The **W2TS-311-R** is a specific model within the series of industrial limit switches, typically associated with brands like **Azbil (formerly Yamatake)** or similar industrial control manufacturers. It is a high-precision, horizontal-type limit switch designed for position detection in machinery. --- ### 1. Key Technical Specifications The electrical and mechanical characteristics are critical for integration into control circuits. | Feature | Specification | | :--- | :--- | | **Contact Configuration** | Single Pole, Double Throw (SPDT) | | **Actuator Type** | Top Roller Plunger | | **Rated Voltage** | 125V AC / 250V AC | | **Rated Current** | Typically 5A to 10A (depending on load type) | | **Terminal Type** | Screw Terminals (M3) | | **Protection Rating** | IP67 (Dust-tight and immersion-resistant) | | **Operating Force** | ~4.90 N to 11.8 N | --- ### 2. Internal Electronic Structure While a limit switch is primarily a mechanical device, its "electronic" identity is defined by its contact logic: * **COM (Common):** The input terminal where the power source is connected. * **NC (Normally Closed):** The circuit is complete when the actuator is at rest. * **NO (Normally Open):** The circuit is open until the roller plunger is depressed. * **Snap-Action Mechanism:** Internally, it uses a spring-loaded toggle mechanism. This ensures that the transition between NC and NO happens instantly at a specific "trip point," preventing electrical arcing and ensuring high repeatability. --- ### 3. Connection Diagram Below is a representation of how the terminals are typically wired in a control circuit: ```text [ Terminal Block ] | /-------+-------\ | (1) (2) (3) | | COM NC NO | \-------+-------/ | (Mechanical Actuator) ``` --- ### 4. Typical Applications * **Position Sensing:** Detecting the arrival of a machine carriage or a robot arm. * **Safety Interlocks:** Ensuring a protective door is closed before a motor starts. * **End-of-Travel Limits:** Cutting power to a motor if a component moves too far in one direction. --- ### 5. Part Number Breakdown (W2TS-311-R) * **W2TS:** Series designation (High-precision/Compact). * **311:** Defines the actuator style (Top Roller Plunger) and mounting hole spacing. * **R:** Often denotes the specific terminal orientation or a "RoHS" compliance indicator depending on the manufacturer's specific catalog suffix.