Schneider MT40N1 Air Circuit Breaker – Obsolete Compact NS Series Spare Part

Technical Dossier

Product Details And Specifications

Schneider MT40N1 Air Circuit Breaker – Obsolete Compact NS Series Spare Part

RFQ support for obsolete parts: Send the model number, required quantity and destination so DriveKNMS can confirm sourcing options before quotation.

Technical Specifications

Solving the Discontinued Hardware Crisis

The Schneider Compact NS and Masterpact MT product lines anchored industrial power distribution across manufacturing, utilities, and process industries for decades. Facilities that standardized on these platforms in the 1990s and 2000s built their entire electrical infrastructure around the mechanical and electrical interface of these breakers. The MT40N1 sits at a critical node in that infrastructure — typically serving as a main incomer or high-current feeder breaker in panels where the bus bar geometry, draw-out cradle dimensions, and trip unit communication protocols are all matched to this specific frame.

Schneider's transition to the newer Masterpact MTZ platform introduced incompatible mechanical footprints and digital trip unit architectures. A direct swap is not possible without modifying the switchboard structure, reconfiguring protection relay settings, and in many cases, re-certifying the entire panel under current electrical codes. For a plant running 24/7 operations, that process takes months and costs far more than the capital value of the breaker itself.

Condition & Reliability Assurance

Obsolete parts sourced outside the OEM channel carry real risk if the inspection process is inadequate. DriveKNMS applies a five-stage quality protocol to every unit before it is offered for sale:

• Stage 1 – Visual and Mechanical Inspection: Full external examination for housing cracks, arc damage, contact erosion, and mechanical wear on the draw-out mechanism and racking assembly.
• Stage 2 – Electrolytic Capacitor Assessment: Internal inspection of the trip unit electronics for capacitor bulging, electrolyte leakage, and ESR degradation — the primary failure mode in aged electronic trip units.
• Stage 3 – Firmware and Trip Unit Verification: Where applicable, the trip unit firmware version is confirmed and logged. Units with corrupted or mismatched firmware are quarantined.
• Stage 4 – Contact and Pin Corrosion Check: All primary and secondary disconnect contacts are inspected under magnification for oxidation, pitting, and plating loss. Affected contacts are cleaned or the unit is rejected.
• Stage 5 – Functional Test Record: Each unit's test history and condition grade (New, Refurbished-Grade A, or Tested-Used) is documented and provided with the shipment.

Condition grade and any observed wear are disclosed in full before order confirmation. There are no surprises after delivery.

Key Features for System Maintenance

How do I know the unit is genuine and not counterfeit?
Every unit is physically inspected against known-genuine reference units. Schneider Electric nameplate markings, serial number formats, and internal construction are verified. Units that fail authentication are rejected and not offered for sale.

Can you source other Compact NS or Masterpact MT variants?
Yes. DriveKNMS specializes in the full Schneider legacy breaker range. Contact us with your full part number and required quantity.