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ABB RLM611 Motor Protection Relay

1. Product Description

The ABB RLM611 is a high-performance motor protection relay designed to safeguard electric motors from overload, short circuit, phase loss, stall, and other abnormal conditions. The relay integrates advanced protection logic and diagnostic functions, providing real-time motor monitoring to enhance operational safety and reliability. The RLM611 is suitable for industrial automation, power systems, and AC motor protection in various electromechanical equipment.

2. Technical Specifications

• Model: RLM611

• Module Type: Motor protection relay

• Rated Operating Current: 0.1–100 A (adjustable)

• Control Supply Voltage: 24–240 V AC/DC

• Phase Current Measurement: Three-phase current input

• Protection Functions: Overload, short-circuit, phase loss, stall, under/over voltage

• Response Time: Typically 20–100 ms (depending on function)

• Communication Interface: Optional PROFIBUS, Modbus (depending on model)

• Operating Temperature: –20°C ~ +60°C

• Storage Temperature: –40°C ~ +85°C

• Mounting: DIN rail or panel mounting

• Protection Rating: IP20

• Dimensions: Approx. 90 × 45 × 100 mm (H × W × D)

3. Features & Advantages

• Comprehensive protection: overload, short circuit, phase loss, stall, etc.

• Adjustable current range to suit various motor ratings

• Fast response protects motor from transient faults

• Easy installation and configuration via DIN rail or panel mounting

• Integrated diagnostics for real-time motor status monitoring

• Industrial-grade design: high reliability, resistant to temperature, vibration, and interference

4. Application Areas

• Industrial motor protection (pumps, fans, compressors, motors)

• Motor protection in automated production lines

• Electric motor protection in power systems

• Water treatment, power plants, manufacturing, and heavy industry

• Motor status monitoring and automatic shutdown protection

5. Precautions / Installation Notes

1. Disconnect power before installation to ensure safety.

2. Set relay protection values according to motor rated current to avoid misoperation or no protection.

3. Ensure correct wiring to avoid short circuits or phase misconnection.

4. Provide adequate ventilation around the relay to prevent overheating.

5. Avoid dust, moisture, and corrosive gases entering the relay.

6. Regularly check relay operation and wiring for long-term reliable operation.

7. Use original or compatible relays when replacing to ensure system compatibility.

The structure and details of the product：

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