ABB RER103-MM

Description

Technical Parameters ABB RER103-MM

Product Advantages and Features ABB RER103-MM

1. High-Precision Earth Fault Detection, Ensuring Power Supply Safety

   ABB RER103-MM adopts a dedicated zero-sequence current detection algorithm, which can accurately identify earth faults in low-voltage circuits with a detection range of 0.01A to 1A. It supports adjustable tripping time settings, which can realize selective tripping according to the fault level, avoiding large-scale power outages caused by minor faults and ensuring the continuous operation of critical loads.

2. Compact Design and Easy Installation, Saving Space and Costs

   ABB RER103-MM features a DIN rail mounting design with a compact size, occupying only 2 standard DIN rail modules. It can be directly installed in low-voltage distribution cabinets without additional installation brackets, which greatly saves cabinet space and reduces installation costs. The clear terminal marking and simple wiring design shorten the on-site commissioning time.

3. Simple Communication Function, Realizing Remote Monitoring

   ABB RER103-MM is equipped with an RS-485 communication interface supporting Modbus RTU protocol, which can realize data interaction with upper monitoring systems such as PLC and SCADA. It can upload fault information, operating status, and setting parameters in real time, allowing maintenance personnel to perform remote fault diagnosis and parameter adjustment without on-site operation.

4. Strong Anti-Interference Performance, Adapting to Complex Industrial Environments

   ABB RER103-MM uses industrial-grade electronic components and built-in EMI filtering circuits, which can resist electromagnetic interference from motors, inverters, and other equipment in industrial sites. Its wide operating temperature range ensures stable operation in harsh environments such as high temperature and low temperature, reducing the failure rate of the protection system.

Application Cases

1. Industrial Motor Circuit Protection

   In the motor control circuit of a textile factory, ABB RER103-MM is installed to monitor the zero-sequence current of the motor. When insulation damage occurs in the motor winding and causes an earth fault, the relay quickly detects the fault current and sends a tripping signal to the circuit breaker, cutting off the power supply in time to avoid motor burnout and fire accidents, ensuring the continuous operation of the textile production line.

2. Building Power Supply Network Protection

   In the power supply system of a commercial building, ABB RER103-MM is configured in each floor’s distribution box to realize segmented earth fault protection. When an earth fault occurs in the lighting or power socket circuit of a certain floor, the relay trips selectively, only cutting off the power supply of the faulty floor, while other floors remain powered, improving the reliability of the building’s power supply.

3. Low-Voltage Distribution System for Food Processing Plants

   In the low-voltage distribution system of a food processing plant, ABB RER103-MM is used to protect the circuits of food processing equipment. Due to the humid environment in the plant, the risk of earth faults is relatively high. The relay’s high-precision detection function can identify small leakage currents in time, preventing electric shock accidents of operators and ensuring the safety of production personnel and equipment.

Competitor Comparison

Selection Suggestions

1. For low-voltage distribution systems, industrial motor circuits, and building power supply networks that require high-precision earth fault protection, ABB RER103-MM is preferred for its compact design, adjustable detection range, and cost-effectiveness.
2. When selecting, confirm the rated voltage of the relay according to the actual power system voltage, and select the appropriate CT ratio based on the rated current of the protected circuit to ensure accurate fault detection.
3. For applications requiring remote monitoring, configure the RS-485 communication module and ensure compatibility with the upper monitoring system’s protocol.

Precautions

1. When installing ABB RER103-MM, wear an anti-static wristband to prevent static electricity from damaging the internal circuit board; ensure correct wiring of the zero-sequence current transformer to avoid reverse connection, which may cause protection misoperation.
2. Parameter configuration must be carried out in accordance with the ABB official manual, and the fault detection threshold and tripping time should be set according to the actual characteristics of the protected circuit, avoiding blind configuration that may lead to protection failure or unnecessary tripping.
3. During long-term operation, regularly check the tightness of the wiring terminals to prevent poor contact caused by vibration; regularly calibrate the relay to ensure the accuracy of fault detection.
4. In humid environments such as food processing plants and textile factories, install the relay in a sealed enclosure to prevent moisture from entering the internal circuit and causing short circuits.

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