Lear LIEL-4 Circuit Breaker Overview

Built for advanced safety in three-phase systems, this earth leakage breaker interrupts current flow when leakage exceeds 30mA, helping to prevent shocks and fire risks. The fast response time and standards compliance make it ideal for commercial or industrial use.

Lear LIEL-4 Circuit Breaker Benefits and Features

• Quick Trip Time: ≤ 100ms for prompt isolation of leakage faults
• Triple Pole Operation: Interrupts current across all three phases
• Standards Approved: Meets IEC 61008 and VC 8035 for global safety compliance
• Test Button Functionality: Routine testing ensures continued protection
• Complementary Protection: Designed for use with an MCB to cover overload scenarios

Steps to Follow for Installing the Lear LIEL-4 Circuit Breaker

Preparation:

1. Ensure the main power supply is turned off
2. Verify installation location within the distribution board
3. Confirm compatibility with the existing MCB and circuit load

Installation The Lear LIEL-4 Circuit Breaker

1. Mount the breaker onto a DIN rail inside the panel
2. Connect the live and neutral wires to their corresponding terminals
3. Connect the output terminals to downstream equipment
4. Restore power and press the test button to confirm correct function

Cleanup & Maintenance:

• Periodically press the test button to verify operation
• Keep terminals clean and free from dust or corrosion
• Ensure the enclosure is dry and free from mechanical obstruction

A Few Scenarios Where the Breaker Can Be Used:

• Industrial machinery installations requiring sensitive leakage protection
• Three-phase distribution panels in commercial buildings
• Sub-panels serving high-demand equipment with safety requirements
• Electrical systems in environments prone to humidity or leakage risks
• Safety upgrades in legacy installations lacking residual current protection

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Health and Safety

Installation must be performed by a licensed electrician. This device does not provide overload protection and must be paired with a suitable MCB. Always disconnect power before maintenance. Test regularly to maintain safety compliance.

Want more tips for installing a circuit breaker? Click here to learn more.