The **SVB-1B-R/K** is a specific model identifier typically associated with **Safety Limit Switches** or **Emergency Stop (E-Stop) control stations**, often manufactured by companies like **Schlegel** or within specific industrial automation series. Below is a technical breakdown of its electronic and mechanical components. --- ### 1. Technical Specifications The "SVB" series generally refers to safety-related control units. The suffix "R/K" usually denotes the physical configuration (Red button/Key release or similar safety variant). | Feature | Specification | | :--- | :--- | | **Component Type** | Emergency Stop Pushbutton / Control Unit | | **Contact Configuration** | Typically 1 NC (Normally Closed) or 2 NC | | **Switching Voltage** | 250V AC / DC | | **Thermal Current ($I_{th}$)** | 10A - 16A (depending on contact block) | | **Mounting Diameter** | 22.3 mm (Standard) | | **IP Rating** | IP65 or IP67 (Dust-tight and water-resistant) | | **Actuation Method** | Mushroom Head (Pull-to-reset or Twist-to-reset) | --- ### 2. Key Electronic & Mechanical Parts #### A. Contact Blocks The internal switching mechanism usually consists of modular contact blocks. * **Safety Function:** These use "Positive Opening" operations, meaning the contacts are forced apart mechanically if the button is pressed, ensuring the circuit breaks even if the contacts try to weld together. * **Material:** Silver alloy (AgNi) is commonly used for high conductivity and oxidation resistance. #### B. The Actuator (Mushroom Head) * **Color Coding:** The "R" in the part number signifies **Red**, the international standard for emergency stops. * **Locking Mechanism:** Once pressed, the unit mechanically locks in the "OFF" position. It requires a manual action (rotation or pulling) to reset the electrical circuit. #### C. Housing and Terminals * **Terminals:** Usually screw-type terminals designed to accept wire gauges between 0.5mm² to 2.5mm². * **Illumination (Optional):** Some versions include an integrated LED ring or bulb holder to indicate the status of the switch or the machine's power state. --- ### 3. Wiring Logic The SVB-1B-R/K is integrated into a safety loop (Safety Relay). ```mermaid graph LR Power[Power Source] --> Switch[SVB-1B-R/K NC Contact] Switch --> Relay[Safety Monitoring Relay] Relay --> Motor[Machine Motor/Load] ``` * **NC (Normally Closed):** In a healthy state, the circuit is closed. * **Emergency Event:** Pressing the button opens the NC contact, interrupting the signal to the Safety Relay, which immediately cuts power to the machinery. --- ### 4. Typical Applications 1. **Industrial Conveyors:** To stop the line in case of a jam or hazard. 2. **CNC Machines:** Manual override for immediate spindle/axis stoppage. 3. **Control Panels:** Standard E-Stop interface for PLC-controlled systems.