Based on the part number **OSH-SH-248DM3**, this component is a specific type of power relay manufactured by **OEG (a brand under TE Connectivity)**. It is widely used in home appliances and industrial control boards. ### 1. Part Number Breakdown Understanding the nomenclature helps identify its technical capabilities: | Code Segment | Meaning | Description | | :--- | :--- | :--- | | **OSH** | Series Type | Compact miniature power relay series. | | **SH** | Sealing | Sealed type (wash-tight), protected against environmental contaminants. | | **2** | Number of Poles | Indicates 2-pole configuration. | | **48** | Coil Voltage | Rated for **48V DC** operation. | | **D** | Coil Sensitivity | Standard sensitivity (approx. 720mW power consumption). | | **M** | Contact Form | Form A (Normally Open / NO). | | **3** | Contact Material | Silver Tin Oxide ($AgSnO_2$) or similar alloy for high inrush currents. | --- ### 2. Technical Specifications The OSASH248DM3 is designed for high-density PCB mounting where space is limited but high switching capacity is required. #### Coil Data (Input) * **Nominal Voltage:** 48V DC * **Coil Resistance:** Typically around $3,200 \Omega$ (varies by specific sub-batch). * **Operating Power:** Approximately 720mW. #### Contact Data (Output) * **Contact Arrangement:** 2 Form A (DPST-NO). * **Rated Current:** Typically 5A per pole (depending on the specific load type). * **Max Switching Voltage:** 250V AC / 30V DC. * **Contact Material:** $AgSnO_2$, which provides excellent anti-welding properties. --- ### 3. Key Applications Because of its 48V coil and sealed construction, this relay is commonly found in: * **HVAC Systems:** Controlling fans or small compressors. * **Industrial Equipment:** Used in PLC output modules. * **Communication Devices:** Power switching in telecom infrastructure. * **Home Appliances:** Washing machines and refrigerators for motor/heater control. --- ### 4. Schematic Representation Below is a simplified logic diagram for a 2-pole Normally Open relay: ```text [ Coil ] (Pin 1) (Pin 2) | | [=======] <-- 48V DC applied here [ Contacts ] Pole 1: (Pin 3) ---/ --- (Pin 4) [NO] Pole 2: (Pin 5) ---/ --- (Pin 6) [NO] ```