The **GST220A20-R7B** is a high-reliability, 220W industrial-grade AC/DC power adapter manufactured by **Mean Well**. It is commonly used for telecommunications, industrial equipment, and high-end consumer electronics. --- ### 1. Key Technical Specifications | Parameter | Specification | | :--- | :--- | | **Output Voltage** | 20V DC | | **Output Current** | 11A | | **Rated Power** | 220 Watts | | **Input Voltage Range** | 85 ~ 264VAC (Universal) | | **Efficiency** | Up to 93.5% | | **Connector Type** | Power DIN 4-Pin with lock (R7B) | | **Operating Temperature** | -30 ~ +70°C | | **No Load Power Consumption** | < 0.15W | --- ### 2. Core Electronic Components & Design The internal architecture of the GST220A20-R7B is designed for energy efficiency and safety: * **Active PFC (Power Factor Correction):** It features a built-in active PFC circuit (PF > 0.94). This reduces harmonic current distortion and improves the efficiency of power drawn from the AC grid. * **Protection Circuitry:** * **Overload Protection:** Limits current output to prevent damage during a short circuit. * **Overvoltage Protection:** Shuts down the unit if the output exceeds ~21-27V. * **Over-temperature Protection:** Uses a thermistor to monitor internal heat, triggering a shutdown if safe limits are exceeded. * **EMI Filtering:** Includes a robust input filter stage to comply with **EN55032 Class B** standards, minimizing electromagnetic interference with other electronics. * **Class I Power Unit:** It is a 3-pole AC inlet (IEC320-C14) design, meaning it utilizes a safety ground (Earthing). --- ### 3. Connector Pinout (R7B Type) The "R7B" suffix refers to the specific 4-pin Power DIN connector. This is a locking connector designed to prevent accidental disconnection. | Pin Number | Assignment | | :--- | :--- | | **Pin 1 & 2** | + Vout (20V) | | **Pin 3 & 4** | - Vout (GND) | | **Shell** | FG (Frame Ground) | --- ### 4. Certifications This part is highly regarded due to its compliance with international standards: * **Level VI Efficiency:** Meets the latest energy-saving requirements (DoE Level VI). * **Safety Standards:** UL62368-1, TUV EN62368-1, and BSMI CNS14336.