Schneider Electric MT08N1 Air Circuit Breaker

Product Details

MT08N1 Product Description

The Schneider MT08N1 is not a standalone protective device — it is a precision-engineered node within a layered LV power and control architecture. In modern industrial facilities, the MT08N1 functions as the primary or tie circuit breaker within a Masterpact MT switchgear assembly, coordinating upstream and downstream protection across the full electrical distribution hierarchy.

At the control layer, the MT08N1 interfaces with Schneider Electric's EcoStruxure Power architecture, enabling real-time monitoring and remote trip/close commands via Modbus RTU or IEC 61850 protocol. When paired with a Micrologic 6.0 or 7.0 trip unit, the breaker gains advanced metering, harmonic analysis, and event logging — data that feeds directly into SCADA platforms such as EcoStruxure Power Monitoring Expert (PME) or third-party systems via OPC-UA gateways.

At the I/O and protection layer, the MT08N1 coordinates with downstream Compact NSX or PowerPact H/J/L-frame molded case circuit breakers (MCCBs) to establish a fully selective protection cascade. Proper selectivity between the MT08N1 and downstream MCCBs ensures that a fault at a branch circuit does not propagate to the main bus, maintaining continuity of supply to critical loads such as motor control centers (MCCs), UPS systems, and process drives.

At the communication layer, the MT08N1 supports integration with IFM or Schneider communication modules that translate breaker status, alarm signals, and metering data onto plant-wide Ethernet/IP or PROFIBUS DP networks. This enables the breaker's operational state to be visible within a Modicon M580 or M340 PLC environment, where logic controllers can execute load-shedding sequences, interlock schemes, or automatic transfer switching (ATS) routines based on real-time breaker feedback.

At the power layer, the MT08N1 is typically installed in conjunction with Schneider Electric Prisma or Okken LV switchgear panels, which provide the structural busbar system, cable compartments, and earthing infrastructure. The drawout version of the MT08N1 allows hot-swap maintenance without de-energising adjacent feeders — a critical advantage in continuous-process industries such as petrochemical, pharmaceutical, and data centre environments.

At the HMI layer, operators interact with the MT08N1's status through Magelis HMIGTO or HMISCU panel PCs running Vijeo Designer applications, or through web-based dashboards served by EcoStruxure Power Advisor. Alarm annunciation, trip cause identification, and remote reset commands are all accessible without physical access to the switchgear room, reducing mean time to repair (MTTR) and improving operator safety.

At the execution and motor control layer, the MT08N1 protects the incoming supply to Altivar Process ATV600 or ATV900 variable speed drives and TeSys D or TeSys Giga motor starters. Coordinated protection between the ACB and downstream drive input fuses or MCCBs ensures that drive faults do not cascade into main bus disturbances, preserving system uptime across multi-motor process lines.

At the redundancy and maintenance layer, the MT08N1 supports bus-tie configurations in double-busbar switchgear, enabling N+1 redundancy for critical feeders. Combined with Masterpact MTZ series breakers on the incoming section, a fully redundant LV distribution architecture can be achieved — one that supports predictive maintenance through continuous insulation monitoring (CIM) modules and arc flash detection relays integrated into the same panel assembly.

Manufacturing & Automotive Assembly: In body-in-white (BIW) welding lines and paint shop facilities, the MT08N1 serves as the main incomer for MCC sections supplying robot controllers, servo drives, and conveyor systems. Its high breaking capacity and selective coordination with downstream MCCBs ensure that a welding gun short-circuit does not interrupt the entire production line. The drawout mechanism allows scheduled maintenance during planned shutdowns without requiring full panel isolation.

Power Generation & Utilities: In combined heat and power (CHP) plants and grid-connected renewable energy substations, the MT08N1 is deployed as a generator circuit breaker or bus-tie breaker in the LV distribution board. Its IEC 61850 communication capability enables integration with substation automation systems (SAS), supporting GOOSE messaging for fast bus protection and automatic reconfiguration following a feeder fault.

Petrochemical & Refinery: In hazardous area electrical rooms (Zone 2 classified), the MT08N1 is installed in pressurised or purged switchgear enclosures feeding Ex-rated motor starters and process heaters. The Micrologic trip unit's ground fault protection (Ig) is essential for detecting insulation degradation in long cable runs to remote field equipment, preventing catastrophic failures in flammable atmosphere environments.

Water Treatment & Pumping Stations: Municipal water authorities deploy the MT08N1 as the main breaker for pump station MCCs controlling high-horsepower submersible and centrifugal pumps. Remote monitoring via Modbus RTU allows SCADA operators at a central control room to monitor breaker load current, trip history, and contact wear — enabling condition-based maintenance scheduling without dispatching field technicians to remote pump stations.

Mining & Mineral Processing: In underground mine electrical substations and surface concentrator plants, the MT08N1 protects high-current feeders to ball mills, crushers, and conveyor drives. Its robust mechanical design and high short-circuit withstand rating make it suitable for the high-impedance grounded distribution systems common in mining applications, where earth fault currents are intentionally limited to reduce arc flash energy.

Marine & Offshore: On offshore platforms and large vessels, the MT08N1 is type-approved for marine switchboard applications, providing main bus protection in compliance with classification society rules (DNV, Lloyd's Register, ABS). Its vibration resistance and wide operating temperature range ensure reliable performance in the harsh mechanical and thermal environment of engine rooms and topside electrical rooms.

Q1: Is the MT08N1 compatible with the newer Masterpact MTZ platform, and can it be upgraded in an existing switchgear assembly? The MT08N1 belongs to the Masterpact MT generation. While it is not directly interchangeable with the Masterpact MTZ (which uses a different mechanical frame and Micrologic X trip unit), Schneider Electric provides a documented upgrade path for existing Masterpact MT switchgear panels. The MTZ drawout chassis can be retrofitted into MT-rated compartments in many Okken and Prisma panel configurations, subject to a site-specific compatibility assessment. NANKMOS can supply both MT08N1 units for direct replacement and MTZ equivalents for upgrade projects, with full 12-Month Warranty coverage on all supplied units.

Q2: What communication protocols does the MT08N1 support, and how does it integrate into a Modicon PLC or EcoStruxure SCADA architecture? The MT08N1 with a Micrologic 5.0 or 6.0 trip unit supports Modbus RTU communication via the BCM (Breaker Communication Module) accessory. This allows the breaker to be polled by a Modicon M340 or M580 PLC over an RS-485 serial network, or via an Ethernet gateway (such as the EGX300 or EIFE module) for integration into EcoStruxure Power Monitoring Expert. For IEC 61850 integration in substation automation projects, the EIFE Ethernet interface module enables GOOSE and MMS communication directly from the breaker, without requiring an intermediate gateway. All communication accessories are available from NANKMOS stock with verified compatibility documentation.

Q3: What does the 12-Month Warranty cover, and what is the typical lead time for MT08N1 units from NANKMOS? All MT08N1 units supplied by NANKMOS carry a 12-Month Warranty covering manufacturing defects, trip unit calibration accuracy, and mechanical operation of the drawout mechanism. Each unit undergoes pre-shipment functional testing including contact resistance measurement, trip time verification at 3×Ir and 10×Ir, and communication module connectivity check. Standard in-stock units are dispatched within 3–5 business days. For project quantities or specific accessory configurations (shunt trip, undervoltage release, auxiliary contacts), lead times are confirmed at order placement. Contact NANKMOS at [email protected] or +86 18359268345 for availability and project pricing.