The **FRS-R-2/10** is a specific model of industrial power fuse from the Fusetron™ series, manufactured by Eaton (Bussmann Division). It is a **Class RK5** dual-element, time-delay fuse designed for motor protection and heavy-duty electrical circuits. --- ### 1. Key Technical Specifications The model number "2/10" indicates an amperage rating of **0.2 Amps**. | Feature | Specification | | :--- | :--- | | **Amperage Rating** | 0.2A (2/10 Amp) | | **Voltage Rating (AC)** | 600 Vac | | **Voltage Rating (DC)** | 300 Vdc | | **Interrupting Rating** | 200,000A (RMS Symmetrical) | | **Class** | RK5 | | **Type** | Dual-Element, Time-Delay | | **Dimensions** | 5.0" x 0.81" (Standard 600V RK5 Frame) | --- ### 2. Functional Components The "Electronic" or mechanical nature of this fuse is defined by its **Dual-Element** construction: 1. **Thermal Element:** * Designed to handle temporary "overloads." * It utilizes a spring-loaded mechanism held by a calibrated solder joint. If a sustained overload occurs, the solder melts, and the spring pulls the circuit open. * This allows the fuse to ignore temporary power surges (like a motor starting up). 2. **Magnetic/Instantaneous Element:** * Designed for "short circuits." * In the event of a high-energy fault, this part of the fuse clears the circuit almost instantly (typically within less than 0.01 seconds) to prevent equipment damage or fire. --- ### 3. Application Use Cases Because the FRS-R-2/10 is rated at a very low amperage (0.2A), it is typically used for protecting sensitive control components rather than large motors: * **Control Transformers:** Protecting the primary or secondary side of small industrial transformers. * **Solenoids:** Preventing burnout in electromagnetic coils. * **Small Motor Protection:** Used in specialized circuits where extremely low current draw is expected. * **Circuit Rejection:** The "R" in FRS-R indicates it has a **rejection feature**. This physical groove prevents someone from accidentally replacing it with a lower-rated, non-rejection fuse (like a Class K5), ensuring the safety integrity of the system. --- ### 4. Comparison with Similar Models | Model | Voltage | Delay Type | Class | | :--- | :--- | :--- | :--- | | **FRS-R** | 600V | Time-Delay | RK5 | | **FRN-R** | 250V | Time-Delay | RK5 | | **KTS-R** | 600V | Fast-Acting | RK1 |