The **RSR-04-R** is an **Ultra-Miniature Sensitive Relay** typically used in PCB (Printed Circuit Board) applications where space is limited and high sensitivity is required. It is commonly manufactured by brands like **Forward Relay** or equivalent industrial component suppliers. --- ### ## Technical Specifications Below is a breakdown of the core electronic characteristics of the RSR-04-R: | Parameter | Specification (Typical) | | :--- | :--- | | **Contact Form** | 1 Form C (SPDT - Single Pole Double Throw) | | **Coil Voltage (Nominal)** | 5V DC (Common for "04" series, though varies by suffix) | | **Contact Rating** | 1A at 125VAC / 2A at 30VDC | | **Max Switching Power** | 62.5VA / 60W | | **Coil Sensitivity** | High Sensitivity (Approx. 150mW - 200mW) | | **Dimensions** | Approx. 15.5mm x 10.5mm x 11.5mm | | **Terminal Type** | PCB Through-hole | --- ### ### Key Electronic Components & Features 1. **Coil System**: The "Sensitive" designation means the electromagnetic coil is wound to actuate the switch with very low current. This makes it ideal for driving directly from integrated circuits (ICs) or microcontrollers via a small transistor. 2. **Contact Materials**: Usually gold-clad silver or silver alloy. The gold plating ensures low contact resistance, which is vital for switching low-level signals without oxidation issues. 3. **Insulation Resistance**: Typically rated at 100MΩ (at 500VDC), ensuring electrical isolation between the control circuit (coil) and the load circuit (contacts). 4. **Dielectric Strength**: Capable of withstanding roughly 500VAC to 1000VAC between open contacts and between coil and contacts, protecting against voltage spikes. --- ### ### Application Use Cases * **Telecommunications**: Switching signal lines in modems or phone systems. * **Security Systems**: Controlling low-power sensors or alarm indicators. * **Office Automation**: Used in printers and copiers for logic-level switching. * **Consumer Electronics**: Ideal for battery-operated devices due to its low power consumption. --- ### ### Typical Connection Diagram (Pinout) ```text (Bottom View) +----------------+ | (1) (2) | (1) & (2): Coil Pins | | | (3) (4) | (3): Common (COM) | (5) | (4): Normally Closed (NC) +----------------+ (5): Normally Open (NO) ```