### KTK-R-30 Electronic Component Overview The **KTK-R-30** is a high-performance industrial fuse belonging to the **Limitron™** series, manufactured primarily by Bussmann (Eaton). It is specifically designed as a "rejection-type" fuse to provide high-speed protection for sensitive electrical circuits. --- ### Technical Specifications | Feature | Specification | | :--- | :--- | | **Fuse Type** | Fast-Acting / Class CC | | **Current Rating** | 30 Amperes | | **Voltage Rating (AC)** | 600 Vac | | **Interrupting Rating** | 200,000 Amps (RMS Symmetrical) | | **Physical Size** | 13/32" x 1-1/2" (10.3 x 38.1 mm) | | **Material** | Melamine tube with Nickel-plated brass endcaps | | **Termination Style** | Cartridge (Ferrule) | --- ### Key Electronic Characteristics #### 1. Class CC Rejection Feature The "R" in the part number signifies its **rejection capability**. These fuses have a physical groove in the end cap that prevents them from being replaced by fuses with lower voltage or interrupting ratings in a Class CC fuse holder. This is a critical safety feature in industrial panels. #### 2. Fast-Acting Response Unlike "Time-Delay" fuses, the KTK-R-30 is **Fast-Acting**. It is designed to open very quickly when it detects an overcurrent or short-circuit condition. This makes it ideal for protecting components that cannot withstand prolonged surges. #### 3. High Interrupting Capacity With a rating of **200kA**, this fuse can safely clear very high-magnitude fault currents without exploding or rupturing, which protects the surrounding switchgear and personnel. --- ### Common Applications * **Control Transformer Protection:** Often used on the primary side of transformers. * **Lighting Circuit Protection:** Specifically for ballast protection. * **General Purpose Circuits:** Where high-fault current limitations are required. * **Motor Control Circuits:** Used for branch circuit protection (though motor-start loads often prefer time-delay fuses like the LP-CC series). --- ### Comparison: KTK-R vs. KTK | Feature | KTK (Standard) | KTK-R (Rejection) | | :--- | :--- | :--- | | **Class** | Supplemental | Class CC | | **Branch Circuit Rated** | No | Yes (UL Listed) | | **Rejection Tip** | No | Yes | | **Primary Use** | General/Meters | Safety-Critical Branch Circuits |