The **8345-C04B-R0** is a specific part number belonging to the **8345 series** of hydraulic-magnetic circuit breakers manufactured by **E-T-A**. This series is designed for high-performance applications, offering precision tripping and robust protection. --- ### ## Technical Specifications Overview The 8345-C04B-R0 is a configurable magnetic circuit breaker. Below is a breakdown of its primary electronic and physical characteristics: | Feature | Specification Details | | :--- | :--- | | **Series** | 8345 (Hydraulic-Magnetic) | | **Number of Poles** | Multipolar (Variable based on configuration, typically 2 or 3) | | **Mounting Style** | Rail mounting or Flange mounting | | **Actuator Style** | Rocker switch / Toggle | | **Voltage Rating** | Up to 80V DC or 240/415V AC (depends on sub-code) | | **Current Rating** | Typically ranges from 0.05A to 125A | | **Trip Mechanism** | Hydraulic-Magnetic (Temp independent) | --- ### ## Key Electronic Components & Operation #### 1. Hydraulic-Magnetic Trip Mechanism Unlike thermal breakers that rely on a bimetallic strip (which is sensitive to ambient temperature), the 8345-C04B-R0 uses a solenoid coil with a spring-loaded core submerged in silicone oil. * **Precision:** It trips based on the actual current flow, not heat. * **Consistency:** The trip point remains stable regardless of whether the equipment is in a cold server room or a hot industrial floor. #### 2. The "C04B" Configuration Segment In E-T-A nomenclature, these codes define the specific internal behaviors: * **Characteristic (C):** Defines the delay curve (e.g., Short Delay, Medium Delay, or Long Delay). This allows for high inrush currents (like starting a motor) without nuisance tripping. * **Terminal Design (04):** Refers to the physical connection points, often blade terminals or screw terminals. * **Mounting/Actuator (B):** Denotes the rocker style or handle color/marking. #### 3. Protection Features * **Auxiliary Contacts:** These units often include a signal contact to notify a PLC or control system if the breaker has tripped. * **Galvanic Isolation:** Provides physical separation of the circuit when in the "OFF" position for safety. --- ### ## Common Applications The 8345 series is widely used in environments where reliability is critical: 1. **Telecommunications:** Protection of DC power distribution units (PDUs). 2. **Industrial Automation:** Safeguarding PLCs and sensitive control circuits. 3. **Marine/Transportation:** Due to its resistance to vibration and temperature fluctuations. 4. **Medical Equipment:** High precision current monitoring. ---