The **STB03-R-4** is a specialized electronic component primarily categorized as an **ID Marker/Wire Marker Sleeve**. It is widely used in industrial automation and electrical panel building to identify cables and wires for maintenance and organization. Below is a detailed breakdown of its specifications and properties. --- ### 1. General Specifications The STB (Snap-on) series is designed for permanent marking of wires that have already been terminated or connected. | Property | Description | | :--- | :--- | | **Manufacturer** | Often produced by TE Connectivity (Raychem) or similar industrial brands | | **Part Number Structure** | **STB** (Series) - **03** (Size) - **R** (Color: Red) - **4** (Legend: Number 4) | | **Mounting Type** | Snap-on (Clip-on) | | **Material** | Polyamide 6.6 (Nylon) | | **Operating Temperature** | -40°C to +105°C | --- ### 2. Physical & Material Characteristics The component is engineered to withstand harsh industrial environments. * **Snap-on Mechanism:** It features a "C" shape profile with a lateral expansion capability. This allows the technician to clip the marker onto a wire without disconnecting the terminal. * **Wand Applicator Compatibility:** Size 03 markers are typically supplied on an applicator wand (usually 30 markers per wand) to allow for quick, tool-free installation. * **Grip Strength:** The internal design includes small "teeth" or a specific geometry that prevents the marker from rotating or sliding along the wire once snapped into place. * **Flammability Rating:** Usually UL94 V2 rated, ensuring high resistance to ignition. --- ### 3. Dimensions and Sizing (Size 03) The "03" designation refers to the specific cable diameter range the marker can accommodate. | Parameter | Metric Value | | :--- | :--- | | **Wire Diameter Range** | 1.90 mm to 2.60 mm | | **Marker Length** | ~3.0 mm | | **Compatible Wire Gauge** | Approx. 20 - 16 AWG (Depending on insulation thickness) | --- ### 4. Color and Legend Coding The specific part number **STB03-R-4** follows the international color-coding standard for resistors and electrical components: * **Color (R):** Red. In many industrial standards, "Red" is the designated color for the number **2**, however, in the STB series, "R" stands for the physical color of the plastic sleeve. * **Legend (4):** The number **4** is printed on the sleeve (usually in black or white ink) to identify the specific circuit or wire index. --- ### Summary of Use Cases 1. **Post-Termination Labeling:** Adding identification to wires after a control panel has been wired. 2. **Maintenance:** Replacing illegible tags without breaking electrical contacts. 3. **High-Density Wiring:** Used in PLCs and relay logic where space is limited and clear numbering is essential.