Onesto 2P 10kA MCB D-Curve DIN

• The Onesto Double Pole 10kA D-Curve Miniature Circuit Breaker (MCB) series is engineered to deliver robust and reliable protection for electrical circuits, especially those characterized by high inrush currents such as motors and transformers.
• These 2-pole MCBs ensure the simultaneous disconnection of two conductors (e.g., two phases, or phase and neutral) during overcurrent or short-circuit events.
• With a high breaking capacity of 10kA and full compliance with the IEC60898-1 standard, these D-Curve MCBs are an excellent choice for demanding residential, commercial, and light industrial applications requiring enhanced safety and operational integrity for inductive loads.

Features

• Double Pole (2P) configuration for simultaneous protection of two conductors.
• High short-circuit breaking capacity: 10kA (Icu and Ics).
• D-Curve tripping characteristic: Ideal for circuits with high inrush currents (e.g., motors, transformers, certain lighting systems).
• Comprehensive range of current ratings: 2A, 3A, 4A, 6A, 10A, 16A, 20A, 25A, 32A, 40A, 50A, 63A, 80A, 100A, 125A.
• Thermo-magnetic trip mechanism for effective overload and short-circuit protection.
• Standard Compliance: IEC60898-1.
• Rated Operational Voltage (Ue): 415V AC (for 2P configuration).
• Rated Insulation Voltage (Ui): 415V.
• Rated Impulse Withstand Voltage (Uimp): 4kV.
• Protection Index: IP20.
• Designed for easy DIN rail mounting in standard enclosures.

Benefits

• Enhanced Safety for Two-Wire Circuits: Double pole design ensures complete and simultaneous isolation of both protected conductors, crucial for safety in two-phase systems or single-phase systems requiring neutral switching.
• Optimized for Inductive Loads: D-Curve characteristic accommodates the high inrush currents typical of motors, transformers, and other inductive equipment without nuisance tripping, ensuring system uptime.
• Superior Fault Current Interruption: A 10kA breaking capacity allows the MCB to safely interrupt significant fault currents, protecting valuable downstream equipment and enhancing overall installation safety.
• Reliable Dual Protection: The thermo-magnetic mechanism offers precise and dependable protection against both thermal overloads (prolonged overcurrents) and magnetic trips (instantaneous short circuits).
• Internationally Recognized Quality: Compliance with IEC60898-1 signifies adherence to global standards for safety, performance, and reliability.
• Versatile Application Range: The wide selection of current ratings makes these MCBs suitable for a broad spectrum of applications, from small motor protection to larger sub-main circuits.
• Simplified Installation: Standard DIN rail compatibility ensures quick, easy, and secure mounting in most modern distribution boards and electrical panels.

In-Depth Technical Specifications

Ideal Use

• Protection of electric motors (e.g., pumps, fans, HVAC units, workshop machinery).
• Primary or secondary side protection for transformers.
• Circuits supplying equipment with significant inrush current characteristics (e.g., some types of industrial lighting, power conversion units).
• Two-phase loads in commercial and industrial installations.
• Single-phase applications where regulatory or safety requirements mandate simultaneous switching and protection of both live and neutral conductors.
• Sub-distribution boards requiring robust 10kA D-Curve protection for critical loads.

Tips

• Application-Specific Selection: Always ensure the D-Curve characteristic is appropriate for your load. Using a D-Curve MCB on purely resistive or low-inrush capacitive loads might lead to inadequate protection against certain overcurrent conditions.
• Correct Current Rating: Select an MCB with a current rating that matches the protected circuit's conductors and the load's normal operating current, while also considering the inrush characteristics.
• Professional Installation: Installation must be performed by a qualified and licensed electrician in strict accordance with all applicable local electrical codes and safety regulations.
• Secure Connections: Ensure all terminal connections are tightened to the manufacturer's specified torque values to prevent loose connections, overheating, and potential hazards.
• Environmental Considerations: While IP20 rated, these MCBs should be installed within a suitable electrical enclosure to provide adequate protection against dust, moisture, and other environmental contaminants, especially if a higher IP rating is necessary for the installation environment.
• System Coordination: For optimal safety and selectivity, consider the coordination of this MCB with upstream and downstream protective devices within the electrical system.