Chint 6L2-A 100/5A Pointer-type AC Ammeter

 I. Core Parameters and Application Scenarios

1. **Specification Parameters*pole box electrical*  

   - **Measuring Range**: Connected via a current transformer, the nominal range is 100A (the actual input signal is the 5A secondary current of the transformer).  

   - **Accuracy**: Class 1.5, meeting the requirements of conventional industrial measurement.  

   - **Overall Dimensions**: The mounting hole size is approximately 76mm × 76mm, suitable for installation in standard distribution cabinets.  

   - **Working Environment**: Temperature -5℃ ~ 40℃, humidity ≤ 90%, altitude ≤ 1000 meters, applicable to indoor environments without strong corrosion.  

2. **Typical Applications**  

   - **Industrial Power Distribution**: Monitoring three-phase or single-phase currents of equipment such as motors and transformers, e.g., factory distribution cabinets and building distribution boxes.  

   - **Energy Management**: Cooperating with current transformers (such as Chint RCT series) to realize real-time current monitoring of power systems, supporting lines below 0.66kV.  

   - **Temporary Power Supply**: Used as a basic current indicating tool in mobile distribution boxes at construction sites and temporary facilities.  

 II. Supporting Equipment and Installation Points

1. **Selection of Current Transformer**  

   - **Recommended Model**: Chint RCT series annular transformers. The through-hole diameter should match the cable specifications (e.g., RCT-60 is suitable for 60mm wire diameter), with a current ratio of 100/5A and accuracy of Class 0.5.  

   - **Wiring Requirements**: The secondary side (S1, S2) of the transformer must be connected in series with the ammeter, and the S2 terminal must be reliably grounded to avoid high-voltage hazards caused by open circuits.  

2. **Installation Steps**  

   - **Mechanical Fixing**: Embed the ammeter into the panel of the distribution cabinet, tighten the fixing nuts on the back, and ensure the dial is vertical and flat.  

   - **Electrical Connection**:  

     - Connect transformer S1 to the "+" terminal of the ammeter, S2 to the "-" terminal, and ground it.  

     - For a three-phase system, three transformers and three ammeters need to be connected separately, paying attention to phase consistency.  

   - **Polarity Verification**: Before powering on, use a multimeter to check the on-off status of the transformer secondary circuit to ensure there is no short circuit or open circuit.  

 III. Price and Purchase Channels

1. **Market Quotation**  

   - **Price per Unit**: 19.75 yuan to 39.33 yuan. Bulk purchases can be negotiated.  

   - **Supporting Cost**: The RCT-60 transformer is approximately 50 yuan each, and the configuration depends on the number of cables.  

2. *Purchase Suggestions**  

   - **Platform Selection**: Industrial product platforms (such as Lichuang Mall) have transparent prices and sufficient spot goods. E-commerce platforms (Suning, Taobao) are suitable for small-batch purchases.  

 IV. Troubleshooting and Maintenance

1. **Handling of Common Problems**  

   - **Pointer Not Moving**:  

     - Check if the transformer secondary circuit is open and if the fuse is blown.  

     - Test whether there is current on the primary side of the transformer (e.g., using a clamp meter) to rule out faults on the load side.  

   - **Abnormal Reading**:  

     - Confirm that the transformer turns ratio matches the ammeter range (e.g., a 100/5A transformer corresponds to the 100A scale).  

     - Clean the dial glass and pointer to avoid dust affecting observation.  

2. **Regular Maintenance**  

   - **Periodic Inspection**: Clean the housing and terminals every quarter, and calibrate the accuracy every year (entrust a third-party institution if necessary).  

   - **Environmental Protection**: Avoid use in high-temperature, humid, or strong electromagnetic interference environments. Install a protective cover if necessary.  

 V. Upgrade Schemes and Alternative Products

1. **Recommended Intelligent Digital Meters**  

   - **PA/PZ666 Series**: Supports RS485 communication, over-limit alarm, and data transmission, with an accuracy of Class 0.5. Suitable for scenarios requiring remote monitoring, priced at approximately 60 ~ 120 yuan.  

   - **NXBLE Series Circuit Breaker Integration Scheme**: Some residual current circuit breakers (such as NXBLE-63) have a built-in current display function, which can replace traditional pointer meters to realize integrated protection and monitoring.  

2. **Model Replacement Instructions**  

   - If the "6L2A" mentioned by the user is an old model, it may correspond to the **6L2-A** series. The parameters of the two are compatible and can be directly replaced.  

   - For high-precision requirements (such as laboratories), it is recommended to choose the 42L6-A series (accuracy Class 1.0), priced at approximately 22 yuan per unit.  

 VI. Safety and Compliance Tips

1. **Certifications and Standards**  

   - The ammeter complies with the GB/T 13978-2008 standard, and the transformer complies with GB/T 20840.2. Some models have passed the CCC certification.  

   - For export scenarios, models with CE and UL certifications should be selected (such as the international version of Chint RCT series).  

2. **Operation Specifications**  

   - It is strictly forbidden to disassemble the ammeter when the primary side of the transformer is live; the upper-level power supply must be disconnected first.  

   - Disconnect the transformer secondary circuit before long-term shutdown to prevent residual magnetism from affecting accuracy.