The **M3A22FBA-R** is a specific part number typically associated with the **M3A series of thermal-magnetic circuit breakers** or specialized magnetic switches, often produced by manufacturers like **Mitsubishi Electric** (specifically in their industrial automation and power distribution lines). Below is a breakdown of the electronic and mechanical characteristics of this component series. --- ### 1. Technical Specifications Table | Feature | Description | | :--- | :--- | | **Type** | Molded Case Circuit Breaker (MCCB) / Magnetic Switch | | **Series** | M3A Series | | **Poles** | Typically 3-Pole configuration | | **Current Rating** | Varies by sub-model (refer to frame size) | | **Voltage Rating** | AC 200V - 440V (Standard Industrial) | | **Breaking Capacity** | High-interrupting capacity for industrial faults | | **Mounting** | DIN Rail or Bolt-on options | --- ### 2. Core Electronic & Internal Components The "Electronic parts" of an MCCB like the M3A22FBA-R are primarily focused on **sensing, conduction, and protection**. #### A. Trip Unit (The "Brain") * **Thermal Element:** Uses a bimetallic strip that bends when heated by overcurrent. This provides a "time-delay" trip for minor overloads. * **Magnetic Element:** An electromagnetic coil that reacts instantaneously to short-circuit currents. If the current spikes, the magnetic field pulls a trip bar to open the contacts immediately. #### B. Contact System * **Moving and Fixed Contacts:** Made of silver-alloy compositions to resist welding and minimize electrical resistance. * **Arc Extinguisher (Arc Chute):** A series of metal plates that break the electrical arc into smaller segments when the breaker opens under load, cooling the ionized gas. #### C. Terminals and Housing * **Molded Case:** Made of high-strength, flame-retardant glass-polyester or phenolic resin to provide insulation between phases. * **Terminal Screws:** High-torque lugs designed to ensure a low-resistance connection to the power cables. --- ### 3. Part Number Suffix Breakdown While nomenclature can vary by region, the suffix **"R"** usually denotes specific physical or electrical attributes: * **FBA:** Often refers to the Frame size or the specific "Base" mounting style. * **-R:** Generally indicates **Reverse Connection** capability or a specific **RoHS compliance** (Environmental regulation) marker depending on the manufacturing date. --- ### 4. Typical Applications * **Motor Protection:** Safeguarding industrial motors from burnout due to phase loss or overload. * **Panel Boards:** Serving as the main or branch disconnect in electrical distribution boards. * **HVAC Systems:** Used in heavy-duty cooling units for surge and fault protection.