- Core Parameters and Application Scenarios
- Specification Parameterspole 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.
- 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.
- Supporting Equipment and Installation Points
- 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.
- 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
- 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.
- 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.
- Troubleshooting and Maintenance
- 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.
- 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.
- Upgrade Schemes and Alternative Products
- 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.
- 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.
- Safety and Compliance Tips
- 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).
- 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.
