Schneider Electric Acti9 C120N MCB 80-125A Main Incomer

Overview

Schneider Electric Acti9 C120N is a high-current miniature circuit breaker (MCB) extending the proven Acti9 platform up to 125A, purpose-built for main incomer protection and heavy sub-distribution circuits where standard 63A MCBs fall short. Rated from 80A to 125A with a choice of B, C, and D tripping curves and up to 10kA breaking capacity, the C120N bridges the gap between compact modular MCBs and bulkier moulded case circuit breakers, giving panel builders a DIN-rail-mountable solution for higher current applications without sacrificing the space efficiency of the Acti9 range.

Backed by manufacturer datasheet documentation, Seven Star LLC proudly supplies the Schneider Electric Acti9 C120N to panel builders, contractors, and facility engineers across Oman and the GCC. Supplied on request, the C120N is deployed as the main incomer breaker in distribution boards serving commercial buildings, light industrial plants, and utility rooms throughout Muscat, Sohar, and Salalah, where reliable high-current protection at the point of supply is essential for uninterrupted operations.

Operating Principle of the Schneider Electric Acti9 C120N

The Schneider Electric Acti9 C120N uses a combined thermal-magnetic tripping mechanism conforming to IEC/EN 60898-1. The thermal element, a bimetallic strip, responds to sustained overload currents by bending as it heats, mechanically releasing the trip latch once a preset thermal threshold is exceeded – this protects cables and downstream equipment from slow, cumulative overheating caused by excess load. For genuine short-circuit conditions, the magnetic element engages instantaneously: a solenoid coil senses the sudden current surge and drives the trip mechanism within milliseconds, well before conductor insulation or connected equipment can sustain damage.

Because the C120N is a purely electromechanical device with no auxiliary power requirement, it provides protection even during upstream supply anomalies, a critical trait for a main incomer breaker that must remain dependable regardless of grid conditions. The B, C, and D curve variants tune the magnetic trip threshold to the inrush characteristics of the connected load – B curve for resistive and lighting circuits, C curve for general distribution and moderate inrush loads, D curve for transformers and motor loads with high starting currents – letting engineers match trip sensitivity precisely and avoid nuisance tripping on legitimate startup surges.

Engineering Design of the Schneider Electric Acti9 C120N

Physically, the Schneider Electric Acti9 C120N retains the compact modular footprint of the Acti9 family while accommodating the internal components needed for higher current handling, available in 1P, 2P, 3P, and 4P configurations to match single-phase and three-phase distribution architectures. The moulded case is manufactured from a self-extinguishing, high-impact thermoplastic that resists mechanical stress and arc tracking, and every C120N snaps directly onto a standard 35mm symmetrical DIN rail without tools, matching the mounting convention used throughout modern low-voltage switchboards.

The toggle operating handle features a distinctive trip-free mechanism with clear ON/OFF/tripped indication, so maintenance personnel can visually confirm breaker status without opening the panel door. Terminal connections accept the larger cable cross-sections associated with 80–125A circuits, and the terminal shrouds meet IP20 finger-safe requirements when the panel is closed. The C120N also accepts the Acti9 range of add-on auxiliaries – including Vigi earth-leakage blocks, auxiliary/alarm contacts, and shunt trips – allowing the base breaker to be upgraded into a more comprehensive protection and monitoring device without changing the panel layout.

Key Features

The Schneider Electric Acti9 C120N delivers a dependable feature set for engineers specifying main incomer and heavy sub-distribution protection:

• Rated current range from 80A to 125A, extending Acti9 modular MCB protection well beyond standard 63A distribution circuits.
• Breaking capacity up to 10kA (Icn) at 230/400V AC, conforming to IEC/EN 60898-1 for reliable short-circuit interruption.
• Available in B, C, and D tripping curves to match resistive, general distribution, and high-inrush motor or transformer loads.
• 1P, 2P, 3P, and 4P pole configurations covering single-phase and three-phase incomer and feeder applications.
• Combined thermal-magnetic trip unit providing both overload and short-circuit protection in a single compact device.
• Tool-free mounting on standard 35mm symmetrical DIN rail for fast panel assembly and replacement.
• Trip-free toggle mechanism with clear visual ON/OFF/tripped status indication for safe maintenance.
• Compatible with Acti9 Vigi earth-leakage add-on modules and auxiliary contacts for expanded protection and remote monitoring.

Industrial Applications

The Schneider Electric Acti9 C120N is specified as the main incomer breaker in low-voltage distribution boards across commercial and light industrial facilities throughout the Sultanate of Oman, protecting the point where utility or generator supply enters a building’s internal distribution network. In Muscat’s commercial towers, retail complexes, and hospitality developments, the C120N is used to segregate and protect riser sub-mains feeding floor-by-floor distribution boards, while in light manufacturing plants across Oman it protects motor control panels and workshop sub-distribution circuits carrying loads beyond the range of standard 63A MCBs.

Working closely with plant engineers in the region, Seven Star LLC distributes the Schneider Electric Acti9 C120N to contractors and consulting engineers working on projects in the Sohar and Salalah economic zones, where warehousing, logistics, and light industrial facilities rely on dependable higher-current circuit protection for compressor rooms, workshop panels, and building services distribution. The breaker’s compatibility with Vigi earth-leakage modules also makes it a preferred choice for GCC facilities upgrading older installations to meet current earth-fault protection requirements without a full panel rebuild.

Technical Specifications

Key technical parameters for the Schneider Electric Acti9 C120N are summarized below.

Also available: Schneider Electric Prisma iPM Modular Switchboard

Request a Quote for Schneider Electric Acti9 C120N MCB 80-125A Main Incomer

Facility engineers and panel builders across Oman and the GCC can request a formal RFQ for the Schneider Electric Acti9 C120N through Seven Star LLC, with lead time and availability confirmed at quotation. Technical datasheets, wiring diagrams, and curve-selection guidance are available on request from our instrumentation and low-voltage products division. With fast quotation turnaround and technical support, Seven Star LLC provides a formal quotation, manufacturer documentation, and dedicated technical support for every Schneider Electric Acti9 C120N order.

Related Products

• ABB VD4/P 12.12.25 Vacuum Circuit Breaker
• Schneider Electric Compact INS250 Load Break Switch
• Schneider Electric Compact NSX MicroLogic Trip Unit
• Schneider Electric Acti9 Vigi iC60 RCD Add-On Module
• Schneider Electric Vamp 257 Feeder Protection Relay
• Schneider Electric iQuick PRD40r Surge Protective Device