The **JFR2-4M1-R** is a specific electronic component, typically categorized as a **Limit Switch** or a **Magnetic Proximity Sensor**, often utilized in industrial automation, pneumatic cylinder position sensing, and security systems. Below is a breakdown of its technical specifications and electronic characteristics. --- ### 1. Technical Specifications The following table highlights the core electrical and physical parameters of the JFR2-4M1-R: | Parameter | Specification Details | | :--- | :--- | | **Switch Type** | Magnetic Reed / Proximity Switch | | **Contact Form** | Normally Open (NO) | | **Operating Voltage** | 5V – 240V AC/DC (Common Range) | | **Switching Current** | 100mA Max | | **Contact Rating** | 10W Max | | **Voltage Drop** | 2.5V Max | | **Indicator** | Red LED (Standard for status feedback) | | **Connection** | 2-Wire Lead | --- ### 2. Internal Electronic Structure The device operates on the principle of **magnetic induction**. Here is the internal functional breakdown: 1. **Reed Switch:** The heart of the part consists of two ferromagnetic blades enclosed in a glass envelope. When a magnetic field (from a cylinder piston or external magnet) approaches, the blades pull together to close the circuit. 2. **Protection Circuit:** Often includes a Zener diode or an RC snubber circuit to protect the reed contacts from voltage spikes when switching inductive loads. 3. **LED Indicator:** A low-power LED is wired in series with the switch to provide visual confirmation that the circuit is closed and the sensor has been triggered. --- ### 3. Wiring Configuration Since this is typically a **2-wire** device, it is wired in series with the load. Use the following logic for integration: ```markdown [Power Source (+)] ----> [Brown Wire] (Sensor) [Blue Wire] ----> [Load/PLC Input] ----> [Power Source (-)] ``` > **Note:** Because there is a voltage drop (approx. 2.5V) across the internal LED, ensure the controller (PLC) or relay can still trigger at the slightly reduced voltage. --- ### 4. Common Applications * **Pneumatic Cylinders:** Mounted on the "T-slot" of a cylinder to detect the end-of-stroke position of the piston. * **Security Systems:** Detecting the opening/closing of metallic doors or gates. * **Limit Sensing:** Used as a non-contact safety limit in CNC or conveyor systems. ---