The **LMS-B4-R** is an electronic component primarily classified as a **Limit Switch** or a **Micro Switch**, often used in industrial control systems, CNC machinery, and automation. Below is a detailed breakdown of its electronic characteristics and technical specifications. --- ## 1. Core Technical Specifications The "LMS" series typically follows a standard form factor. The electronic ratings define the maximum current and voltage the internal contacts can handle without failing. | Feature | Specification (Typical) | | :--- | :--- | | **Switch Type** | Micro Switch / Limit Switch | | **Circuit Configuration** | SPDT (Single Pole Double Throw) | | **Current Rating** | 5A to 10A (Load dependent) | | **Voltage Rating (AC)** | 125V / 250V AC | | **Voltage Rating (DC)** | 12V / 24V DC | | **Terminal Type** | Solder or Quick Connect Terminals | --- ## 2. Terminal Identification The LMS-B4-R features three primary connection points. Understanding these is critical for proper circuit integration: 1. **COM (Common):** The input terminal where the power source is connected. 2. **NC (Normally Closed):** The circuit is complete when the switch is at rest (not pressed). 3. **NO (Normally Open):** The circuit is open when at rest and completes only when the lever is pressed. --- ## 3. Physical & Mechanical Parts The "B4-R" suffix usually denotes the specific actuator style. * **Actuator (The "R"):** Generally indicates a **Roller Lever**. The roller reduces friction and wear when the switch is triggered by a moving cam or mechanical part. * **Housing:** Typically made of high-grade phenolic or thermoplastic resin for electrical insulation. * **Contacts:** Usually made of silver alloy to ensure high conductivity and resistance to arcing. * **Internal Spring:** A snap-action mechanism that ensures a rapid transition between contacts, preventing electrical "chatter." --- ## 4. Application Logic Because it is a **Limit Switch**, it is electronically used in two main ways: ### Safety Interlock Connected to the **NC** terminal. If a machine door is opened or a part moves too far, the switch is triggered, breaking the circuit and stopping the machine immediately. ### Position Detection Connected to the **NO** terminal. When a mechanical part (like a 3D printer axis) hits the roller, the circuit closes, sending a signal to the microcontroller (like an Arduino or PLC) that the "Home" position has been reached. ---