The **PRCP-R** series (specifically manufactured by Bourns) refers to a line of **Polymeric Positive Temperature Coefficient (PPTC)** resettable fuses in a radial-leaded package. These components are essential for overcurrent protection in electronic circuits. --- ## 1. Core Technical Specifications The PRCP-R series is designed to "trip" when a current threshold is exceeded, increasing its resistance to protect the load. | Feature | Description | | :--- | :--- | | **Component Type** | Resettable Fuse (PPTC) | | **Mounting Type** | Radial Leaded (Through-hole) | | **Operating Voltage** | Typically 60V (Standard for R series) | | **Hold Current ($I_{hold}$)** | Range from 0.05A to 11.0A | | **Trip Current ($I_{trip}$)** | Usually $2 \times I_{hold}$ | | **Operating Temp** | -40°C to +85°C | --- ## 2. How it Works (PPTC Physics) Unlike a standard one-time fuse that melts a wire, the PRCP-R uses a conductive polymer matrix. 1. **Normal State:** The carbon particles within the polymer form a low-resistance path, allowing current to flow to the device. 2. **Fault State (Overcurrent):** Excessive current causes $I^2R$ heating. The polymer expands, breaking the chains of carbon particles. 3. **Tripped State:** Resistance increases exponentially, reducing the current to a safe leakage level. 4. **Reset:** Once power is removed and the device cools, the polymer contracts, restoring the conductive paths. --- ## 3. Key Advantages * **Resettable:** Eliminates the need for user replacement after a fault. * **Safety Standards:** Most parts in the PRCP-R line are UL, CSA, and TÜV recognized. * **Durability:** Solid-state construction makes them resistant to shock and vibration compared to glass fuses. --- ## 4. Typical Applications * **Power Supplies:** Protecting against output short circuits. * **Industrial Controls:** Protecting sensors and PLC I/O ports. * **Computers & Peripherals:** USB port protection and motherboard power rails. * **General Electronics:** Any circuit where field service for fuse replacement is difficult or expensive. --- ### Part Numbering Example A typical part number like `PRCP-R050` breaks down as follows: * **PRCP:** Bourns Resettable Polyswitch series. * **R:** Radial Leaded form factor. * **050:** Hold Current (0.50 Amperes).