The **FSE-1A5-R** is a specific electronic component, typically categorized as a **Reed Sensor** or a **Proximity Switch**. These devices are used to detect the presence of a magnetic field to open or close an electrical circuit. ### 1. Key Technical Specifications Below are the primary electrical and physical characteristics of the FSE-1A5-R: | Feature | Specification | | :--- | :--- | | **Contact Form** | Form A (SPST-NO: Single Pole Single Throw - Normally Open) | | **Switching Voltage** | Max 200V DC | | **Switching Current** | Max 0.5A | | **Power Rating** | Max 10VA (Watts) | | **Contact Resistance** | < 150 mΩ | | **Operating Temperature** | -20°C to +85°C | | **Termination Style** | Wire Leads / Solder Tabs | --- ### 2. Functional Description The device operates on the principle of magnetism. Inside the plastic housing is a **Reed Switch**, which consists of two ferromagnetic blades (reeds) hermetically sealed in a glass envelope. * **Non-Contact Operation:** When a permanent magnet or an electromagnet comes within the "sensing range," the magnetic flux causes the internal reeds to attract each other and touch, completing the circuit. * **Normally Open (NO):** In its default state (without a magnet nearby), the circuit is broken. It only conducts electricity when triggered. --- ### 3. Common Applications Due to its reliability and protection from environmental factors, the FSE-1A5-R is used in several industries: * **Security Systems:** Detecting when a door or window is opened. * **Industrial Automation:** Position sensing for hydraulic cylinders or robotic arms. * **Automotive:** Seatbelt buckle detection or fluid level sensing. * **Consumer Electronics:** Counting rotations in fitness equipment or lid-closure detection in laptops. --- ### 4. Implementation Example To use this in a basic Arduino or microcontroller project, you would treat it like a standard push-button. ```cpp const int sensorPin = 2; // Connect FSE-1A5-R to Pin 2 void setup() { pinMode(sensorPin, INPUT_PULLUP); // Use internal pull-up resistor Serial.begin(9600); } void loop() { int sensorState = digitalRead(sensorPin); if (sensorState == LOW) { Serial.println("Magnet Detected: Circuit Closed"); } else { Serial.println("No Magnet: Circuit Open"); } delay(100); } ```