ABB RER103

Description

Technical Parameters ABB RER103

Product Advantages and Features ABB RER103

1. Adjustable sensitivity, selective protection

   ABB RER103 offers adjustable earth fault sensitivity ranging from 30mA to 10A, which can be precisely set according to the requirements of different low-voltage systems. This allows for selective tripping, ensuring that only the faulty circuit is disconnected while the rest of the power supply network remains operational, minimizing power outages and improving system reliability.

2. Fast tripping response, excellent fault handling

   The relay achieves a tripping time of less than 50ms when the fault current reaches 10 times the rated sensitivity value. This rapid response can quickly cut off the fault circuit, effectively preventing the expansion of earth fault hazards such as insulation breakdown and electrical fires, which is far superior to traditional electromechanical earth fault protection devices.

3. Compact design, easy installation and integration

   ABB RER103 adopts a small-sized modular structure that can be directly mounted on DIN rails in the distribution cabinet, without occupying excessive installation space. It features simple wiring terminals and clear parameter adjustment knobs, which reduces the difficulty of on-site installation and debugging, and is especially suitable for retrofitting old low-voltage distribution systems.

4. High reliability and low maintenance cost

   ABB RER103 uses high-quality electronic components and a sealed circuit design, which has good resistance to electromagnetic interference and environmental aging. The device has no moving parts, so it does not require regular mechanical maintenance, and its service life can reach more than 15 years, significantly reducing the long-term operation and maintenance costs of the power supply system.

Application Cases ABB RER103

1. Commercial building low-voltage distribution system protection

   In a large shopping mall’s LV distribution network project, ABB RER103 is installed in each floor’s distribution box to provide earth fault protection for lighting, air conditioning and power socket circuits. The adjustable sensitivity setting realizes selective tripping, and when a ground fault occurs in a certain shop’s socket circuit, only the corresponding circuit breaker trips, without affecting the power supply of the entire floor, ensuring the normal operation of the mall.

2. Industrial workshop motor control circuit protection

   In an automobile parts processing workshop project, the relay is configured for the control circuit of each three-phase motor. It can quickly detect the earth fault caused by motor insulation damage, and trip the circuit breaker before the fault expands to burn the motor winding. This application reduces the motor maintenance rate of the workshop by 25% and saves a lot of production downtime costs.

3. Residential community power supply safety protection

   In a residential area renovation project, ABB RER103 is used to upgrade the earth fault protection function of the household distribution box. The 30mA sensitivity setting can effectively protect residents from electric shock hazards when using household appliances, while the selective tripping function avoids the situation where a single household fault causes a power outage in the entire building, improving the power supply quality of the community.

Competitor Comparison

Selection Suggestions

1. For low-voltage distribution systems of commercial buildings, industrial workshops and residential communities that require selective earth fault protection, ABB RER103 is preferred due to its wide adjustable sensitivity range and fast tripping response.
2. If the project involves retrofitting old distribution cabinets with limited installation space, the compact modular design of this relay can effectively solve the space constraint problem.
3. For users pursuing high reliability and low maintenance costs, ABB RER103 is a more cost-effective choice compared with similar products with complex structures and high maintenance requirements.

Precautions

1. During installation, ensure that the CT secondary side wiring is correct, and avoid polarity reversal, which may lead to incorrect earth fault current detection and protection misoperation.
2. When setting the sensitivity parameter, it should be determined according to the actual leakage current of the system. Too low a setting may cause frequent tripping, while too high a setting may fail to provide effective protection.
3. Regularly check the connection status of the relay terminals to prevent poor contact caused by vibration or dust accumulation, which may affect the normal operation of the device.
4. During maintenance, cut off the operating power supply first, and do not disassemble the relay casing at will to avoid damaging the internal circuit components.

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