Schneider Electric MT12N1 Air Circuit Breaker

Product Details

MT12N1 Product Description

The Schneider Electric MT12N1 is a high-performance air circuit breaker engineered for seamless integration within MT series power distribution and industrial control architectures. Designed to deliver reliable overcurrent and short-circuit protection at the power layer, the MT12N1 serves as a foundational protection component across multi-tier automation systems — from the incoming supply bus through to field-level distribution panels. Its compact frame, standardised mounting interface, and robust interrupting capacity make it an essential element in any engineered control cabinet solution where system consistency, long-term reliability, and maintainability are non-negotiable requirements.

In modern industrial automation environments, the power protection layer is not an isolated function — it is deeply integrated with the control layer, I/O layer, communication layer, and HMI layer. The MT12N1 is specifically designed to support this layered architecture philosophy. Whether deployed in a standalone MCC (Motor Control Centre), a distributed control panel, or a centralised power distribution board feeding Schneider Electric Modicon M340 or M580 PLCs, the MT12N1 provides the upstream protection integrity that the entire downstream automation system depends upon.

The MT12N1 is most effectively deployed as part of a fully coordinated Schneider Electric automation and power management ecosystem. At the control layer, Schneider Electric Modicon M340 and M580 CPUs provide the processing backbone for process logic, while the MT12N1 ensures that the power supply feeding these controllers is protected against fault conditions that could cause unplanned shutdowns. The Modicon X80 I/O platform — including digital input modules (DDI) and digital output modules (DDO) — relies on stable, uninterrupted power delivery that the MT12N1 upstream protection guarantees.

At the communication layer, Schneider Electric ConneXium industrial Ethernet switches and BMXNOE0110 Ethernet communication modules enable PROFINET and Modbus TCP/IP connectivity between the PLC, SCADA, and field devices. The MT12N1, when equipped with a Micrologic electronic trip unit, can itself participate in the communication architecture — reporting trip events, load current, and energy data directly to EcoStruxure Power Monitoring Expert or to a Modbus-capable SCADA system, enabling predictive maintenance and real-time power quality monitoring.

At the HMI layer, Schneider Electric Magelis HMIGTO and HMISCU operator panels provide local visualisation of process states. Integrating power protection status from the MT12N1 into the HMI display — via Modbus or EcoStruxure — gives operators immediate visibility of upstream protection status without requiring separate instrumentation. This integration reduces diagnostic time and supports faster fault recovery.

At the power layer, the MT12N1 works in coordination with Schneider Electric Acti9 iC60 miniature circuit breakers and iDPN Vigi residual current devices for downstream branch protection, creating a fully coordinated protection hierarchy from the main incomer to individual field circuits. Schneider Electric Phaseo ABL8 power supplies provide regulated 24 V DC to the PLC and I/O racks, with the MT12N1 protecting the AC supply feeding these units.

At the execution layer, Schneider Electric Altivar ATV320 and ATV630 variable speed drives control motor loads across conveyor, pump, and fan applications. The MT12N1 provides upstream short-circuit protection for the drive input circuits, ensuring that a drive fault does not propagate upstream to the main distribution board. Schneider Electric TeSys D and TeSys K contactors and overload relays complete the motor starter assemblies downstream of the MT12N1.

At the protection and redundancy layer, the MT12N1 supports zone-selective interlocking (ZSI) when used with compatible Micrologic trip units, enabling faster, more selective fault clearance in complex busbar systems. This capability is critical in continuous process industries — petrochemical, water treatment, and power generation — where unselective tripping of upstream breakers can cause widespread process disruption.

Manufacturing & Automotive Assembly: In automotive body shop and paint line applications, the MT12N1 protects the main power distribution board feeding robot controllers, servo drive panels, and conveyor motor control centres. Its high breaking capacity and selective coordination with downstream MCBs ensure that a fault in one production cell does not interrupt adjacent lines, maintaining overall equipment effectiveness (OEE).

Power Generation & Utilities: In power plant auxiliary systems and substation control buildings, the MT12N1 serves as the main incomer protection for LV switchgear feeding protection relay panels, UPS systems, and battery chargers. Its IEC 61850 communication capability — via Micrologic trip unit — enables integration with digital substation automation systems, supporting remote monitoring and event logging.

Petrochemical & Oil and Gas: In hazardous area control buildings and safe-area MCC rooms, the MT12N1 provides reliable upstream protection for variable speed drive panels and motor control centres serving pumps, compressors, and agitators. Its robust electronic trip unit supports precise overload and short-circuit settings required by process safety management (PSM) programmes.

Water & Wastewater Treatment: In water treatment plant MCC rooms, the MT12N1 protects the main distribution board feeding pump motor starters, blower drives, and UV disinfection systems. Its energy metering capability — when equipped with Micrologic E trip unit — supports energy management and compliance reporting for utility operators.

Mining & Minerals Processing: In underground and surface mining electrical rooms, the MT12N1 provides main incomer protection for conveyor drive panels, crusher motor starters, and ventilation fan MCCs. Its withdrawable chassis option simplifies maintenance and replacement in environments where minimising downtime is critical.

Marine & Offshore: In vessel main switchboards and offshore platform power distribution systems, the MT12N1 — when specified to marine classification society requirements — provides reliable generator and bus protection. Its compact frame and high breaking capacity make it suitable for space-constrained marine electrical rooms.

Q1: Is the MT12N1 compatible with Schneider Electric EcoStruxure Power Monitoring Expert for real-time energy data integration? Yes. When the MT12N1 is equipped with a Micrologic E or Micrologic P electronic trip unit, it supports Modbus RTU and Modbus TCP/IP communication, enabling direct integration with EcoStruxure Power Monitoring Expert (PME) and EcoStruxure Power Automation System (PAS). This allows real-time monitoring of load current, energy consumption, power quality parameters, and trip event logs from the SCADA or energy management system. For IEC 61850 integration in digital substation applications, the Micrologic 6.0E trip unit with IEC 61850 communication module is recommended.

Q2: How does the MT12N1 support selective coordination in a multi-tier protection architecture with downstream Acti9 MCBs and TeSys motor starters? The MT12N1 supports zone-selective interlocking (ZSI) when used with compatible Micrologic trip units, enabling it to communicate with downstream Compact NSX or PowerPact circuit breakers to achieve faster, more selective fault clearance. In a typical coordination study, the MT12N1 is set as the upstream device with a short-time delay (STD) that allows downstream devices to clear faults within their zone before the MT12N1 trips. Schneider Electric's EcoStruxure Power Design — Ecodial software provides coordination curves and selectivity tables to verify the protection hierarchy across the full distribution system.

Q3: What is the warranty coverage for the MT12N1, and what is the typical lead time for in-stock units? All MT12N1 units supplied by NANKMOS are covered by a 12-Month Warranty against manufacturing defects and functional failure under normal operating conditions. Units are pre-shipment tested to verify mechanical operation, trip unit calibration, and communication function where applicable. In-stock units are typically dispatched within 3–5 business days. For project-specific requirements — including withdrawable chassis configurations, specific Micrologic trip unit variants, or accessories such as auxiliary contacts, shunt trips, and undervoltage releases — please contact [email protected] or call +86 18359268345 to confirm availability and lead time.