The **8340-G210-R1H2** is a specific part number within the E-T-A (Elektrotechnische Apparate GmbH) series of **Magnetic-Hydraulic Circuit Breakers**. These devices are designed for precision protection in telecommunications, industrial controls, and rail applications. Below is a detailed breakdown of the electronic and mechanical specifications for this component. --- ### 1. Part Number Deciphering The alphanumeric string defines the physical and electrical characteristics of the unit: | Code Segment | Meaning | Description | | :--- | :--- | :--- | | **8340** | Series | Magnetic-Hydraulic Circuit Breaker | | **G2** | Mounting/Actuation | Toggle actuator, threadneck panel mounting | | **1** | Number of Poles | 1-pole configuration | | **0** | Mounting Hardware | Without hex nut/lock washer (standard) | | **R1** | Characteristic | Medium delay curve (standard magnetic-hydraulic) | | **H2** | Terminal Type | Round connectors / Solder terminals | --- ### 2. Core Technical Specifications This device combines electromagnetic tripping with a hydraulic delay mechanism, allowing it to ignore brief current surges (like motor startups) while tripping instantly on short circuits. * **Voltage Rating:** Typically up to 240V AC (50/60Hz) or 80V DC. * **Current Rating:** Specified at the time of order (ranges from 0.02A to 50A). * **Interrupting Capacity:** 2,000A (AC) / 5,000A (DC). * **Insulation Resistance:** > 100 MΩ at 500V DC. * **Operating Temperature:** -40°C to +85°C. --- ### 3. Key Electronic Features #### A. Magnetic-Hydraulic Operation Unlike thermal breakers (which rely on a bimetal strip and are sensitive to ambient heat), the 8340 series uses a solenoid coil. 1. **Hydraulic Core:** A core moves through a silicone fluid. 2. **Temperature Stability:** The trip point remains constant regardless of the surrounding temperature, making it ideal for cramped electronic enclosures. #### B. The "R1" Trip Curve The **R1 characteristic** provides a medium-time delay. This is designed for general-purpose electronic loads where a small amount of inrush current is expected, but sustained overloads must be cut off to protect sensitive PCB components. #### C. Typical Applications * **Telecommunications:** Protection of power distribution units (PDUs). * **Process Control:** PLC protection and automation systems. * **Marine/Rail:** Robustness against vibration and shock. --- ### 4. Comparison: Magnetic vs. Thermal Breakers | Feature | Magnetic-Hydraulic (8340) | Thermal Breaker | | :--- | :--- | :--- | | **Ambient Temp Effect** | Minimal (Stable) | High (Trips early if hot) | | **Reset Time** | Immediate | Requires cooling period | | **Trip Mechanism** | Magnetic Flux | Bimetal Expansion | | **Precision** | High | Moderate | ---