The **SVB-KD-R/Q** is a specific model within a series of industrial control switches, typically manufactured by companies like **Eaton (Moeller)**. It is primarily categorized as a **Main Switch / Emergency Stop** assembly used in industrial machinery. Below is a breakdown of its electronic and mechanical parts, specifications, and functions. --- ### 1. Component Breakdown The SVB-KD-R/Q is not a single electronic component but an **assembly** of several parts designed to work together for circuit isolation and safety. | Component | Description | Function | | :--- | :--- | :--- | | **Rotary Handle** | Red/Yellow color scheme (Emergency Stop standard). | Provides the user interface to turn the power ON or OFF. | | **Switch Body** | The internal contact block (often a P1 or T0 series). | Contains the heavy-duty copper contacts that break the electrical circuit. | | **Locking Ring** | A yellow ring capable of accepting multiple padlocks. | Ensures "Lockout-Tagout" (LOTO) safety compliance during maintenance. | | **Shaft / Coupler** | The metal or plastic rod connecting the handle to the switch. | Transfers the torque from the handle through the cabinet door to the internal switch. | --- ### 2. Technical Specifications These parts are engineered to handle high-voltage and high-current industrial loads. * **Rated Operational Voltage ($U_e$):** Typically up to **690V AC**. * **Rated Uninterrupted Current ($I_u$):** Usually ranges from **20A to 32A** (depending on the specific sub-model). * **Ingress Protection:** Usually **IP65**, meaning it is dust-tight and protected against water jets. * **Mounting Type:** Rear mounting (KD designation often refers to "Kupplungsantrieb" or coupling drive for cabinet installation). --- ### 3. Electronic Functionality While the device is primarily electromechanical, its electronic role in a system is critical: 1. **Galvanic Isolation:** It provides a physical air gap between the power source and the machinery, ensuring no current can leak through when the switch is in the "OFF" position. 2. **Emergency Stop (E-Stop):** The red handle on a yellow background signifies that it is rated for emergency disconnection under load (AC-23A or AC-3 categories). 3. **Short-Circuit Protection:** It is designed to withstand specific peak let-through currents (kA) until a fuse or circuit breaker upstream trips. --- ### 4. Wiring and Integration The switch body typically features **Screw Terminals**. In a standard 3-phase system, the wiring follows this logic: * **L1, L2, L3 (Input):** Connected to the main power supply. * **T1, T2, T3 (Output):** Connected to the motor controller or machine load. * **Auxiliary Contacts (Optional):** Some versions include a smaller "NO" or "NC" contact used to send a signal to a PLC (Programmable Logic Controller) indicating the switch status. ---