The **ATDR10** is a specific model of a **Time-Delay Class CC fuse** manufactured by Mersen (formerly Ferraz Shawmut). It is designed to provide overcurrent protection for components with high inrush currents. --- ### 1. Technical Specifications The table below summarizes the core electrical characteristics of the ATDR10: | Parameter | Specification | | :--- | :--- | | **Current Rating** | 10 Amperes | | **Voltage Rating (AC)** | 600 VAC | | **Voltage Rating (DC)** | 300 VDC | | **Interrupting Rating** | 200,000 Amps at 600VAC | | **Fuse Class** | Class CC | | **Characteristic** | Time-Delay (Slow-Blow) | | **Body Material** | Melamine | --- ### 2. Key Features and Design * **Time-Delay Functionality:** Unlike "fast-acting" fuses, the ATDR10 can withstand temporary surges (inrush current) without blowing. This is essential for protecting motors and transformers that pull high current for a split second upon startup. * **Rejection Feature:** As a Class CC fuse, it features a physical "rejection tip." This prevents the installation of lower-rated fuses (like Midget fuses) into a Class CC fuse holder, ensuring the safety of the circuit is maintained. * **High Current Limitation:** It is highly effective at limiting the "Peak Let-Thru" current, which prevents electromagnetic stress and thermal damage to downstream components during a short circuit. --- ### 3. Applications The ATDR10 is commonly used in industrial and commercial control panels for: 1. **Small Motors:** Providing branch circuit protection. 2. **Control Transformers:** Handling the high magnetizing inrush current. 3. **Contactors and Relays:** Protecting sensitive switching components. 4. **Heating Elements:** Where stable, high-voltage protection is required. --- ### 4. Comparison: Time-Delay vs. Fast-Acting If you are substituting or designing a circuit, it is important to understand the difference: | Feature | ATDR (Time-Delay) | ATMR (Fast-Acting) | | :--- | :--- | :--- | | **Internal Reaction** | Slow to react to small overloads | Reacts almost instantly | | **Best Used For** | Inductive loads (Motors/Transformers) | Resistive loads (Lighting/Heating) | | **Inrush Handling** | High tolerance | Low tolerance |