Intelligent Circuit Breaker Product Manual

1. Product Overview

A smart circuit breaker integrated with Modbus communication protocol, suitable for distribution systems with AC 50/60Hz, rated voltage 230/400V, current 63A and below. Supporting remote control, overvoltage and undervoltage protection, automatic reclosing, and other functions, it can be widely used in smart grids, industrial automation, and building power distribution scenarios.

Product purchase:https://www.modbus.cn/product/30887.html

2. Functional Features

• Core Functions
  • Over and Under Voltage Protection: The threshold can be configured, supporting automatic opening and closing and recovery mechanisms.
  • Leakage protection (optional): 30mA/100mA/300mA graded tripping, response time<100ms.
  • Multi mode control: local manual, remote command, dry wet contact (optional), timed operation (optional).
  • Automatic Recloser: 5-level cycle interval (adjustable from 60s to 3600s), stable time configuration.
• Communication Capability
  • Modbus RTU Protocol: Supports read/write operations, address range 1-247, broadcast address 0 (read only).
  • Multi protocol compatibility: RS485 (default), WiFi (graffiti platform) ZigBee.
• Status indicator
  • indicator light:
    • Green light (closed), red light (open/faulty), orange light (manual mode).
    • The flashing frequency distinguishes the type of fault (such as 100ms flash for mechanism fault, 500ms for overvoltage disconnection).
  • Fault TypeOvervoltage, undervoltage, overcurrent, leakage, hardware failure (EEPROM/clock chip, etc.).

3. Technical Parameters

4. Installation and wiring

• Installation requirements
  • Vertically installed in a dry and ventilated environment, avoiding high temperatures (>40 ℃) and condensation.
  • Use M5 screws to fix the guide rail and ensure that the mechanical lock is secure.
• Wiring Specification
  • Power Line: Neutral and live wires must not be reversed, and the cable cross-sectional area should be ≤ 25mm ².
  • Communication line: Twisted shielded wire (2 × 0.5mm ²), single ended grounding of shielding layer, bus length ≤ 1200m.

5. Full Analysis of Modbus Communication Protocol

5.3 Register Definition (Complete Classification)

5.3.2 Status Monitoring Register

1. Opening and Closing Status Encoding Table (Address 0x5000)

2. Fault status bit mapping table (address 0x5003)

5.3.3 Other key register supplements

1. Recloser event record (address 0x5300~0x5303)

2. Timing control configuration (addresses 0x6D00~0x6D0E)

3. Special Function Register (Address 0xF205~0xF380)

6. Operation example and data parsing (including complete CRC)

Example 1: Read on/off status (address 0x5000)

• Request frame(device address 1):

  01 03 50 00 00 01 85 C8  

• CRC calculation: 0x85C8(calculated through CRC-16/A001).
• Response frame(status code=3, fault disconnection):

  01 03 02 00 03 35 29  

• Data parsing: 00 03→ Status code 3 (fault disconnection).

Example 2: Set overvoltage threshold to 300.0V (address 0x6601)

• Request frame(Device Address 1):

  01 06 66 01 0B B8 1A 7F  

• Data Analysis: 0B B8=3000 → 300.0V, CRC=0x1A7F.

7. Precautions and Safety Warning

• Register Write Restriction:
• Read only registers (such as electrical parameters, fault status) are prohibited from being written, otherwise an exception code 0x03 will be triggered.
• The string register (such as latitude and longitude) needs to be split according to the low byte ofbefore(Example:"123.56" → 31 32 33 2E 35 36) .
• Timer function configuration:
• The scheduled operation time should be set according to actual needs to avoid conflicts.