The **SVB-4DW-R** is a specific electronic component typically categorized as a **Vandal-Proof Emergency Push Button Station** (often associated with security systems and elevator controls). Below is a detailed breakdown of its electronic parts and technical specifications. --- ## 1. Core Component Breakdown The device is an assembly of several critical electronic and mechanical parts designed for high-durability environments. | Component | Description | Function | | :--- | :--- | :--- | | **Actuator** | Large "Mushroom" style red button | The physical interface used to trigger the circuit. | | **Contact Block** | DPST (Double Pole Single Throw) | The electrical switch mechanism (usually 1NO/1NC or 2NC). | | **LED Indicator** | Integrated 12/24V DC LED | Provides visual feedback/status illumination. | | **Housing** | Die-cast Aluminum / Stainless Steel | Provides electromagnetic shielding and physical protection. | | **Terminal Block** | Screw-down connectors | The interface for wiring the device to the control panel. | --- ## 2. Technical Specifications These parameters define the electronic limits and operating environment of the SVB-4DW-R: ### Electrical Ratings * **Switching Voltage:** Typically rated up to 250V AC / 24V DC. * **Current Rating:** 5A to 10A (depending on the specific contact block model used). * **Illumination:** Red LED Ring or Center Dot, usually requiring a 12V or 24V DC power supply. ### Mechanical & Environmental * **Ingress Protection:** **IP65 or IP66** (Waterproof and dust-tight). * **Impact Rating:** **IK10** (Vandal-resistant against high-energy impacts). * **Operating Temp:** -25°C to +70°C. --- ## 3. Circuit Configuration The "4DW" suffix often refers to the specific wiring configuration. Most SVB series buttons utilize a **redundant circuit** design: 1. **Normally Closed (NC) Loop:** Used for the emergency stop trigger. Breaking this circuit immediately halts the connected machinery or alerts the security panel. 2. **Normally Open (NO) Loop:** Often used to trigger an external siren or a secondary notification system when the button is pressed. 3. **LED Circuit:** Wired independently to ensure the button remains visible even if the main control circuit is severed. --- ## 4. Key Features for Electronics Designers * **Latch Mechanism:** The "R" usually denotes "Reset." This means the button locks in the "pressed" position and requires a twist or key to release, preventing accidental restarts. * **Gold-Plated Contacts:** Often used in these models to prevent oxidation and ensure low-resistance switching in low-voltage logic circuits. ---