The **8345-C01B-R0** is a specialized electronic component, specifically a **Hydraulic-Magnetic Circuit Breaker** manufactured by **E-T-A**. This series is designed for precision protection in telecommunications, industrial equipment, and power distribution units. --- ### 1. Key Technical Specifications The model number represents a configuration within the 8345 series. Below are the typical electronic characteristics: | Parameter | Specification | | :--- | :--- | | **Series** | 8345 (Magnetic-Hydraulic) | | **Mounting Type** | Rail mount or plug-in (depending on base) | | **Number of Poles** | 1 (Single Pole) | | **Voltage Rating** | Up to 80V DC or 240V AC (Standard range) | | **Current Rating** | Configurable (Commonly 0.05A to 125A) | | **Mechanism** | Toggle-style actuator | | **Terminal Type** | Round connectors / Busbar compatible | --- ### 2. Functional Components The 8345-C01B-R0 operates using three primary internal mechanisms: 1. **Hydraulic-Magnetic Sensing:** * Unlike thermal breakers, this uses a solenoid coil and a fluid-filled cylinder. * It is **temperature independent**, meaning it will trip at the exact rated current regardless of ambient heat in the server rack or cabinet. 2. **Delay Tube:** * The "Hydraulic" part provides a time-delay. Under moderate overcurrent, the core moves slowly through the fluid. Under short-circuit conditions, the magnetic force instantly overcomes the fluid resistance to trip. 3. **Toggle Switch:** * Provides manual ON/OFF control and a clear visual indication of whether the circuit has tripped. --- ### 3. Part Number Breakdown (Typical for E-T-A 8345) * **8345**: The series designation (Hydraulic-Magnetic). * **C**: Mounting/Terminal style (often refers to specific blade or screw terminals). * **01**: Number of poles (1-pole protected). * **B**: Characteristic curve (Typically a medium delay for inductive loads). * **R0**: Special feature or revision code (Standard hardware/packaging). --- ### 4. Common Applications * **Telecommunications:** Protection of DC power plants and battery systems. * **Automation:** Control cabinets where precision tripping is required. * **Data Centers:** Power Distribution Units (PDUs) for servers. ---