The **RST4S-RKT4S-703SW** is a high-performance industrial automation cable assembly manufactured by **Lumberg Automation** (a Belden brand). This specific part number represents a double-ended cordset typically used for sensor and actuator connections in harsh environments. --- ### 1. Part Number Breakdown Understanding the electronic specifications requires decoding the nomenclature: | Component Code | Description | | :--- | :--- | | **RST 4S** | Male M12 connector, 4-pole, straight, S-coding (Power). | | **RKT 4S** | Female M12 connector, 4-pole, straight, S-coding (Power). | | **703** | Cable jacket material (typically PUR - Polyurethane) and color (Black). | | **SW** | Indicates the jacket color is specifically Black (Schwarz). | --- ### 2. Electrical & Technical Specifications These parts are designed for AC power applications rather than standard low-voltage data. | Property | Value/Specification | | :--- | :--- | | **Rated Voltage** | 630 V AC | | **Rated Current** | 12 A (at 40°C) | | **Coding** | S-Coded (prevents mismatching with data/signal cables) | | **Number of Poles** | 4 (3 + PE / Earth) | | **Contact Resistance** | ≤ 5 mΩ | | **Insulation Resistance** | > 10^9 Ω | --- ### 3. Material and Environmental Construction The "703" designation refers to the cable's physical robustness: * **Conductor Cross-section:** Usually $1.5 \text{ mm}^2$ copper wires. * **Jacket Material:** **PUR (Polyurethane)**. This material is halogen-free, resistant to oils, coolants, and microbes, making it ideal for CNC machines or robotic arms. * **IP Rating:** **IP65, IP67, or IP69K** when properly mated and locked. * **Temperature Range:** * Fixed: $-40^\circ\text{C}$ to $+90^\circ\text{C}$ * Flexible: $-30^\circ\text{C}$ to $+90^\circ\text{C}$ --- ### 4. Key Electronic Features * **S-Coding:** This is a safety feature. The physical shape of the connector ensures you cannot plug a high-voltage power cable into a low-voltage sensor port (like A-coded or B-coded). * **Integrated PE (Protective Earth):** One of the four poles is specifically designed for grounding to ensure electrical safety in industrial machinery. * **Shielding:** While many 703 series cables are unshielded, the "SW" variant is built for high-current power transmission where electromagnetic compatibility (EMC) is managed by the physical separation of power and signal lines. --- ### 5. Common Applications * **AC Motors:** Powering small three-phase or single-phase motors. * **Frequency Inverters:** Connecting drive controllers to peripheral equipment. * **Power Distribution:** Daisy-chaining power across industrial modules.