### Technical Overview of FRS-R-6 The **FRS-R-6** is a high-performance industrial fuse manufactured by **Eaton (Bussmann Series)**. It belongs to the **Fusetron™** family and is a **Class RK5** dual-element, time-delay fuse. --- ### 1. Key Technical Specifications | Feature | Specification | | :--- | :--- | | **Current Rating** | 6 Amps | | **Voltage Rating (AC)** | 600 Vac | | **Voltage Rating (DC)** | 300 Vdc | | **Interrupting Rating (AC)** | 200,000 Amps (RMS Symmetrical) | | **Interrupting Rating (DC)** | 20,000 Amps | | **Fuse Class** | Class RK5 | | **Type** | Dual-Element, Time-Delay | | **Physical Size** | 5.0" x 0.81" (Standard Ferrule) | --- ### 2. Core Functional Features * **Dual-Element Design:** Unlike standard fast-acting fuses, the FRS-R-6 contains two distinct components. One handles short-circuit protection (instantaneous blow), while the other handles temporary overloads. * **Time-Delay (Slow Blow):** It can withstand temporary surges, such as motor startup currents, for at least **10 seconds at 500%** of its rated current. This prevents "nuisance blowing." * **Current Limiting:** In the event of a high-magnitude short circuit, the fuse reacts extremely quickly to restrict the total energy flow, protecting downstream sensitive electronics. * **Rejection Feature:** The "R" in FRS-R indicates it is a rejection-style fuse. It has a specific physical notch that allows it to fit into RK5 fuse holders but prevents the installation of lower-rated fuses (like Class H) into the same circuit. --- ### 3. Common Applications The FRS-R-6 is primarily used in industrial and commercial electrical systems where motor loads or inductive components are present: 1. **Motor Control Centers:** Providing branch circuit protection for small motors. 2. **Transformers:** Protecting against primary and secondary overcurrent. 3. **Solenoids and Relays:** Handling the high inrush current required to energize coils. 4. **General Feeders:** Used in mains and branch circuits where high voltage (up to 600V) is present. --- ### 4. Visual/Mechanical Diagram ` ` `text Standard RK5 Ferrule Cartridge ___________________________________ | | | | | CAP | BODY | CAP | | (End) | (Insulation) | (End) | |________|_________________|________| | | |--- Diameter: 0.81 in ----| |------- Length: 5.0 in -----------| ` ` ` ---