The **W2SP-113-R2/UL** is a specific model of a **Miniature Circuit Breaker (MCB)** or a supplementary protector, typically manufactured by **Waco** (or similar industrial component brands). These devices are designed to protect electrical circuits from overcurrent and short circuits in industrial control panels. --- ### 1. Technical Specifications The following table outlines the primary electrical and mechanical characteristics of the W2SP-113-R2/UL: | Characteristic | Specification | Description | | :--- | :--- | :--- | | **Series** | W2SP | Miniature Supplementary Protector | | **Poles** | 1-Pole | Single-phase protection | | **Rated Current (In)** | 13 Amperes | Maximum continuous current capacity | | **Voltage Rating** | 277V AC / 480V AC | Suitable for industrial line voltages | | **Trip Curve** | Type C (Typical) | Magnetic trip at 5–10 times rated current | | **Certification** | UL 1077 | Recognized for supplementary protection | | **Mounting** | DIN Rail | Standard 35mm industrial mounting | --- ### 2. Key Component Features #### A. Internal Mechanisms * **Thermal Element (Bimetallic Strip):** Provides "delayed" tripping for overloaded circuits. When current exceeds 13A for a prolonged period, the strip heats up and bends, triggering the mechanical latch. * **Magnetic Coil (Solenoid):** Provides "instantaneous" tripping during a short circuit. High-fault currents create a magnetic field that moves a plunger to open the contacts immediately. * **Arc Chute:** A series of metal plates that extinguish the electrical arc generated when the contacts open under load, preventing damage to the device. #### B. Safety and Compliance * **UL 1077 Standard:** Unlike UL 489 (Branch Circuit Breakers), UL 1077 devices are used as "supplementary protectors." This means they are intended for use *inside* equipment where branch circuit protection is already provided. * **Visual Status Indicator:** Most R2 series models feature a window showing Red (Tripped/Off) or Green (Normal/On) status. --- ### 3. Application Use Cases This specific part is commonly found in the following environments: 1. **Industrial Control Panels:** Protecting PLC (Programmable Logic Controller) inputs/outputs. 2. **Power Supplies:** Serving as a secondary fuse for AC/DC converters. 3. **Solenoid Valves:** Protecting individual valve circuits from burning out. 4. **Laboratory Equipment:** Providing localized overcurrent protection for sensitive instruments. ---