Onesto 2P 3kA MCB C-Curve DIN

• The Onesto Double Pole (2P) 3kA C-Curve Miniature Circuit Breaker (MCB) series is designed to provide essential protection for two-conductor electrical circuits in residential and light commercial environments.
• These MCBs safeguard against overcurrents and short circuits, featuring a C-Curve tripping characteristic ideal for general-purpose loads requiring simultaneous disconnection of both conductors (e.g., live and neutral, or two phases).
• With a 3kA breaking capacity, they offer a reliable and cost-effective solution for installations where lower fault current levels are anticipated, fully compliant with IEC60898-1 standards.

Features

• Double Pole (2P) configuration for simultaneous protection of two conductors.
• Rated short-circuit breaking capacity (Icu & Ics): 3kA.
• C-Curve tripping characteristic: Suitable for general purpose, resistive, and moderately inductive loads.
• Comprehensive range of current ratings: 1A, 2A, 3A, 4A, 6A, 10A, 16A, 20A, 25A, 32A, 40A, 50A, 63A.
• Thermo-magnetic trip mechanism for effective overload and short-circuit protection.
• Standard Compliance: IEC60898-1.
• Rated Operational Voltage (Ue): 415V AC (for 2P).
• Rated Insulation Voltage (Ui): 415V.
• Rated Impulse Withstand Voltage (Uimp): 4kV.
• Protection Index: IP20.
• Designed for easy DIN rail mounting.

Benefits

• Enhanced Safety: Double pole design ensures complete isolation of both protected conductors, critical for safety in specific single-phase or two-phase applications.
• Reliable Circuit Protection: 3kA breaking capacity provides adequate protection for circuits with lower prospective fault currents, common in residential and small commercial setups.
• Versatile Application: C-Curve characteristic is ideal for a wide variety of common loads, minimizing nuisance tripping while providing effective protection.
• Dual Protection Mechanism: Thermo-magnetic trip unit offers precise protection against both sustained overloads (thermal) and immediate short circuits (magnetic).
• International Standard Compliance: Adherence to IEC60898-1 ensures recognized quality, safety, and performance.
• Cost-Effective Solution: Offers a balance of performance and value for applications where a higher breaking capacity is not essential.
• Simplified Installation: Standard DIN rail compatibility ensures quick and convenient mounting in most consumer units and distribution boards.

In-Depth Technical Specifications

Ideal Use

• Residential installations requiring protection of circuits like water heaters, small air conditioning units, or dedicated appliance circuits where 2P switching is desired or mandated.
• Light commercial applications for general power circuits, lighting, or small machinery in environments with confirmed low fault current levels.
• Circuits where simultaneous disconnection of live and neutral (or two phases) is required for safety or functional reasons.
• Consumer units and small distribution boards in installations where the prospective short circuit current (PSCC) is below 3kA.

Tips

• Critical Fault Level Check: It is essential to verify that the installation's prospective short circuit current (PSCC) does not exceed 3kA. If it does, an MCB with a higher breaking capacity (e.g., 6kA or 10kA) must be used to ensure safety.
• Application Suitability: Confirm if a 2P MCB is necessary for the application (e.g., for complete isolation or for specific two-phase loads).
• Correct Amperage Sizing: Always select an MCB with a current rating that matches the circuit's conductor size and the load's normal operating current.
• Professional Installation: Ensure installation is carried out by a qualified electrician in accordance with all local electrical codes and safety regulations.
• Secure Connections: Properly torque all terminal connections to the manufacturer's specifications to prevent overheating and ensure reliable operation.
• Enclosure for Protection: While IP20 rated, these MCBs should be installed within a suitable enclosure to provide adequate protection against dust, moisture, and other environmental factors.