The **WJM-103-R/Q** refers to a specific series of miniature high-frequency power relays. These components are primarily used for switching high-power loads in industrial, automotive, and telecommunications applications. Below is a breakdown of the electronic specifications and characteristics for this part series. ### 1. General Specifications The "R/Q" suffix usually denotes specific variations in sealing (flux-proof vs. wash-tight) or contact materials. | Feature | Specification (Typical) | | :--- | :--- | | **Contact Form** | 1 Form A (SPST-NO) or 1 Form C (SPDT) | | **Contact Material** | Silver Alloy (AgSnO2 or AgCdO) | | **Rated Load (Resistive)** | 10A to 20A @ 250VAC / 30VDC | | **Max Switching Voltage** | 250VAC / 110VDC | | **Coil Nominal Voltage** | 3VDC to 48VDC (Commonly 12V or 24V) | | **Coil Power Consumption** | Approx. 0.36W to 0.45W | --- ### 2. Internal Components & Pinout The internal construction consists of an electromagnetic coil, an armature, and contact points. * **Coil (Input):** When DC voltage is applied, it creates a magnetic field that moves the armature. * **Contacts (Output):** * **Common (COM):** The moving part of the switch. * **Normally Open (NO):** Connected to COM only when the coil is energized. * **Normally Closed (NC):** (In Form C models) Connected to COM when the coil is idle. --- ### 3. Key Electronic Characteristics #### A. Dielectric Strength This relay is designed to isolate low-voltage control circuits from high-voltage power circuits. * **Between Open Contacts:** ~750VAC to 1,000VAC per minute. * **Between Coil and Contacts:** ~1,500VAC to 2,500VAC per minute. #### B. Life Expectancy * **Electrical Life:** ~100,000 operations (at rated load). * **Mechanical Life:** ~10,000,000 operations (no load). #### C. Environmental Sealing (The R/Q Designations) * **Type R:** Often indicates a **Flux-proof** construction, suitable for standard soldering where the relay isn't submerged in cleaning solvents. * **Type Q:** Often indicates a **Wash-tight (Sealed)** construction, allowing the PCB to be washed after soldering without liquid entering the relay housing. --- ### 4. Sample Schematic (1 Form C) ```text (Coil) [Pin 1] ----( Coil )---- [Pin 2] (Contacts) [NC] ----| |--- [COM] [NO] ----| ``` --- ### 5. Common Applications * **Home Appliances:** Air conditioners, microwave ovens, and heaters. * **Industrial Control:** PLC output modules and motor control. * **Automotive:** Power windows, central locking, and lighting control. ---