Circuit breaker C120N-C125-3 C 125A 3-pole A9N18369

Miniature circuit breaker A9N18369

The A9N18369 miniature circuit breaker with C characteristic and a rated current of 125A is a professional protective solution for residential, commercial, and industrial applications. The device belongs to the Acti9 series by Schneider Electric and protects against overload and short circuits in three-phase installations.

Operating parameters and technical characteristics

The circuit breaker operates at a rated voltage of 400V AC within a frequency range of 50-60 Hz, protecting circuits with currents up to 125A. The C tripping characteristic (5-10×In) guarantees optimal protection for circuits with inductive loads such as motors or transformers, where a slower response to short-term inrush current spikes is required.

The rated short-circuit breaking capacity is 10kA according to the EN 60898 standard for voltages up to 400V, and reaches 20kA according to IEC 60947-2 at a voltage of 230V. The device features an energy limitation class of 3, ensuring effective attenuation of short-circuit energy, and a high level of insulation - the insulation voltage Ui is 500V, and the impulse withstand voltage Uimp reaches 6kV.

IP20 protection and pollution degree 3 guarantee safe use in standard environmental conditions. The operating temperature range from -25°C to +70°C allows for installation in various environmental conditions.

Construction, mounting, and expansion capabilities

The device, with dimensions of 81×81×73mm (width × height × depth), occupies only 4.5 modules on a standard 35mm wide DIN rail, allowing for efficient use of switchboard space. A mounting depth of only 44mm facilitates installation even in shallow enclosures.

The connection system based on tunnel-type terminals enables the connection of single-core wires with cross-sections from 1.5 to 50mm² and multi-core wires from 1 to 35mm². The stripped wire length is a standard 15mm, and the tightening torque is a precisely controlled 3.5 N·m.

The circuit breaker offers expansion possibilities through additional accessories - auxiliary contacts, undervoltage trips, and device status monitoring modules can be mounted. Additionally, there is compatibility with external Vigi residual current devices for comprehensive installation protection.

Standards, certificates, and operational durability

The product meets the requirements of European standards EN/IEC 60898-1 and EN/IEC 60947-2, confirming its suitability for both residential and industrial applications. The circuit breaker holds the EAC certificate and overvoltage category IV, ensuring the highest level of electrical installation safety.

The mechanical durability of the device reaches up to 20000 cycles, while the electrical durability is a standard 5000 cycles for this product class. Power losses are only 4.1W, which minimizes energy consumption during normal device operation.

The circuit breaker is suitable for industrial application according to IEC/EN 60947-2 and can be used as an isolation element in electrical switchboards. The product is covered by Schneider Electric's Green Premium™ program, guaranteeing compliance with the latest environmental regulations and transparency regarding environmental impact throughout the product's entire life cycle.