Description

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UL3135 cable is a safety standard published by Underwriters Laboratories (UL) titled "Fused Power Cables." It specifically covers single-conductor, fused, power-supply cable sets intended for use in equipment where a field-wiring connection to the mains supply is required.
In simpler terms, UL 3135 is not just a wire; it's an integrated assembly that combines a power cable with one or more fuses within its plug body. This built-in fuse provides critical point-of-use overcurrent protection for the equipment it powers.
The most common and recognizable form of a UL 3135 cable is an IEC 60320 C13/C14 connector-based cable, often with a fused plug (like a UK BS 1363 plug or a Schuko plug).

Technical Specifications

Conductor	Tinned copper, single wire or multi-strand twisted, specification 26 - 12 AWG.
Insulation layer	Glass fiber weaving with silicone resin coating, used to enhance wear resistance, weather resistance, and mechanical protection; the outermost non-woven layer is silicone rubber insulation.
Inner layer	Tinned Copper
Outer layer	PVC or TPE
Voltage Rating	300V
Temperature Rating	-20°C to +105°C
Color Options	Multiple colors available
Flame Test	UL VW-1 compliant
Compliance	UL, RoHS

Products Applications

UL 3135 cables are ubiquitous in equipment that requires robust and safe field wiring. You will find them in:

Information Technology (IT) Equipment: Racks of servers, routers, switches, and network storage devices often use multiple fused power distribution units (PDUs).
Test and Measurement Equipment: High-end oscilloscopes, spectrum analyzers, and laboratory power supplies.
Professional Audio/Video Equipment: Power amplifiers, mixing consoles, broadcast equipment, and large displays.
Medical Equipment: Critical and life-support equipment where safety and reliability are paramount (e.g., dialysis machines, patient monitors, diagnostic imaging devices). These often require a specific medical-grade version.
Industrial Machinery: CNC machines, robotic arms, and control cabinets where a fused disconnect at the point of entry is a safety requirement.
Appliances and Commercial Equipment: High-wattage appliances, commercial food service equipment, and vending machines.
Power Distribution Units (PDUs): This is one of the most common applications. The PDU itself is fed by a heavy-duty fused cable (UL 3135), which then distributes power to multiple non-fused outlets (C13) for individual servers or devices.
In summary, a UL 3135 cable is a fused power entry solution that provides critical point-of-use overcurrent protection, enhancing the safety, reliability, and regulatory compliance of a wide range of electrical and electronic equipment.

Products Advantages

Localized Overcurrent Protection: The fuse is located right at the power entry point to the equipment. This provides a very fast and specific level of protection tailored to the equipment's needs, preventing internal faults from drawing dangerous current.
Equipment Protection: Protects sensitive and expensive internal components (like PCBs, transformers, and motors) from damage caused by overcurrent conditions, short circuits, or internal faults.
Safety Compliance: Using a UL 3135 Listed cable ensures the entire power entry system meets a recognized safety standard, which is often required for product certification (like UL/ETL/cTUVus) and for meeting building and electrical codes.
User-Replaceable Safety: If a fault occurs, the user can simply and safely replace the fuse in the plug instead of having to replace the entire cable or requiring a service technician. The design prevents accidental contact with live terminals.
Convenience and Standardization: Provides a ready-made, certified solution for manufacturers, simplifying their design and certification process for the power inlet.