The **MF-R600** is a specific model of **Resettable PTC (Positive Temperature Coefficient) Fuse**, manufactured primarily by **Bourns**. It belongs to the Multifuse® polymer-based product line. --- ## 1. Core Specifications The MF-R600 is designed to protect electrical circuits from overcurrent conditions. Below are the primary technical parameters: | Parameter | Specification | Description | | :--- | :--- | :--- | | **I-hold (Hold Current)** | 6.0 Amps | The maximum current the device will pass without tripping. | | **I-trip (Trip Current)** | 12.0 Amps | The minimum current at which the device will switch to high resistance. | | **V-max (Voltage Max)** | 30 Volts | The maximum voltage the device can withstand without damage. | | **I-max (Current Max)** | 40 Amps | The maximum fault current the device can safely handle. | | **R-min / R1-max** | 0.01 / 0.04 $\Omega$ | The resistance range of the device in its initial state. | | **Package Type** | Radial Leaded | Through-hole mounting style. | --- ## 2. How It Works Unlike a traditional fuse that "blows" and must be replaced, the MF-R600 is **resettable**: 1. **Normal State:** The conductive polymer allows current to flow with very low resistance. 2. **Fault State:** If an overcurrent occurs, the internal temperature of the device rises. The polymer expands, breaking the conductive paths and increasing resistance drastically (tripping). 3. **Reset State:** Once the power is disconnected and the fault is removed, the device cools down, the polymer contracts, and the conductive paths are restored. --- ## 3. Physical Characteristics The MF-R600 is easily identifiable by its physical appearance: * **Form Factor:** Circular or rectangular "disc" shape. * **Coating:** Yellow or tan flame-retardant epoxy polymer. * **Leads:** Two tin-plated copper wires for through-hole PCB mounting. * **Marking:** Usually marked with "MF-R600" and a date code. --- ## 4. Typical Applications Because of its high hold current (6A), the MF-R600 is commonly used in: * **Power Supplies:** Protecting against output short-circuits. * **Industrial Controls:** Protecting motors or solenoid valves. * **Battery Packs:** Safeguarding against accidental discharge shorts. * **Computing:** High-draw peripheral ports and motherboards. ---