Onesto 3P 10kA MCB D-Curve DIN

• The Onesto Triple Pole (3P) 10kA D-Curve Miniature Circuit Breaker (MCB) series is expertly designed for robust protection of three-phase electrical circuits, particularly those powering inductive loads such as motors, transformers, and heavy-duty machinery.
• These MCBs offer simultaneous disconnection of all three phases in the event of overcurrents or short circuits, ensuring comprehensive safety.
• With a high short-circuit breaking capacity of 10kA and adherence to the IEC60898-1 standard, this D-Curve series provides reliable performance and enhanced operational integrity for demanding commercial and industrial applications.

Features

• Triple Pole (3P) configuration for complete three-phase circuit protection.
• High short-circuit breaking capacity: 10kA (Icu and Ics).
• D-Curve tripping characteristic: Specifically designed for circuits with high inrush currents (e.g., three-phase motors, transformers).
• Extensive range of current ratings: 1A, 2A, 3A, 4A, 6A, 10A, 16A, 20A, 25A, 32A, 40A, 50A, 63A, 80A, 100A, 125A.
• Thermo-magnetic trip mechanism for precise overload and short-circuit protection.
• Standard Compliance: IEC60898-1.
• Rated Operational Voltage (Ue): 415V AC (for 3P configuration).
• Rated Insulation Voltage (Ui): 415V.
• Rated Impulse Withstand Voltage (Uimp): 4kV.
• Protection Index: IP20.
• Standard DIN rail mountable for convenient installation.

Benefits

• Comprehensive Three-Phase Protection: The 3P design ensures simultaneous interruption of all three phases, critical for safeguarding three-phase motors and equipment from damage due to phase loss or imbalance under fault conditions.
• Optimized for High Inrush Loads: The D-Curve characteristic is tailored to handle the high starting currents of motors, pumps, and transformers without nuisance tripping, ensuring operational continuity for inductive machinery.
• Superior Fault Interruption: A robust 10kA breaking capacity enables the MCB to safely interrupt substantial fault currents, protecting valuable assets and enhancing overall electrical system safety in industrial environments.
• Reliable Dual Protection Mechanism: The thermo-magnetic release provides dependable protection against both prolonged thermal overloads and instantaneous magnetic trips during short circuits.
• Globally Recognized Safety Standards: Adherence to IEC60898-1 assures users of a product that meets international benchmarks for quality, safety, and performance.
• Versatile Current Rating Selection: The wide array of available current ratings allows for precise matching to specific circuit requirements, ensuring optimal protection for diverse three-phase loads.
• Easy Integration: Designed for DIN rail mounting, these MCBs can be quickly and securely installed in standard distribution boards and industrial control panels.

In-Depth Technical Specifications

Ideal Use

• Protection of three-phase electric motors in industrial machinery, pumps, fans, and conveyor systems.
• Safeguarding three-phase transformers and power supply units.
• Circuits supplying three-phase HVAC (Heating, Ventilation, and Air Conditioning) equipment.
• Use in commercial and industrial distribution boards for three-phase loads.
• Applications requiring D-Curve characteristics to prevent nuisance tripping due to high start-up currents.
• Any three-phase system where a 10kA fault withstand capability and reliable overcurrent/short-circuit protection are essential.

Tips

• Verify D-Curve Necessity: Ensure the D-Curve is the correct choice for your specific three-phase application. It is designed for high inrush currents; for resistive or lower inrush loads, a C-Curve may be more appropriate.
• Accurate Current Sizing: Select the MCB's current rating based on the full load current of the three-phase equipment and the conductor size, factoring in any relevant local electrical codes or motor protection guidelines.
• Professional Installation: All installation, wiring, and commissioning should be carried out by a qualified and certified electrician familiar with three-phase systems and applicable safety standards.
• Torque Specifications: Ensure all terminal connections are tightened to the manufacturer's recommended torque values to prevent overheating, arcing, and potential failure.
• Enclosure Requirements: For environments requiring protection against dust, moisture, or harsh conditions, install these IP20 MCBs within a suitable electrical enclosure that provides the necessary higher IP rating.
• System Coordination Study: In complex installations, consider conducting a coordination study with upstream and downstream protective devices to ensure selectivity and prevent unnecessary widespread outages.