The **METSECT5MB030** is a specific model within the Schneider Electric **PowerLogic** range. It is a low-voltage **Current Transformer (CT)** designed for use with metering and monitoring equipment. --- ### 1. Key Technical Specifications Below are the primary electrical and physical characteristics of the METSECT5MB030: | Feature | Specification | | :--- | :--- | | **Product Type** | Current Transformer (Tropicalized) | | **Current Ratio** | 300 / 5 A | | **Accuracy Class** | Class 0.5 at 6 VA / Class 1 at 8 VA | | **Mounting Mode** | By screws, clips, or DIN rail | | **Primary Current** | 300 A | | **Secondary Current** | 5 A | | **Safety Factor** | < 5 | | **Insulation Voltage** | 3 kV | --- ### 2. Electronic Components and Construction While a current transformer does not contain complex microchips, its "electronic" operation relies on precise electromagnetic induction components: * **Secondary Terminals:** These are the output points (S1 and S2) where the 5A signal is sent to the meter. They usually feature screw-clamp terminals for secure connection. * **Toroidal Core:** A high-permeability magnetic core that ensures linear transformation of the current and minimizes energy loss (hysteresis). * **Encapsulation:** The internal windings are protected by a flame-retardant (UL94V-0) plastic housing, ensuring the device can withstand industrial environments. * **Sealable Covers:** The METSECT5MB030 includes integrated covers for the secondary terminals to prevent unauthorized tampering, which is critical for billing/revenue applications. --- ### 3. Application and Usage The METSECT5MB030 is used to "step down" a high current (up to 300A) to a lower, manageable current (5A) that electronic power meters can safely process. 1. **Measurement:** Used with PowerLogic power meters to monitor energy consumption. 2. **Protection:** Provides input for relays to detect overcurrent conditions. 3. **Integration:** Common in Low Voltage (LV) switchboards and motor control centers. --- ### 4. Safety Warning > **CRITICAL:** Never leave the secondary terminals (S1, S2) of a current transformer open-circuited while the primary current is flowing. This can lead to extremely high voltage buildup, causing insulation failure, equipment damage, or fatal electric shock.