The **MF-RHT1300-AP** is a high-temperature, radial-leaded **Polymeric Positive Temperature Coefficient (PPTC)** resettable fuse, manufactured by Bourns. It is part of the MF-RHT series, specifically designed for automotive and high-operating temperature environments. --- ### 1. Key Technical Specifications | Parameter | Specification | | :--- | :--- | | **Hold Current ($I_{hold}$)** | 13.0 Amperes | | **Trip Current ($I_{trip}$)** | 24.0 Amperes | | **Max Voltage ($V_{max}$)** | 16 Volts (DC) | | **Max Current ($I_{max}$)** | 100 Amperes | | **Operating Temp Range** | -40 °C to +125 °C | | **Packaging** | Ammo Pack (indicated by "-AP") | | **Mounting Type** | Through-Hole (Radial Leaded) | --- ### 2. Functional Characteristics #### How it Works The device is made of a conductive plastic (polymer) matrix mixed with carbon black particles. * **Normal State:** The particles form chains, allowing current to flow with low resistance. * **Tripped State:** When an overcurrent or overtemperature event occurs, the polymer expands, breaking the conductive chains. The resistance increases exponentially, limiting the current to a safe leakage level. * **Resetting:** Once the fault is removed and the device cools down, the polymer contracts, and the device returns to a low-resistance state. #### The "RHT" Distinction The "RHT" prefix signifies **High Temperature** resistance. While standard PPTCs are rated up to 85°C, this series is AEC-Q200 compliant and rated up to **125°C**, making it suitable for under-the-hood automotive applications where ambient heat is significant. --- ### 3. Comparison with Traditional Fuses | Feature | MF-RHT1300-AP (PPTC) | Standard Wire Fuse | | :--- | :--- | :--- | | **Reusability** | Resettable (Multiple uses) | One-time use (Must be replaced) | | **Resistance** | Slightly higher | Very low | | **Response Time** | Slower (Thermal-based) | Faster (Melting-based) | | **Maintenance** | Low (Self-healing) | High (Requires physical access) | --- ### 4. Typical Applications * **Automotive Electronics:** Engine control modules, cooling fan motors, and lighting circuits. * **Industrial Controls:** Protection for motors and actuators in hot environments. * **Battery Packs:** Overcurrent protection during charging/discharging in high-capacity packs.