The **10AP-350-R** is a specific electronic component primarily known as a **radial leaded resettable fuse** (also known as a Polymeric Positive Temperature Coefficient or **PPTC** device). These are commonly used for overcurrent protection in various electronic circuits. --- ### 1. Key Technical Specifications The part number typically follows a standard industry naming convention for PPTC fuses. Below are the estimated specifications based on the "350" series nomenclature: | Specification | Value (Typical) | | :--- | :--- | | **Hold Current ($I_{hold}$)** | 3.50 Amperes | | **Trip Current ($I_{trip}$)** | 7.00 Amperes | | **Maximum Voltage ($V_{max}$)** | 16V - 30V (Application dependent) | | **Maximum Current ($I_{max}$)** | 40A - 100A | | **Mounting Type** | Through-Hole (Radial Leads) | | **RoHS Status** | Compliant (Indicated by "-R") | --- ### 2. Physical Characteristics * **Form Factor:** Small, rectangular, or circular disk coated with flame-retardant epoxy polymer. * **Terminals:** Two tin-plated radial leads for soldering onto a Printed Circuit Board (PCB). * **The "-R" Suffix:** Usually denotes **RoHS Compliance** (Lead-free) or, in some manufacturer catalogs, **Tape & Reel** packaging. --- ### 3. Functional Operation A PPTC device like the 10AP-350-R works differently than a standard one-time fuse: 1. **Normal State:** The device has low resistance, allowing current to flow to the load. 2. **Fault State:** If an overcurrent or short-circuit occurs, the internal polymer heats up rapidly. 3. **Tripped State:** The heat causes the polymer to expand, breaking the conductive paths and increasing resistance dramatically, effectively "opening" the circuit. 4. **Reset State:** Once the power is removed and the fault is cleared, the device cools down, the polymer contracts, and the resistance returns to a low state. --- ### 4. Common Applications Due to its 3.5A hold current, this part is frequently found in: * **Computing:** USB port protection and motherboard power rails. * **Automotive:** Protection for small motors, sensors, and infotainment systems. * **Battery Packs:** Protecting against external short circuits during discharge. * **Industrial Controls:** Low-voltage transformers and power supplies. ---