The **FRT-5Z-R** is a specific model of a **Miniature PCB Relay**, typically manufactured by companies like **Forward Relays**. It is widely used in telecommunications, security systems, and office automation due to its compact size and low power consumption. --- ### 1. Technical Specifications The following table summarizes the key electrical and mechanical characteristics of the FRT-5Z-R: | Feature | Specification | | :--- | :--- | | **Contact Form** | 1C (SPDT - Single Pole Double Throw) | | **Contact Rating** | 1A 24VDC / 0.5A 125VAC | | **Max Switching Power** | 30W / 62.5VA | | **Max Switching Voltage** | 60VDC / 125VAC | | **Coil Rated Voltage** | Typically 3V to 24V DC (Model dependent) | | **Coil Power Consumption** | ~150mW to 200mW (Sensitive type) | | **Dielectric Strength** | 1,000VAC (between coil and contacts) | | **Mechanical Life** | $1 \times 10^7$ operations | --- ### 2. Key Internal Components The FRT-5Z-R consists of several critical electronic and mechanical parts: * **Electromagnetic Coil:** A fine copper wire winding that generates a magnetic field when energized. * **Armature:** The moving part that reacts to the magnetic field to flip the switch. * **Stationary and Moving Contacts:** Usually made of silver alloys (AgNi or AgPd with Gold plating) to ensure low contact resistance and prevent oxidation. * **Yoke and Core:** Soft magnetic materials that direct the magnetic flux to the armature. * **Return Spring:** Ensures the armature returns to its original position (NC - Normally Closed) once power is removed. --- ### 3. Pinout Configuration The "Z" in the part number typically denotes the contact arrangement. For the FRT-5Z-R, the layout generally follows this structure: 1. **Coil Pins (2 pins):** Connected to the driving circuit (e.g., via a transistor). 2. **Common (COM):** The center terminal that switches between the other two. 3. **Normally Closed (NC):** Connected to COM when the relay is OFF. 4. **Normally Open (NO):** Connected to COM when the relay is ON. --- ### 4. Application Circuit Example To drive an FRT-5Z-R with a microcontroller (like an Arduino), a flyback diode is essential to protect against inductive spikes. ```cpp // Example: Basic Relay Trigger void setup() { pinMode(7, OUTPUT); // Connected to Base of NPN Transistor } void loop() { digitalWrite(7, HIGH); // Relay ON delay(1000); digitalWrite(7, LOW); // Relay OFF delay(1000); } ```