The **SVB-1F-R/K** is a specific model within a series of safety interlock switches, typically manufactured by companies like **IDEC** or similar industrial automation brands. It is part of a "Key Interlock" system used to ensure machinery is de-energized before access is granted to hazardous areas. --- ### 1. General Specifications The SVB-1F-R/K is an **Electro-Mechanical Safety Interlock**. It functions by bridging the gap between electrical control circuits and physical mechanical locking. | Component | Specification Details | | :--- | :--- | | **Model Type** | Solenoid Interlock Switch (Base Unit) | | **Operation Type** | Spring Lock / Solenoid Release | | **Key Type** | Standard Mechanical Key (R/K designation) | | **Housing Material** | Die-cast Aluminum or Reinforced Plastic (Model dependent) | | **Contact Configuration** | Typically 1NO + 1NC or 2NC | --- ### 2. Core Electronic Components The internal "electronics" of the SVB-1F-R/K are primarily electromechanical components designed for high reliability and safety compliance. #### A. The Solenoid (Actuator) The heart of the unit is a **Solenoid Coil**. * **Function:** When energized (or de-energized, depending on safety logic), the magnetic field moves a plunger that physically locks or unlocks the mechanical key. * **Voltage:** Usually available in **24V DC** (standard for PLCs) or **110V/230V AC**. #### B. Monitoring Contacts (Micro-switches) These are the internal switches that signal the status to the Control System (PLC). * **Solenoid Monitoring:** Tells the system if the lock is engaged. * **Door/Key Monitoring:** Tells the system if the key is inserted and the gate is closed. #### C. Built-in LED Indicators Most units in this series include internal or external LED status indicators: * **Green:** System Locked / Machine Running. * **Red:** System Unlocked / Machine Halted. --- ### 3. Wiring and Integration In a typical industrial circuit, the SVB-1F-R/K is wired into a **Safety Relay** or a **Safety PLC**. ```mermaid graph LR A[Safety PLC] -->|24V Signal| B(Solenoid Coil) B --> C{Mechanical Lock} D[Feedback Contacts] -->|Status Signal| A ``` #### Electrical Safety Ratings * **Insulation Voltage (Ui):** 250V to 600V. * **Thermal Current (Ith):** Typically 10A. * **Protection Class:** IP67 (Dust tight and protected against immersion). --- ### 4. Key Safety Logic The "R/K" variant often refers to the **Locking Mechanism Logic**: 1. **Spring Lock (Power-to-Unlock):** The unit stays locked by mechanical spring pressure. You must apply electricity to the solenoid to unlock it. This is preferred for safety in case of power failure. 2. **Solenoid Lock (Power-to-Lock):** The unit stays locked only when electricity is applied. ---