The **LPS-RK-60SP** is a high-performance, current-limiting, dual-element time-delay fuse. It belongs to the **Low-Peak™** series manufactured by Bussmann (Eaton). This specific model is rated for **60 Amps** and is designed for power distribution and motor protection. --- ### Technical Specifications | Feature | Specification | | :--- | :--- | | **Part Number** | LPS-RK-60SP | | **Amperage Rating** | 60A | | **Voltage Rating (AC)** | 600 Vac | | **Voltage Rating (DC)** | 300 Vdc | | **Interrupting Rating (IR)** | 300kA RMS Sym. (AC) / 100kA (DC) | | **Fuse Class** | Class RK1 | | **Design Type** | Dual-Element, Time-Delay | | **Body Material** | Melamine glass tube with brass endcaps | --- ### Key Electronic & Functional Characteristics #### 1. Dual-Element Design The fuse contains two distinct components working in series: * **Thermal Element:** Handles low-level overloads. It provides a "time-delay" (typically 10 seconds at 500% of the rated current) to prevent nuisance tripping caused by motor startup currents. * **Magnetic/Short-Circuit Element:** A fast-acting component that triggers instantly if a high-magnitude short circuit occurs. #### 2. High Current Limitation As a **Class RK1** fuse, the LPS-RK-60SP is significantly more current-limiting than Class RK5 fuses. It limits the "peak let-through" current during a fault, which protects downstream components (like contactors and breakers) from thermal and magnetic stress. #### 3. High Interrupting Rating With a **300kA** interrupting rating, this fuse can safely extinguish very high-energy arcs, making it suitable for systems with high available fault currents. --- ### Applications * **Motor Branch Circuits:** Ideal for motors with high inrush currents. * **Inductive Loads:** Transformers and solenoids. * **Panelboards:** Used as a main or branch fuse in power distribution centers. * **General Purpose:** Protection of non-inductive loads where high-level short-circuit protection is required. --- ### Comparison: RK1 vs. RK5 | Feature | Class RK1 (LPS-RK) | Class RK5 (FRN-R / FRS-R) | | :--- | :--- | :--- | | **Protection Level** | Superior (Higher Limitation) | Standard | | **Let-through Energy** | Very Low | Moderate | | **Interchangeability** | Fits same holders as RK5 | Fits same holders as RK1 |