AC MCB

The LDB9-63 miniature circuit breaker is designed for overload and short-circuit protection in low-voltage AC distribution systems. It is suitable for household, commercial, and light industrial electrical panels, including lighting circuits, socket circuits, resistive loads, small motors, and circuits with higher inrush current requirements.

With B, C, and D curve options, 1P to 4P configurations, and clear handle position indication, the breaker supports flexible circuit protection design while making daily operation and maintenance easier.

• LDB9-63 model configuration: Updated model naming for standard AC miniature circuit breaker applications.
• Multiple rated currents: 1A, 2A, 4A, 6A, 10A, 16A, 20A, 25A, 32A, 40A, 50A, and 63A options.
• Flexible pole selection: Available in 1P, 2P, 3P, and 4P versions for different distribution systems.
• B, C, and D trip curves: B curve for resistive loads, C curve for regular loads, and D curve for circuits with larger transient inrush current.
• Reliable breaking performance: Rated switching capacity Icn is 4.5/6kA according to IEC60898-1.
• Clear operating indication: The handle provides visible contact position status for inspection and maintenance.
• Safety-focused handle design: Sealable handle or padlock bracket option helps prevent dangerous ON/OFF operation changes.
• Long service life: Electrical life reaches 10,000 operations and mechanical life reaches 20,000 operations.

This breaker is recommended for AC circuits requiring compact modular protection, reliable trip performance, and convenient panel installation.

• Residential distribution boards
• Commercial lighting and socket circuits
• Small motor protection circuits
• Industrial control panels
• Heating and resistive load circuits
• AC sub-distribution cabinets

• Select the rated current according to load current, cable size, and protection coordination.
• Choose B, C, or D curve according to the load type and expected inrush current.
• Confirm the pole number and operational voltage before ordering.
• Use the specified terminal tightening torque to ensure reliable conductor connection.
• Install inside a suitable electrical enclosure; the protection degree is IP20 with connected conductors.
• Installation and maintenance should be performed by qualified electrical personnel after power isolation.

Before ordering, provide the required rated current, pole number, tripping curve, breaking capacity, operating voltage, and quantity. For projects using the updated model name, specify LDB9-63 in the order information.

Send us your circuit voltage, rated current, pole configuration, trip curve, breaking capacity requirement, and application scenario. Our team can help recommend the proper LDB9-63 configuration for safe and efficient AC circuit protection.