The **SL10-M2KTN-R** is a specific model of an **Industrial Limit Switch** (or Safety Limit Switch) manufactured by **Bernstein AG**. These components are critical for motion control, safety interlocking, and position detection in automated machinery. Below is a breakdown of its electronic and mechanical specifications. --- ## 1. Technical Specifications The "SL" series is designed for heavy-duty applications. The "M2KTN" suffix defines the contact configuration and head type. | Feature | Specification | | :--- | :--- | | **Contact Configuration** | 2 NC (Normally Closed) + 1 NO (Normally Open) | | **Switching Principle** | Snap-action (Slow action variants exist, check specific data sheet) | | **Rated Operational Voltage (Ue)** | Max 240V AC | | **Conventional Thermal Current (Ithe)** | 10A | | **Protection Class** | IP65 / IP67 (Dust tight and water resistant) | | **Housing Material** | Thermoplastic (Impact resistant) | | **Actuator Type** | Roller Plunger / Lever (Part of the 'KTN' series) | --- ## 2. Core Electronic Components ### A. Contact Blocks (2NC / 1NO) The internal electronics consist of gold or silver-plated contacts. * **NC (Normally Closed):** These are used for safety circuits. When the switch is actuated, these contacts open, cutting power to the machine. * **NO (Normally Open):** These are typically used for signaling/feedback (e.g., telling a PLC that a door is closed). * **Galvanic Isolation:** The contacts are galvanically separated, meaning there is no electrical leakage between the NC and NO circuits. ### B. Termination / Wiring * **Screw Terminals:** The unit uses internal screw terminals for secure wiring. * **Cable Entry:** Usually features an M20 x 1.5 threaded hole for cable glands to maintain the IP rating. ### C. Forced Disconnection (Safety) The electronic design includes a **positive opening mechanism**. This means that even if the contacts were to weld together due to a short circuit, the mechanical force of the actuator is strong enough to physically break the connection, ensuring the machine stops safely. --- ## 3. Application Use Cases 1. **Safety Guard Monitoring:** Ensuring a machine cannot start while a safety door is open. 2. **End-of-Travel Detection:** Stopping a motor or actuator when it reaches a specific physical limit. 3. **Position Sensing:** Detecting the presence of a workpiece on a conveyor belt. --- ## 4. Part Number Breakdown (Bernstein Logic) | Code | Meaning | | :--- | :--- | | **SL** | Safety Limit Switch Series | | **10** | Specific body size/mounting pattern | | **M2** | Contact type (2NC / 1NO Configuration) | | **KTN** | Actuator head style (e.g., Plastic Roller Plunger) | | **R** | Specific reset or orientation feature |