The **WMS2-C2-R/Q** is a specific variant of a high-performance **Industrial Limit Switch** or **Safety Switch**, commonly associated with manufacturers like *Schmersal* or similar industrial automation brands. These devices are designed to detect the position of machine parts or to monitor the opening of safety guards. --- ### 1. Component Breakdown & Specifications The part number typically follows a modular nomenclature. Below is the technical breakdown of its electronic and mechanical characteristics: | Feature | Specification | Description | | :--- | :--- | :--- | | **Contact Type** | 2NC (Normally Closed) | Standard safety configuration for fail-safe circuits. | | **Switching Principle** | Creep Action | Slow-make, slow-break contact movement. | | **Material** | Metal or Heavy-duty Plastic | Designed for high mechanical stress environments. | | **Voltage Rating** | Up to 230V AC / 24V DC | Compatible with standard PLC inputs and safety relays. | | **Thermal Current** | 4A - 10A (Typical) | The maximum continuous current the contacts can carry. | | **Protection Class** | IP67 | Dust-tight and protected against temporary immersion in water. | --- ### 2. Key Electronic Features #### A. Positive Break (Force Disconnection) The "WMS" series usually features **Positive Break** contacts. Unlike a standard switch where a spring might fail, these contacts are physically forced apart by the actuator, ensuring the circuit opens even if the contacts have lightly welded together. #### B. Redundancy (2NC) The "2" in the part number indicates two independent NC (Normally Closed) contacts. This is critical for **Category 3 or 4 Safety Systems** (ISO 13849-1), allowing a safety controller to monitor for "Cross-wire shorts" or "Contact failure." #### C. Connector Interface (R/Q Suffix) * **Q:** Often denotes a **Quick Disconnect** (M12 or M8 connector) rather than a hard-wired cable gland. * **R:** Usually refers to the **Roller Plunger** or **Right-angle** orientation of the actuator head. --- ### 3. Application Use Cases 1. **Safety Gate Monitoring:** Ensuring a machine cannot start unless a door is closed. 2. **End-of-Travel Detection:** Stopping a motor or actuator when it reaches its physical limit. 3. **Position Sensing:** Detecting the presence of a workpiece in an automated assembly line. --- ### 4. Wiring Diagram (Conceptual) ```mermaid graph LR A[Power +24V] --> B[Contact 11-12 NC] B --> C[Safety Relay Input 1] D[Power +24V] --> E[Contact 21-22 NC] E --> F[Safety Relay Input 2] ``` *Note: Always verify with the specific manufacturer’s datasheet (e.g., Schmersal, Omron, or Siemens) as internal contact arrangements can vary slightly by production year.*