The **WJM-1C4-R** is a specific type of **electromagnetic relay**. These components function as electrically operated switches, allowing a low-power signal to control a much higher-power circuit. Below is a detailed breakdown of its electronic characteristics and specifications. --- ### 1. General Specifications The WJM series is typically characterized by its compact design and high reliability for PCB (Printed Circuit Board) mounting. | Feature | Specification Details | | :--- | :--- | | **Component Type** | Electromagnetic Relay | | **Configuration** | SPDT (1 Form C) | | **Mounting Type** | Through-hole (PCB) | | **Termination** | Solder Pins | | **Contact Material** | Silver Alloy (often AgSnO2 or AgNi) | ### 2. Contact Configuration (1C) The "1C" in the part number signifies the contact arrangement: * **SPDT (Single Pole Double Throw):** This means the relay has one common terminal that can switch between two other terminals (Normally Open and Normally Closed). * **Form C:** A standard industry term for a change-over contact set. ### 3. Electrical Characteristics Relays like the WJM-1C4-R are designed to handle specific voltage and current loads. While exact ratings can vary by manufacturer batch, they generally fall into these ranges: * **Coil Voltage:** Usually available in 5V, 12V, or 24V DC (Check the specific sub-marking on the casing). * **Contact Rating:** Typically rated for **3A to 10A** at 125VAC or 30VDC. * **Insulation Resistance:** Minimum 100MΩ (at 500VDC). * **Dielectric Strength:** Usually 1,000VAC between open contacts and 1,500VAC between coil and contacts. ### 4. Internal Mechanics The device consists of four primary internal electronic/mechanical parts: 1. **Electromagnet (Coil):** A copper wire wound around an iron core. When energized, it creates a magnetic field. 2. **Armature:** A moving part that is attracted by the magnetic field. 3. **Spring:** Returns the armature to its original position when the current is removed. 4. **Contacts:** The physical points that open or close the electrical circuit. ### 5. Common Applications * **Home Appliances:** Control circuits for air conditioners or heaters. * **Office Automation:** Switching power in printers and copiers. * **Industrial Equipment:** Interfacing between microcontrollers (like Arduino/PLCs) and high-voltage motors or lights. --- ### Circuit Symbol Representation In a schematic, the WJM-1C4-R is represented as follows: ```text [Coil] [Switch] ---( )--- NC --/ -- COM NO -- ```