The **8345-B01B-R0** is a specific model within the E-T-A (Elektrotechnische Apparate GmbH) series of magnetic-hydraulic circuit breakers. These components are designed for precision protection in industrial and telecommunications equipment. --- ### 1. Component Specifications The part number "8345-B01B-R0" indicates a specific configuration. Below is the breakdown of its technical characteristics: | Feature | Specification | | :--- | :--- | | **Series** | 8345 (Magnetic-hydraulic) | | **Number of Poles** | 1-pole (Standard B-series) | | **Actuator Type** | Toggle Switch (typically R-style) | | **Mounting Style** | Rail mounting or Plug-in | | **Tripping Mechanism** | Magnetic-hydraulic (Delay/Instantaneous) | | **Auxiliary Contacts** | Depends on specific sub-ordering codes | --- ### 2. Key Electronic Principles The 8345 series operates on a **magnetic-hydraulic** principle, which differs from standard thermal breakers: 1. **Magnetic Trip:** A solenoid coil surrounds a tube containing a spring-loaded core and silicone fluid. In a short-circuit event, the high current creates a magnetic field strong enough to pull the core instantly, tripping the breaker. 2. **Hydraulic Delay:** In a moderate overload, the core moves slowly through the silicone fluid. This creates a "time-delay" characteristic, allowing for temporary inrush currents (like motor startups) without nuisance tripping. 3. **Temperature Stability:** Unlike thermal breakers, the trip point is not significantly affected by ambient temperature, making it ideal for cramped electronic enclosures. --- ### 3. Application Use Cases Due to its precision and reliability, this part is commonly used in: * **Telecommunications:** Protection for DC power distribution units (PDUs). * **Industrial Automation:** Protection for sensitive PLC outputs. * **Marine & Rail:** High-vibration environments where thermal breakers might fail or drift. --- ### 4. Technical Drawing Reference (General Layout) ```text [ Toggle Actuator ] | _________|_________ | | | (Line Terminal) | | | | | [Solenoid Coil] | | | | | (Load Terminal) | |___________________| ```