Schneider Electric NSX630N Replacement for Compact NSX

Product Overview

Schneider Electric NSX630N Replacement for Compact NSX: Seamless Transition & Legacy System Upgrade

When your existing Schneider Electric Compact NSX series circuit breaker reaches end-of-life, faces obsolescence, or requires emergency replacement, the NSX630N (630 A, 50 kA Icu at 415 V AC) delivers a fully compatible, drop-in upgrade path that minimises panel re-engineering and eliminates costly downtime. Engineered to the IEC 60947-2 standard, the NSX630N slots directly into existing Compact NSX mounting frames, retaining the same 3-pole or 4-pole footprint, identical busbar pitch, and compatible terminal lug positions as legacy NSX400N, NSX500N, and earlier-generation Compact NS630N installations.

Industrial facilities running legacy Schneider distribution boards — including Prisma P, Okken, or custom MCC (Motor Control Centre) enclosures — can retrofit the NSX630N without modifying existing DIN rail or fixed-mount chassis. The breaker’s Micrologic trip unit interface is backward-compatible with existing Modbus RTU communication wiring, allowing SCADA and BMS systems to continue polling protection data without reprogramming communication drivers. Where the legacy installation used a Compact NS630N with a separate Vigirex RH10M residual current relay, the NSX630N can be paired with a Vigi NSX add-on module to consolidate earth-fault protection into a single device, reducing panel depth requirements.

For sites migrating from older Merlin Gerin NS630N or Telemecanique-branded breakers, the NSX630N maintains the same 210 mm height profile and 105 mm depth, ensuring compatibility with existing cable management ducts and busbar risers. Existing 95 mm² to 300 mm² copper or aluminium supply cables can be re-terminated directly to the NSX630N’s standard lug terminals without re-pulling cable runs — a critical advantage in live panel upgrades where cable slack is limited.

Compatibility Comparison Table

Seamless Upgrade Solutions

A successful NSX630N retrofit rarely involves the breaker alone. In most Schneider Compact NSX panel upgrades, engineers simultaneously address adjacent components to future-proof the installation. The Micrologic 5.3 A trip unit is the most common companion upgrade, replacing worn or non-communicating Micrologic 2.3 units to add ammeter, voltmeter, and power metering functions without changing the breaker frame. Where the distribution board feeds variable-frequency drives or soft starters — such as the Altivar ATV630 or ATV320 series — the NSX630N’s adjustable Ir and Im settings allow precise coordination with downstream motor protection without requiring new relay settings across the entire protection cascade.

For panels that include legacy Compact NSX100F or NSX160F feeder breakers on sub-distribution boards, the NSX630N serves as the upstream incomer, maintaining selectivity across the full discrimination chain. Sites upgrading communication infrastructure from RS-485 Modbus RTU to Ethernet-based monitoring can add a IFE Ethernet interface module to the NSX630N, enabling integration with EcoStruxure Power Monitoring Expert without replacing the breaker itself.

In motor control centres where the NSX630N replaces a failed incomer, the associated NSX400N or NSX250F feeder breakers, TeSys D contactor assemblies, and LR9 thermal relay modules typically remain in service — the NSX630N’s protection coordination is pre-validated against these downstream devices in Schneider’s EcoDesign selectivity tables. For installations requiring residual current protection, the Vigi NSX 630 add-on module mounts directly to the NSX630N without additional panel space. Where power quality monitoring is required at the incomer, a PM5350 power meter can be wired to the NSX630N’s auxiliary contacts for real-time demand and harmonic data.

Retrofit Guidance FAQ

Q: Can I replace an NS630N (Merlin Gerin) with the NSX630N without modifying busbars?
A: Yes. The NSX630N shares the same busbar pitch and mounting hole pattern as the legacy Compact NS630N. Existing copper or aluminium busbars can be re-used directly.

Q: Will my existing Modbus RTU wiring work with the NSX630N’s Micrologic trip unit?
A: Yes, provided the replacement trip unit is a Micrologic 5.3 E or 6.3 E variant with the optional COM module. The RS-485 wiring, termination resistors, and Modbus address settings carry over without modification.

Q: Does the NSX630N fit in a withdrawable cradle designed for the NS630N?
A: The NSX630N withdrawable version uses the same cradle interface as the Compact NSX series. Legacy NS630N withdrawable cradles are not directly compatible — a new NSX withdrawable chassis is required for those installations.

Q: How do I coordinate the NSX630N with downstream NSX160F or NSX250F feeders?
A: Use Schneider’s Ecodial Advanced Calculation software or the published selectivity tables for the Compact NSX range. Total selectivity (T) is typically achieved between the NSX630N incomer and NSX250F feeders up to the full rated current.

Q: What is the physical installation space requirement for the NSX630N in a fixed-mount configuration?
A: The NSX630N fixed version requires a minimum panel depth of 200 mm and a height clearance of 250 mm including terminal covers. Withdrawable versions require additional depth per the cradle specification sheet.

Q: Can the NSX630N be used as a direct replacement in an Okken or Prisma P switchboard?
A: Yes. The NSX630N is listed as a compatible incomer for Prisma P and Okken MV/LV switchboards in Schneider’s panel builder documentation. Existing functional units and busbar adaptors are retained.

Warranty Assurance

Every NSX630N supplied by TOPNLMS is covered by a 12-month replacement warranty from the date of shipment. Prior to dispatch, each unit undergoes a multi-point outgoing inspection including insulation resistance verification, trip mechanism function test, and auxiliary contact continuity check. Units are packed in original or equivalent anti-static, shock-resistant packaging with full traceability documentation.

In the event of a confirmed defect within the warranty period, TOPNLMS provides a replacement unit or full refund — no return-to-manufacturer delays. Our technical support team responds to warranty and compatibility queries within 24 hours on business days. For urgent plant shutdowns requiring same-day dispatch, priority fulfilment is available for in-stock NSX630N units from our Xiamen warehouse.

Procurement teams can request a test report, packing list, and commercial invoice at the time of order. All export documentation for international shipments — including HS code classification, certificate of origin, and packing declaration — is prepared in-house to avoid customs clearance delays.