Schneider Electric Compact NSX250N 250A MCCB

Overview

The Schneider Electric NSX250N (Compact NSX250N) is a 3-pole molded case circuit breaker (MCCB) rated at 250A, built on the same ComPact NSX platform as its smaller siblings but equipped with a Micrologic 2.2 electronic trip unit rather than a simple thermal-magnetic mechanism. This gives specifying engineers adjustable long-time and short-time protection settings alongside a fixed instantaneous trip, allowing far more precise coordination in multi-tier distribution systems than a standard TMD device can offer. With a breaking capacity (Icu) of 50kA rms at 415VAC and full IEC 60947-2 compliance, the NSX250N is a standard specification for main distribution boards, motor control centers, and sub-metering panels where selective discrimination between upstream and downstream devices is a design requirement.

As the official authorized partner and exclusive regional representative for Schneider Electric, Seven Star LLC proudly supplies the Schneider Electric Compact NSX250N to consulting engineers, panel builders, and EPC contractors throughout the Sultanate of Oman and the wider GCC. Buyers in Muscat, Sohar, and Salalah benefit from genuine manufacturer stock, verified breaking-capacity and trip-unit documentation, and local commissioning support — essentials for any protection device feeding into a facility’s formal selectivity study.

Operating Principle of the Schneider Electric NSX250N

The Schneider Electric Compact NSX250N uses its Micrologic 2.2 electronic trip unit to continuously monitor current on each phase through internal current transformers, digitally comparing the measured values against user-configured long-time (overload) and short-time (short-circuit) protection curves. The long-time protection setting is adjustable to match the actual current rating of downstream cabling, while the short-time delay can be tuned to allow an upstream breaker to remain closed during a fault that a downstream device is expected to clear first — the foundation of a selective, or discriminative, protection scheme. A fixed instantaneous trip stage remains active as a final safety backstop regardless of the programmed settings, ensuring the breaker still responds immediately to a severe short circuit.

Because trip decisions are computed electronically rather than through a fixed bimetallic-and-magnetic mechanism, the Micrologic 2.2 unit delivers tighter tripping tolerances and repeatable performance across ambient temperature swings, which matters in the high-heat electrical rooms common across Oman’s industrial sites. The practical consequence for facility operators is fewer nuisance trips, easier compliance with a formal arc-flash or selectivity study, and clear on-device indication of the cause of any trip event, reducing troubleshooting time during a fault investigation.

Engineering Design of the Schneider Electric Compact NSX250N

The Schneider Electric Compact NSX250N shares the compact molded case architecture of the wider ComPact NSX <630A range, with the 3-pole version measuring approximately 105mm x 161mm x 86mm, allowing the breaker to occupy the same panel footprint as lower-current variants despite its more sophisticated trip electronics. The case is manufactured from high-impact, flame-retardant insulating material, and the breaker is offered in fixed, plug-in, and withdrawable mounting configurations to match different panel architectures and maintenance strategies. The Micrologic 2.2 module is front-mounted and field-configurable via a sealed rotary dial interface, allowing commissioning engineers to set thermal and short-time protection thresholds without opening the breaker body.

Rated for an insulation voltage of 800V AC and an operational voltage of 690V AC at 50/60Hz, the NSX250N accepts the same accessory ecosystem as the rest of the ComPact NSX family — auxiliary and fault-signaling contacts, shunt trips, undervoltage releases, and communication modules where remote monitoring is required. This shared accessory platform simplifies spares provisioning for panel builders who standardize on the ComPact NSX range across a project.

Key Features

The Schneider Electric NSX250N combines electronic protection precision for buyers searching for a Schneider Electric NSX250N with the mechanical robustness expected of an industrial MCCB. Its principal characteristics include:

• Rated current of 250A across 3 poles, suited to main and sub-distribution feeder protection.
• Micrologic 2.2 electronic trip unit with adjustable long-time and short-time protection plus a fixed instantaneous stage.
• Breaking capacity (Icu) of 50kA rms at 415VAC 50/60Hz for robust short-circuit interruption.
• Field-adjustable protection settings support formal selectivity and discrimination studies.
• Rated insulation voltage of 800V AC and operational voltage of 690V AC 50/60Hz.
• Compact molded case footprint of approximately 105 x 161 x 86mm despite the added electronics.
• Compliant with IEC 60947-2 and compatible with the full ComPact NSX accessory and communication ecosystem.
• Available in fixed, plug-in, and withdrawable mounting formats for new build or retrofit projects.

Industrial Applications

The Schneider Electric Compact NSX250N is specified in facilities where protection coordination between multiple breaker tiers is a formal design requirement: main low-voltage switchboards, motor control centers, generator changeover panels, and sub-distribution boards feeding large HVAC chillers or process equipment. Across Oman’s district cooling plants, commercial and hospitality tower risers in Muscat, and RO desalination and pharmaceutical facilities, the NSX250N’s electronic trip unit allows engineers to tune protection settings to the actual installed load, reducing nuisance tripping while maintaining full short-circuit protection.

As the officially authorized partner for Schneider Electric, Seven Star LLC distributes the NSX250N to contractors and panel integrators serving the Sohar and Salalah economic zones, where growing industrial and logistics infrastructure increasingly requires selectively coordinated protection schemes rather than simple fixed-trip breakers. Our authorized regional stock and technical support ensure that consulting engineers and EPC contractors across Oman and the GCC can specify the NSX250N with confidence in delivery timelines, genuine Micrologic firmware, and after-sales support for commissioning and settings verification.

Technical Specifications

The table below summarizes the key technical parameters of the Schneider Electric NSX250N for specification and procurement purposes.

Call To Action

Seven Star LLC supports formal RFQ submissions, technical datasheet requests, and regional warehouse stock checks for the Schneider Electric NSX250N across Oman and the GCC. As the authorized partner for Schneider Electric in Oman and the GCC, our low-voltage distribution division can advise on Micrologic trip settings, selectivity coordination, and accessory compatibility for your project. Contact Seven Star LLC today to request a formal quotation, download the technical datasheet, or speak with our engineering team about deploying the NSX250N in your next panel build or upgrade in Muscat, Sohar, Salalah, or anywhere across the Sultanate of Oman.