Send your specification (poles, current per pole, voltage, RPM, mounting orientation) to Moritta@KOEED.COM for a matched recommendation.

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