The **PRCP-R135** is a Resettable Fuse, specifically a **Polymeric Positive Temperature Coefficient (PPTC)** device. It is commonly used in electronic circuits to protect against overcurrent conditions without requiring manual replacement after a fault. --- ### 1. Key Technical Specifications The following table summarizes the primary electrical characteristics of the PRCP-R135: | Parameter | Value | Description | | :--- | :--- | :--- | | **$I_{hold}$** | 1.35 A | The maximum current the device can carry without tripping. | | **$I_{trip}$** | 2.70 A | The minimum current at which the device will switch to high resistance. | | **$V_{max}$** | 30 V | The maximum voltage the device can withstand. | | **$I_{max}$** | 40 A | The maximum fault current the device can safely interrupt. | | **$P_d$ (Typ.)** | 0.8 W | Power dissipated when the device is in the tripped state. | | **Mounting Type** | Radial Leaded | Through-hole mounting for PCBs. | --- ### 2. How it Works (PPTC Principle) The PRCP-R135 operates based on the thermal properties of its conductive polymer composite: 1. **Normal Operation:** Under normal current ($I_{hold}$), the conductive particles inside the polymer form a low-resistance path, allowing current to flow freely. 2. **Fault Condition:** If a short circuit or overcurrent occurs ($I_{trip}$), the excessive current generates heat ($I^2R$). 3. **Tripping:** The heat causes the polymer to expand, breaking the chains of conductive particles. The resistance increases dramatically, reducing the current to a safe leakage level. 4. **Resetting:** Once the fault is removed and the power is cycled or the device cools down, the polymer contracts, reconnecting the conductive paths and returning to low resistance. --- ### 3. Physical Dimensions & Material The "R" in the series usually denotes a radial-leaded package, often coated with flame-retardant epoxy. * **Lead Material:** Tin-plated copper. * **Encapsulation:** Cured, flame-retardant epoxy polymer meeting UL 94V-0 requirements. * **Typical Size:** Small disc-like shape suitable for dense PCB layouts. --- ### 4. Common Applications Due to its 1.35A holding current and 30V rating, the PRCP-R135 is frequently found in: * **Computer Peripherals:** USB ports and plug-and-play interfaces. * **Battery Packs:** Protection against external short circuits. * **General Electronics:** Power supplies, industrial controls, and automotive sensors.