PDK81301-4*0.75+4*2*0.2+D Watertight Cable – 4x0.75mm² Power + 4 Shielded Signal Pairs With Common Drain Wire, Tinned Copper, XLPE Insulation, TPU Jacket, For Subsea Sensors & Control

This PDK81301 hybrid watertight cable is specifically designed for subsea instrumentation, oceanographic monitoring, and offshore control systems that require a combination of moderate‑power distribution, multiple noise‑immune signal channels, and a dedicated ground reference – all within a compact water‑blocked envelope. It integrates four 0.75 mm² (approx. AWG 18) power conductors for supplying sensors, lights, or small actuators, and four individually shielded twisted pairs (4×2×0.2 mm²) for differential signals (RS‑485, CAN, 4‑20 mA), plus a common drain wire (D) that provides a convenient grounding path for the overall shield or serves as a dedicated earth conductor. All copper conductors are tinned to ensure superior corrosion resistance in seawater and humid environments. XLPE (Cross‑linked Polyethylene) serves as the primary insulation, offering high thermal stability (up to +90°C), excellent dielectric strength, and extremely low moisture absorption – critical for long‑term underwater reliability. The outer jacket is extruded from TPU (Thermoplastic Polyurethane) , delivering outstanding abrasion, oil, and hydrolysis resistance, as well as flexibility for installation and handling. The cable features a multi‑layer watertight construction with water‑swellable tapes and pressure‑resistant fillers to prevent radial and longitudinal water ingress. It is ideal for ROV sensor tethers, subsea instrument nodes, offshore platform monitoring, and marine renewable energy systems – where reliable power, clean signal transmission, and absolute watertight integrity are essential.

Key Features – Tinned Copper Conductors, XLPE Insulation, Shielded Pairs with Common Drain Wire, TPU Sheath

Tinned copper conductors – four 0.75 mm² stranded power cores for efficient low‑to‑medium current delivery (up to 6‑8 A per core); tinning prevents galvanic corrosion.

Four shielded twisted pairs (4×2×0.2 mm²) – each pair is individually wrapped with aluminum foil (100% coverage) for excellent EMI rejection and crosstalk isolation, ideal for differential signaling.

Common drain wire (D) – a single tinned copper drain wire (typically 0.2‑0.3 mm²) runs alongside the pairs, providing a centralized grounding point for shield termination or serving as a separate earth conductor.

XLPE insulation – rated -40°C to +105°C (short‑term up to +120°C); exhibits very low moisture uptake, high dielectric strength, and resistance to seawater, acids, and alkalis – outperforming standard PE in thermal and mechanical durability.

TPU outer sheath – polyurethane jacket provides superior abrasion, cut, tear, and hydrolysis resistance; remains flexible at low temperatures and resists oils, greases, UV, and marine fouling.

Watertight integrity – multi‑layer water‑blocking tapes and compact core filling prevent water migration along the cable, even under hydrostatic pressure.

Ideal For

ROV and AUV tether sections for powering cameras, lights, and sensors with multiple RS‑485/4‑20 mA links and a common ground

Subsea observatories and ocean bottom stations with distributed sensor arrays and shared power bus

Offshore platform structural health monitoring (vibration, strain, temperature) requiring multiple signal channels

Underwater acoustic hydrophone networks with individual shielded pairs and a return path

Marine renewable energy system controls (wave/tidal) with integrated power and signal lines

Any subsea application demanding 4 power cores + 4 shielded signal pairs + common drain wire + watertight performance without tension requirements

Conclusion
This PDK81301 hybrid watertight cable offers a practical, high‑reliability solution for subsea systems that require both power and multiple shielded data lines with a common reference. The combination of tinned copper conductors, XLPE insulation, individually shielded pairs, a common drain wire, and a rugged TPU sheath ensures stable, interference‑free operation under continuous seawater exposure. It is an ideal choice for oceanographic instrumentation, offshore monitoring, and underwater robotics.

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