The **3SBP200-R** is a specific type of electronic component—specifically a **High-Voltage, Slow-Blow Ceramic Tube Fuse**. It is widely used in power supplies, industrial equipment, and consumer electronics where high breaking capacity and protection against transient surges are required. --- ### 1. Key Technical Specifications The part number "3SBP200-R" follows a specific naming convention (likely Bel Fuse or a compatible manufacturer). Here are the primary specifications: | Parameter | Value | | :--- | :--- | | **Current Rating** | 200 mA (0.2 Amps) | | **Voltage Rating** | 250V AC | | **Fuse Type** | Slow-Blow (Time-Delay / Time-Lag) | | **Body Material** | Ceramic (High Breaking Capacity) | | **Form Factor** | 6.3mm x 32mm (1/4" x 1-1/4") | | **Termination** | Axial Lead (Pigtail) - denoted by "P" in many series | | **RoHS Compliant** | Yes (denoted by the "-R" suffix) | --- ### 2. Physical Characteristics Unlike standard glass fuses, the **3SBP** series uses a ceramic body. * **Ceramic Body:** Provides higher "Interrupting Ratings." This means if a massive short circuit occurs, the ceramic body will not shatter or explode like glass might. * **Axial Leads:** The "P" in the middle of the part number usually signifies that this is a **Pigtail** fuse. It is designed to be soldered directly onto a Printed Circuit Board (PCB) rather than being inserted into a fuse clip. * **Sand Filling:** These fuses are often filled with high-purity silica sand to quench the internal arc when the fuse blows. --- ### 3. "Slow-Blow" (Time-Delay) Functionality The 3SBP200-R is a **Type T** (Time-lag) fuse. * **Inrush Currents:** It is designed to ignore brief spikes in current (such as when a motor starts or a capacitor charges). * **Thermal Trip:** It will only "blow" if the current exceeds 200mA for a sustained period or if there is a massive overcurrent event. * **Symbol:** Usually marked with a "T" (e.g., T200mA L 250V). --- ### 4. Common Applications * **Power Supplies:** Protecting the primary (AC) side of low-power transformers. * **LED Drivers:** Guarding against internal component failure. * **Industrial Controllers:** Used on PCBs where space is limited and a permanent (soldered) protection solution is needed. --- ### 5. Identification Code Breakdown If we break down the part number: 1. **3S:** Refers to the series (Time-Delay, Ceramic body). 2. **B:** Manufacturer-specific code (often relating to packaging or physical dimensions). 3. **P:** Pigtail/Axial Leads. 4. **200:** The current rating (200mA). 5. **-R:** RoHS (Lead-free) compliance.