HST 3MM RED

HST 3MM RED

Overview

The HST 3MM RED is a red heat-shrink tube with a stated pre-installation size reference of 3 mm. It is used as an insulation and wire-protection accessory in battery packs, EV wiring, chargers, inverters, control panels and general electrical assemblies. Buyers commonly search for 3 mm red heat shrink tube, heat shrink sleeve, wire insulation tube, battery cable sleeve and electrical shrink tubing when they need a neat protective finish around conductors, joints or terminals.

Heat-shrink tubing is installed over a wire or joint and then reduced around the component by controlled heating. In battery-pack work, it can help cover exposed conductor areas, reinforce repaired insulation, identify polarity and organize small wire bundles. The red color is useful for visual circuit identification, but color alone must not be relied on as the only polarity control; technicians should still verify the circuit electrically before making a connection.

Technical Details

The stated 3 mm size should be matched to the largest part that the tube must pass over before shrinking, such as a wire joint, lug barrel or connector termination. The finished fit depends on the actual shrink ratio and recovered diameter of the supplied tubing, so the installer should confirm those values from the stock label or supplier specification when a precise seal or tight mechanical fit is required. Selecting tubing that is too small can damage the sleeve during installation, while tubing that is too large may not recover tightly around the cable.

Material, wall thickness, shrink ratio, operating temperature, flame rating and voltage classification vary between heat-shrink product families. Those properties should not be assumed only from color and diameter. For lithium battery and EV assemblies, the tubing should be kept away from cell vents and from heating methods that can overheat nearby cells, BMS boards or plastic connector housings. A controlled hot-air tool is generally preferable to an open flame because it allows more even recovery and reduces the risk of burning insulation.

Choose this red heat-shrink tube by measuring the cable or component diameter before installation and checking the required recovered fit after shrinking. Also consider whether the tube must pass over a terminal, whether flexibility is required after recovery and whether the finished assembly needs a documented temperature, flame-retardancy or voltage rating. For polarity marking, use the red sleeve consistently with the wiring standard adopted in the pack or equipment.

Applications

• Battery pack wire insulation and polarity identification.

• Protection over soldered or crimped electrical joints.

• BMS, sensor and auxiliary-wire organization.

• EV, inverter, charger and UPS wiring harness finishing.

• General electrical repair, cable bundling and abrasion protection.

Installation Guide

Cut the tube cleanly to the required length and slide it into position before making any connection that would prevent the sleeve from passing over the cable. Center it over the area to be protected and apply heat gradually while moving the hot-air source so the tubing recovers evenly. Do not concentrate heat on one point or direct excessive heat toward lithium cells, PCB components or connector housings. Allow the sleeve to cool before bending or loading the cable, then inspect for splits, incomplete recovery or exposed conductor.

Why Choose ARB Accessories?

ARB Accessories focuses on lithium-battery, EV, energy-storage and battery-pack assembly components. The catalog brings together BMS boards, connectors, insulation materials, battery wiring, terminals, fuses, enclosures, testing equipment and assembly tools. For battery builders, repair workshops and OEM buyers, sourcing related components from one specialist catalog can make specification matching and procurement easier. Final suitability should still be checked against the exact battery design, equipment model and electrical requirements before installation.