6-channel 20-hole electric slip rings with a central hole design are for

This product is a high-performance through-hole type slip ring, specifically designed for rotating equipment requiring centralized transmission of high current or multiple signals. It features an aluminum alloy housing and a hollow through-hole structure, with a standard inner diameter of 25.4mm and a compact outer diameter of 86mm. The product integrates six independent circuit channels, each capable of stably carrying 20A of current, for a total current carrying capacity of up to 120A. The core contact parts are made of precious metals, supporting a 440V operating voltage and a speed of 250rpm, and possessing an IP51 protection rating. It is an ideal power and signal transmission hub for applications such as industrial robots, large rotary tables, packaging machinery, and specialized testing equipment.

• 6-channel × 20A High Current Carrying Capacity: Provides 6 independent channels, each supporting 20A current, with a total current carrying capacity of 120A. It can simultaneously drive multiple high-power motors, heaters, or actuators, meeting the centralized power distribution needs of heavy equipment.
• 25.4mm Standard Hollow Through-Hole: A 25.4mm (1-inch) center through-hole allows power lines, signal lines, air pipes, or hydraulic pipes to pass through, simplifying wiring at rotating ends and enabling multi-media integration.
• 440V High Voltage Compatibility: Supports a maximum operating voltage of 440V, allowing direct connection to industrial three-phase power grids (380V/400V/440V) without the need for voltage conversion, offering strong adaptability.
• Precious Metal Contact Materials: Utilizes gold-gold or silver alloy contacts, possessing extremely low contact resistance and excellent oxidation and wear resistance, ensuring long-term stability for high current and weak signal transmission.
• Efficient Heat Dissipation with Aluminum Alloy Housing: The aluminum alloy material combined with IP51 protection effectively dissipates heat and prevents dust and drips, adapting to industrial workshop environments and extending product lifespan.

• Industrial robots and robotic arms: Power supply for high-power servo motors at joints and feedback of encoder signals.
• Large rotary worktables: Centralized transmission of power and signals for multi-station fixtures in automated assembly, welding, and inspection equipment.
• Packaging and printing machinery: High-current drive and synchronous control for high-speed rotating rollers and cutting units.
• Testing and measurement equipment: Multi-channel power loading and data acquisition for rotary tables used in aerospace and automotive component testing.
• Specialized engineering vehicles: Main power and control system connections for the rotating platforms of concrete pump trucks and aerial work platforms.

Q1: Can all six 20A channels operate at full load simultaneously? What is the total power capacity?
A: Yes. Operating all six channels at full load simultaneously provides a total current of 120A. Based on a voltage of 440V, the theoretical power transmission capacity is 52.8kW (DC or single-phase AC). In actual applications, the power supply capacity and heat dissipation conditions must be matched; we recommend providing specific operating parameters for a thermal assessment.

Q2: What is the maximum outer diameter of cables or conduits that can pass through the 25.4mm inner bore?
A: The 25.4mm inner bore can accommodate:

Multiple cables with an outer diameter ≤20mm (e.g., three 6mm² cables and five 2.5mm² cables)

Multiple air/fluid lines with an outer diameter ≤8mm (e.g., 3–4 lines)

Fiber optic cables or sensor wire harnesses

If larger conduits (such as G3/8” hoses) need to pass through, models with larger bore sizes (38.1mm or 50mm) are available.