18-channel 20A conductive slip ring with 25.4mm through-hole for metal processing and cutting equipment

This product is a high-power-density through-hole conductive slip ring, specifically designed for complex rotating equipment requiring centralized transmission of large currents and multiple signals. It features a composite structure of an aluminum alloy housing and an engineering plastic housing, with a standard inner diameter of 25.4mm and an outer diameter of 86mm. The product integrates 18 independent circuit channels, each capable of stably carrying 20A of current, for a total current carrying capacity of up to 360A. The core contact parts are made of precious metal materials, supporting a 440V operating voltage and a speed of 250rpm, with an IP51 protection rating and an insulation resistance ≥500MΩ/300VDC. It is an ideal power transmission hub for high-power applications such as heavy-duty automated equipment, large rotary tables, multi-axis robots, and special testing equipment.

• 8-Channel * 20A High-Current Matrix: Provides 18 independent channels, each supporting 20A current, with a total current carrying capacity of 360A. It can simultaneously drive multiple high-power servo motors, heaters, or actuators, meeting the stringent centralized power distribution requirements of heavy equipment.
• 25.4mm Standard Hollow Through-Hole: A 25.4mm (1-inch) center through-hole allows power lines, signal lines, air hoses, or hydraulic hoses to pass through, simplifying rotary end wiring, enabling multi-media integration, and improving equipment design flexibility.
• 440V High Voltage Wide Compatibility: Supports a maximum operating voltage of 440V, allowing direct connection to industrial three-phase power grids (330V/400V/440V) without voltage conversion, adapting to various global voltage standards.
• Precious Metal Contacts + High Insulation Resistance: Employs gold-gold or silver alloy contacts with extremely low and stable contact resistance; insulation resistance ≥500MΩ/300VDC, ensuring no leakage risk under high voltage and pure and reliable signal transmission.
• Composite housing structure balances strength and insulation: The aluminum alloy shell provides excellent heat dissipation and mechanical protection, while engineering plastic components enhance insulation and reduce weight, achieving a balance between performance and durability.
• IP51 protection and efficient heat dissipation: The IP51 protection rating effectively prevents dust and dripping, and combined with the high thermal conductivity of aluminum alloy, ensures controllable temperature rise under continuous full-load conditions at 250 rpm, extending product lifespan.

• Large Industrial Robots: High-power servo motors at joints provide power and encoder signal feedback, supporting heavy-duty handling and precision operation.
• Heavy-duty Rotary Tables: Centralized power and signal transmission for multi-station fixtures in automated assembly, welding, and painting equipment.
• Metal Processing and Cutting Equipment: High-current drive and cooling system control for rotary platforms of laser cutting machines and plasma cutting machines.
• Testing and Measurement Equipment: Multi-channel power loading and data acquisition for rotary tables used in aerospace and automotive parts testing.
• New Energy Equipment: High-power power supply and status monitoring for wind turbine pitch systems and solar tracking brackets.
• Special Engineering Vehicles: Main power supply and control system connection for rotary platforms of concrete pump trucks, aerial work platforms, and fire trucks.

Q1: Can all 18 20A channels operate at full load simultaneously? What is the total power?

A: Yes. All 18 channels can provide a total current of 360A at full load. Based on a 440V voltage, the theoretical transmission power can reach 158.4kW (DC or single-phase AC). In practical applications, it is necessary to ensure that the power supply capacity matches the heat dissipation conditions. It is recommended to provide specific operating conditions for thermal assessment and heat dissipation scheme design.

Q2: What size cable or conduit can pass through a 25.4mm inner diameter hole?

A: A 25.4mm inner diameter can accommodate:

• Multiple cables with an outer diameter ≤ 20mm (e.g., 3 x 16mm² cables + multiple control cables)
• Multiple gas/liquid tubing with an outer diameter ≤ 8mm (e.g., 4-6 tubes)
• Several fiber optic cables and sensor harnesses

For larger conduits (e.g., G3/8" flexible tubing), 38.1mm or 50mm large-diameter models can be selected.

Q3: What does insulation resistance ≥ 500MΩ/300VDC specifically mean?

A: This is the insulation resistance value tested under 300V DC voltage. 500MΩ indicates excellent insulation performance between channels and between channels and the housing. This means:

• Leakage current less than 0.6μA, extremely low safety risk
• High withstand voltage, able to withstand higher instantaneous overvoltages
• Good long-term stability, insulation performance is not easily degraded by aging.