The **DSP1-DC24V-R** is a high-sensitivity, miniature power relay manufactured by Panasonic (formerly Matsushita). It belongs to the **DSP series**, known for its compact size, high switching capacity, and polarized design. --- ## 1. Technical Specifications The following table highlights the critical electrical and mechanical characteristics of the component: | Feature | Specification | | :--- | :--- | | **Contact Form** | 1 Form A 1 Form B (1a1b) / DPST | | **Nominal Coil Voltage** | 24V DC | | **Contact Rating (Resistive)** | 5A @ 250V AC / 5A @ 30V DC | | **Max. Switching Power** | 1250 VA / 150 W | | **Coil Power Consumption** | Approx. 300 mW | | **Terminal Type** | PC Board (Through-hole) | | **Sealing** | Sealed (Washable) | | **Coil Resistance** | 1,920 Ω | --- ## 2. Key Features and Meaning of "R" The part number suffix and internal design provide specific functionalities: ### The "R" Suffix In the Panasonic naming convention, the **"R"** usually denotes a **reversed pin association** or specific polarity configuration compared to the standard model. It ensures compatibility with specific PCB layouts where the coil or contact orientation needs to be mirrored. ### Polarized Magnet Structure The DSP series uses a **Permanent Magnet** in combination with an electromagnet. This results in: * **High Sensitivity:** Requires less power to actuate the coil (300mW). * **High Vibration/Shock Resistance:** The magnetic force holds the armature more securely than non-polarized relays. * **Directional Current:** Because it is polarized, the positive (+) and negative (-) leads to the coil must be connected correctly to operate. --- ## 3. Internal Schematic & Pinout The DSP1 variant typically features a **1a1b configuration**. This means: 1. **Form A (NO):** One "Normally Open" contact. 2. **Form B (NC):** One "Normally Closed" contact. When 24V DC is applied to the coil, the NC contact opens and the NO contact closes simultaneously. --- ## 4. Typical Applications Due to its 5A rating and compact footprint, this relay is commonly found in: * **Industrial Equipment:** PLC (Programmable Logic Controller) output modules. * **Consumer Electronics:** Air conditioner control boards and microwave ovens. * **Office Automation:** Printers, copiers, and power supply switching. * **Security Systems:** Control panels and alarm triggers. ---