The **8340-G210-R1R2** is a specific model within the **8340 series** of magnetic-hydraulic circuit breakers manufactured by **E-T-A**. This component is designed for precise overcurrent protection in telecommunications, control systems, and industrial automation. --- ### 1. Technical Specifications The part number defines the physical and electrical characteristics of the device. | Feature | Specification | Description | | :--- | :--- | :--- | | **Series** | 8340 | Magnetic-hydraulic circuit breaker | | **Mounting** | G2 | Rail mounting (DIN rail) | | **Actuator** | 1 | Toggle switch (Single pole) | | **Terminal** | 0 | Screw terminals | | **Characteristic** | R1 | Medium delay (standard curve) | | **Auxiliary Contact** | R2 | Auxiliary contact (NO/NC configuration) | --- ### 2. Core Electronic Principles Unlike standard thermal breakers that rely on heat to bend a bimetallic strip, the 8340-G210-R1R2 uses a **magnetic-hydraulic mechanism**: * **Magnetic Solenoid:** A coil senses the current flow. When a short circuit occurs, the massive magnetic field instantly pulls the armature to trip the breaker. * **Hydraulic Delay:** For moderate overloads, a plunger moves through a silicone fluid. The viscosity of the fluid provides the "R1" time delay, preventing nuisance trips caused by temporary power surges. * **Temperature Independence:** Because it is magnetic rather than thermal, its trip point remains stable regardless of the ambient temperature (unlike standard fuses or thermal breakers). --- ### 3. Wiring and Auxiliary Functions The **R2** suffix indicates the inclusion of an integrated auxiliary contact circuit. #### Auxiliary Contact Logic This is used for remote signaling (e.g., sending a signal to a PLC or turning on a warning LED). | Breaker State | Main Contacts | Auxiliary Contact (R2) | | :--- | :--- | :--- | | **ON** | Closed | Standard Operating State | | **OFF (Manual)** | Open | Signal Changes | | **TRIPPED (Fault)** | Open | Signal Changes (Alerts System) | --- ### 4. Typical Applications * **Telecommunications:** Protecting DC power distribution units. * **Process Control:** Ensuring sensitive PLCs are not damaged by overcurrent. * **Medical Equipment:** Precise protection where heat sensitivity is an issue.