Heavy Current Carbon Brush Slip Ring 5 Circuits 250A per Channel 380V 100RPM 75mm Inner Diameter
Product Overview
The 5-Circuit 250A Heavy Current Carbon Brush Slip Ring is a purpose-built rotary electrical connector designed to transmit high-amperage power between stationary and rotating components. With a 75mm central through-bore, it mounts directly onto equipment rotating shafts, saving space while delivering reliable 360° continuous power transfer at up to 250A per channel.
This slip ring is particularly suited for demanding industrial environments where large currents must be transferred reliably under continuous rotation — such as electroplating and electrolysis lines, rotary welding machines, wind turbine pitch/yaw systems, cable and hose reels, cranes, excavators, and large DC/AC motors.
Key Specifications
| Parameter | Specification |
|---|---|
| Number of Circuits | 5 independent channels |
| Rated Current | 250A per channel |
| Rated Voltage | 0–380V AC/DC |
| Operating Speed | 0–100 RPM |
| Inner Diameter (Bore) | 75 mm |
| Contact Material | Copper ring + carbon-graphite brush |
| Ring Material | High-purity copper, silver or gold plated |
| Insulation Material | Engineering plastic (POM / PA / PEEK optional) |
| Dielectric Strength | ≥1000V @ 50Hz between circuits |
| Insulation Resistance | ≥1000MΩ @ 500VDC |
| Dynamic Contact Resistance | ≤10 mΩ |
| Operating Temperature | -30°C to +80°C (custom up to +200°C available) |
| Protection Level | IP51 standard (IP54 / IP65 optional) |
| Expected Service Life | 5,000–10,000 hours brush life under rated load |
Core Advantages
Ultra-High Current Capacity
Each channel carries up to 250A continuously. High-purity copper rings with silver/gold surface treatment minimize resistance and heat generation, ensuring stable performance under heavy load.
Self-Lubricating Carbon-Graphite Brushes
Graphite brushes provide natural self-lubrication, reducing friction and wear on both brush and ring surfaces. The result is a longer service life and consistent electrical contact with minimal arcing.
Low Contact Resistance, Minimal Heat
Precision-machined copper rings with plated surfaces achieve dynamic contact resistance ≤10 mΩ, effectively controlling temperature rise even under 250A continuous current.
Rugged Engineering Plastic Insulation
Insulating components use high-performance engineering plastics (POM, PA, or PEEK) offering high dielectric strength, temperature resistance, and reliable isolation between the 5 circuits — eliminating inter-ring short circuit risks.
Compact 75mm Through-Bore Design
The 75mm inner diameter allows direct shaft mounting, making the slip ring easy to integrate into existing rotating equipment without major structural changes.
Easy Maintenance
The brush holders are externally accessible, allowing quick inspection and brush replacement without disassembling the entire unit — a critical advantage for continuous-duty industrial operations.
Cost-Effective & Reliable
Compared with precious-metal slip rings, the copper-carbon brush system delivers excellent performance at a moderate cost, making it the preferred choice for heavy industrial power transmission.
Typical Applications
- Wind Power: Pitch and yaw drive power transmission
- Metallurgy & Plating: Electroplating, electrolysis, and anodizing equipment
- Welding Industry: Rotary welding machines requiring stable current transfer
- Cranes & Excavators: Cable reels, hose reels, and rotating cabins
- Motors & Generators: Power and excitation current transfer between stationary and rotating parts
- Mining & Drilling Rigs: Rotary drives and sensors in harsh conditions
- Entertainment: Rotating stages, carousels, and 360° display platforms
- Industrial Machinery: Rotary tables, turntables, and automated production lines
Customization Options
We provide full non-standard customization to match your exact application:
- Circuit Configuration: Combine power circuits (up to 250A+) with signal channels (Ethernet, CAN, RS485, etc.)
- Current & Voltage: Scalable from 50A to 3000A per channel; voltage up to 10000V
- Speed: Standard 0–100 RPM; higher-speed designs available up to 20000 RPM
- Bore Size: 0–1000mm inner diameter available
- Protection: IP51 standard; optional IP54 / IP65 / IP68 for harsh environments
- Temperature Range: Standard -30°C to +80°C; extended -60°C to +200°C
- Housing: Engineering plastic, aluminum alloy, or stainless steel
- Integration: Can be combined with pneumatic, hydraulic, RF, or fiber optic rotary joints
