ABB PR121/P-LSI E1-E6 Low Voltage Circuit Breaker Relay

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1. Product Overview

The ABB PR121/P-LSI E1-E6 is an electronic relay for low-voltage circuit breaker protection, designed for monitoring and protecting against overload, short-circuit, and earth faults in distribution systems. It is compatible with ABB PR series low-voltage circuit breakers, offering precise protection and reliable operation. Supports multiple protection functions including overcurrent (L), short-circuit (S), and earth fault (I) protection.

2. Technical Specifications

3. Key Features and Benefits

• Precise protection: Overcurrent, short-circuit, and earth fault protection for electrical safety.

• High compatibility: Seamlessly integrates with ABB PR series low-voltage circuit breakers.

• Fast response: Quickly trips to reduce risk of equipment damage.

• Easy installation and commissioning: DIN rail or panel mounting for fast wiring and setup.

• Multi-function display & alarm: LED or LCD for real-time fault indication and maintenance convenience.

4. Typical Applications

• Low-voltage distribution systems in industrial facilities

• Commercial building electrical distribution panels

• Small to medium-sized power plant distribution protection

• Machinery and equipment control system protection

• Low-voltage branch circuit protection in distribution networks

5. Installation & Usage Notes

1. Circuit breaker compatibility: Must be used with ABB PR series breakers to ensure proper protection.

2. Supply voltage: Confirm relay supply voltage matches system (DC or AC).

3. Correct wiring: Follow product wiring diagram for main circuit and relay contacts.

4. Environmental conditions: Avoid high temperature, humidity, and corrosive environments.

5. Regular inspection: Check relay status and contact operation to ensure timely tripping in case of faults.

The structure and details of the product：

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