Schneider Electric Compact NSX Series Circuit Breakers: NSX100N

Technical Dossier

Product Details And Specifications

Schneider Electric Compact NSX Series Technical Notes

The Schneider Electric Compact NSX series is one of the most widely deployed low-voltage molded case circuit breaker (MCCB) platforms in global heavy industry. Installed across petrochemical complexes, nuclear power auxiliary systems, offshore platforms, and large-scale refinery distribution boards, the NSX range covers rated currents from 16 A to 630 A in a standardized frame architecture. Its modular design — supporting fixed, withdrawable, and toggle configurations — has made it the reference standard for panel builders and EPC contractors operating under IEC 60947-2.

The series is segmented by frame size: NSX100 (up to 100 A), NSX160/250 (up to 250 A), NSX400/630 (up to 630 A). Each frame accommodates interchangeable trip units (TM-D thermomagnetic, Micrologic electronic), enabling a single mechanical body to serve diverse protection curves without chassis replacement. This architecture is critical for facilities managing long-term spare parts standardization.

The Evolution of Compact NSX Architecture

The Compact NSX platform succeeded the legacy Compact NS series (introduced in the 1990s), inheriting its IEC frame dimensions while introducing a redesigned trip unit interface and improved arc-chute geometry. The transition from NS to NSX was phased between 2005 and 2012, with NSX achieving full IEC 60947-2 Edition 3 compliance and UL 489 listing for North American variants.

Early NSX units shipped exclusively with TM-D thermomagnetic trip units (fixed thermal and magnetic thresholds). From approximately 2008, Schneider introduced the Micrologic electronic trip unit family (2.0, 5.0, 6.0, 7.0), enabling adjustable long-time, short-time, instantaneous, and ground-fault protection on the same frame. This created a compatibility split: older panel designs specifying TM-D units cannot directly substitute Micrologic variants without relay coordination review.

The NSX100 frame (the subject of NSX100N) covers breaking capacities of 25 kA (N-class), 36 kA (H-class), 50 kA (S-class), and 70 kA (L-class) at 415 V AC, allowing specifiers to select the appropriate interrupting rating for their fault-level study without changing the physical footprint. Withdrawable versions (NSX100NA, NSX100HA) introduced cradle-mounted isolation for MCC applications, a feature absent in the original NS100 generation.

Compact NSX Full Catalog & Functionalities (SKU List)

The following SKUs represent verified, commonly stocked models within the Compact NSX platform. Units are classified by frame, breaking capacity, and trip unit type.

NSX100 Frame — Fixed (3P) Circuit Breakers

• NSX100N: 100 A, 3P, 25 kA @ 415 V, TM-D thermomagnetic trip, fixed mount, IEC 60947-2
• NSX100H: 100 A, 3P, 36 kA @ 415 V, TM-D thermomagnetic trip, fixed mount, high breaking capacity
• NSX100S: 100 A, 3P, 50 kA @ 415 V, TM-D thermomagnetic trip, fixed mount, very high breaking capacity
• NSX100L: 100 A, 3P, 70 kA @ 415 V, TM-D thermomagnetic trip, fixed mount, ultra-high breaking capacity
• NSX100F: 100 A, 3P, 36 kA @ 415 V, TM-D trip, fixed, UL 489 listed North American variant

NSX100 Frame — Withdrawable Circuit Breakers

• NSX100NA: 100 A, 3P, 25 kA, withdrawable (cradle mount), TM-D trip, MCC applications
• NSX100HA: 100 A, 3P, 36 kA, withdrawable, TM-D trip, high breaking capacity MCC variant

NSX100 Frame — Electronic Trip Unit (Micrologic)

• NSX100N Micrologic 2.0: 100 A, 3P, 25 kA, adjustable long-time and instantaneous protection
• NSX100H Micrologic 5.0: 100 A, 3P, 36 kA, LSI protection (long-time, short-time, instantaneous)
• NSX100H Micrologic 6.0: 100 A, 3P, 36 kA, LSIG protection with ground-fault function

NSX160/250 Frame

• NSX160N: 160 A, 3P, 25 kA @ 415 V, TM-D trip, fixed mount, standard breaking capacity
• NSX160H: 160 A, 3P, 36 kA @ 415 V, TM-D trip, fixed mount, high breaking capacity
• NSX250N: 250 A, 3P, 25 kA @ 415 V, TM-D trip, fixed mount, mid-frame standard variant
• NSX250H: 250 A, 3P, 36 kA @ 415 V, TM-D trip, fixed mount, mid-frame high breaking capacity

NSX400/630 Frame

• NSX400N: 400 A, 3P, 25 kA @ 415 V, Micrologic trip, fixed mount, large-frame standard variant
• NSX630N: 630 A, 3P, 25 kA @ 415 V, Micrologic trip, fixed mount, maximum-frame standard variant
• NSX630H: 630 A, 3P, 36 kA @ 415 V, Micrologic trip, fixed mount, large-frame high breaking capacity

Sourcing Hard-to-Find & Obsolete Compact NSX Parts

Common hard-to-find NSX variants we regularly source include: NSX100S, NSX100L, NSX100NA (withdrawable), NSX160H with Micrologic 5.0, and NSX250H. Contact our team with your full BOM for availability confirmation within 24 hours.

Quality Control for the Compact NSX Range

Each Compact NSX unit processed by DriveKNMS undergoes a structured inspection protocol aligned with IEC 60947-2 acceptance criteria: