Schneider Electric NSX100N Molded Case Circuit Breaker – Compact NSX Series

Schneider Electric NSX100N — 100 A Fixed MCCB in Industrial Power Distribution Architecture

The NSX100N is a 100 A, 3-pole fixed molded case circuit breaker (MCCB) within Schneider Electric’s Compact NSX series, engineered for industrial power distribution networks where prospective short-circuit currents reach up to 50 kA at 415 V AC. Unlike general-purpose breakers, the NSX100N is built around a thermomagnetic trip unit with independently calibrated bimetallic elements per pole, ensuring consistent overload response across asymmetric load conditions. Its fixed-mount chassis integrates directly with standard 60 mm pitch busbars, eliminating the mechanical variability introduced by plug-in or withdrawable configurations in high-vibration environments such as motor control centers (MCCs) and compressor drive panels.

In a typical radial distribution topology, the NSX100N occupies the feeder-breaker position downstream of a main incomer, protecting cable runs and sub-distribution boards serving loads up to 45 kW at 400 V. Its 50 kA symmetrical breaking capacity (Icu) at 415 V — with a service breaking capacity (Ics) rated at 100% Icu — means no derating is required even in installations with high available fault energy, a critical distinction from competing 36 kA-class devices that must be derated to 75% Ics in practice.

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Technical Parameters

Hardware Logical Analysis

The NSX100N’s thermomagnetic trip unit employs a dual-element architecture: a bimetallic strip for thermal (overload) detection and a magnetic solenoid for instantaneous short-circuit response. Each pole contains an independent bimetallic element, which means the breaker responds to single-phase overloads without requiring all three phases to reach the trip threshold simultaneously — a design advantage in unbalanced three-phase motor circuits where single-phase heating is the dominant failure mode.

The magnetic solenoid is factory-set at a fixed 10 × In threshold (1,000 A for the 100 A frame), providing deterministic instantaneous tripping for bolted fault conditions. This fixed threshold eliminates the field-adjustment risk present in adjustable magnetic trip units, where incorrect settings can leave downstream cables unprotected during high-impedance faults.

From an EMC perspective, the NSX100N’s arc-quenching chamber uses a deionization grid with steel arc splitter plates arranged at a calculated pitch to maximize arc voltage and accelerate current-zero crossing. This design limits the let-through energy (I²t) to values well within the withstand ratings of standard 70 mm² copper cable at 100 A, protecting insulation from thermal damage during fault clearance. The fixed chassis construction eliminates the contact resistance variability of plug-in systems, maintaining stable milliohm-level contact resistance across the product’s 25,000-cycle mechanical life.

The NSX100N’s housing is constructed from glass-fiber-reinforced polyamide (PA66-GF30), providing a comparative tracking index (CTI) of ≥ 600 V and a glow-wire ignition temperature (GWIT) of 775 °C — both critical for compliance with IEC 60695-2-13 in enclosed panel environments where arc flash and thermal runaway are design constraints.

System Integration Benefits

• Deterministic fault clearance: Fixed 10 × In magnetic threshold ensures sub-10 ms instantaneous tripping on bolted faults, maintaining upstream selectivity margins in cascaded protection schemes without requiring time-delay coordination.
• 100% Ics rating eliminates derating: Unlike 36 kA-class breakers derated to 75% Ics, the NSX100N operates at full 50 kA service capacity, allowing engineers to design to the nameplate without applying safety margins that would otherwise require a larger frame.
• Accessory modularity for diagnostic transparency: The NSX100N accepts OF (auxiliary contact), SD (fault signal contact), and SDE (earth fault signal) add-on modules without frame modification, enabling real-time status feedback to SCADA or PLC digital inputs without additional current transformers.
• Motor operator compatibility: Optional motorized operating mechanism (MOE) converts the NSX100N to a remotely controlled switching device, supporting automatic reclosing sequences in generator transfer and load-shedding applications.
• Voltage release integration: MN (undervoltage) and MX (shunt trip) releases can be field-installed, enabling integration with fire suppression systems, emergency stop circuits, and UPS bypass logic without panel rewiring.
• Busbar system compatibility: Direct bolt-on connection to Schneider Linergy and standard 60 mm pitch copper busbars reduces installation labor and eliminates the impedance discontinuity introduced by cable-lug terminations in high-current distribution boards.
• Selective coordination with upstream devices: The NSX100N’s time-current characteristic (TCC) is published in Schneider’s Ecodial selectivity tables, enabling engineers to verify discrimination margins against upstream NSX250 or Masterpact NW devices without iterative simulation.
• Pollution degree 3 rating: Qualified for operation in environments with conductive pollution (condensation, dust), covering outdoor enclosures, coastal industrial sites, and food-processing facilities without requiring additional sealing measures.

Quality Assurance & Global Logistics

Every NSX100N unit supplied through siemensplc.com is sourced from verified Schneider Electric authorized distribution channels. Each unit undergoes incoming inspection covering label authenticity verification against Schneider’s product traceability database, packaging integrity assessment, and serial number cross-referencing. Certificates of conformity (CoC) and factory test reports are available upon request for project documentation and third-party audit purposes.

Units are stored in a climate-controlled warehouse in Xiamen, China, maintained at 18–25 °C with relative humidity below 60% RH, consistent with IEC 60068-1 storage condition class 1K3. Outbound shipments are packed in anti-static polyethylene foam with moisture-barrier outer cartons, rated for ISTA 2A transit testing. Standard export documentation — commercial invoice, packing list, and certificate of origin — is prepared for all international shipments.

Logistics options from Xiamen include DHL Express (3–5 business days to Europe/North America), FedEx International Priority, sea freight LCL/FCL for bulk orders, and China Post EMS for cost-sensitive destinations. Expedited same-day dispatch is available for orders confirmed before 14:00 CST. All shipments are covered by a 12-month warranty from the date of shipment, with replacement or credit issued for confirmed manufacturing defects.

Contact Information

Email: [email protected]
WhatsApp: +86 18359268345
Web: siemensplc.com
Location: Xiamen, China
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