Electronic Release Breaker

The LDM9EL Series is a smart molded case circuit breaker that integrates a residual current relay, contactor, and MCCB into one compact protection device. It is designed for AC400V three-phase four-wire systems with a grounded neutral point, providing protection against grounding faults, overcurrent, short circuits, phase loss, and overvoltage.

Compared with traditional thermal-magnetic units, the electronic release design offers adjustable protection parameters, higher setting accuracy, and more stable performance under different installation conditions. It is suitable for distribution panels, industrial equipment, and intelligent power management systems that require dependable monitoring and communication.

• Integrated smart protection: Combines residual current protection, automatic reclosing, overload protection, short-circuit protection, phase-loss protection, and overvoltage protection in one device.
• Electronic adjustable setting: Rated current can be adjusted according to load conditions, with electronic current adjustment from 0.4 to 1.0 times In in 0.1 steps.
• Digital interface display: The 5-digit display can show real-time voltage, current, and residual current values for easier operation and maintenance.
• Automatic reclosing function: Supports reclosing time from 20s to 60s, helping reduce downtime after temporary faults when conditions are safe.
• Communication ready: RS485, RS232, GPRS, and Ethernet communication options support remote monitoring and networked power management.

Three-phase four-wire power supply systems, industrial distribution cabinets, electrical equipment protection, smart power control panels, factories, commercial buildings, photovoltaic and energy-related power systems.

• Ambient temperature: -20°C to +60°C.
• Altitude: not exceeding 2000m; derating is required for higher altitude installations.
• Pollution level: III; installation category: III.
• Relative humidity may reach 90% at 25°C, with attention to condensation caused by temperature changes.
• Power supply sine wave distortion should be less than 5%.

The breaker can be equipped with RS485, RS232, GPRS, or Ethernet communication interfaces. Protection parameters can be set through a programmer, making the device suitable for projects that require remote monitoring, data collection, and customized communication protocols.

Please send your required frame rating, rated current, residual current setting, communication interface, pole configuration, and estimated order quantity. Our technical team will help confirm the suitable model and provide product data, wiring guidance, and a competitive quotation.