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This is a Schneider Electric ComPacT NSX series molded case circuit breaker (MCCB) for power distribution protection.
New standard order number: C25N3TM160
Obsolete old order number: LV431832
Compliant with IEC 60947‑2 and GB/T 14048.2 standards.
- Basic Rated Core Parameters
| Item | Value |
| Type | Low‑voltage MCCB for power distribution protection |
| Frame rating | 250A |
| Poles | 3P (3 poles, all protected) |
| Rated current In | 160A (continuous at 40℃) |
| Rated operational voltage Ue | 690V AC 50/60Hz, suitable for 380V/400V/415V systems |
| Rated insulation voltage Ui | 800V AC |
| Rated impulse withstand voltage Uimp | 8kV |
| Frequency | 50/60Hz |
| Utilization category | Type A (no short‑time delay, general distribution) |
| Isolation function | Certified isolating function per IEC 60947‑2 |
- Short‑Circuit Breaking Capacity
| System Voltage | Rated ultimate shortircuit breaking capacity Icu | Rated service shortircuit breaking capacity Ics |
| 415V AC | 50kA | 50kA (100% Icu, reusable after breaking) |
| 500V AC | 36kA | 36kA |
| 690V AC | 10kA | 10kA |
Rated short‑time withstand current Icw (1s): 12kA at 415V AC
- TMD Thermal‑Magnetic Release Characteristics
Standard TMD thermal‑magnetic release, LI protection (long‑time overload + instantaneous short‑circuit).
- Long‑time overload thermal protection
Ir setting range: 0.7–1×In (112A–160A)
Characteristic: 120–400s at 1.5×Ir; ≤15s at 6×Ir (standard inverse time)
- Short‑circuit instantaneous magnetic protection
Instantaneous current Ii: fixed at 1250A
Operating time: ≤20ms
- Mechanical & Installation Parameters
| Item | Value |
| Dimensions (W×H×D) | 105mm × 161mm × 86mm |
| Standard mounting centers | Vertical 125mm × Horizontal 35mm |
| Mounting | Fixed, front connected; horizontal/vertical, no derating |
| Wiring capacity | Up to 70mm² copper cable / busbar |
| Mechanical endurance | 20,000 operations |
| Electrical endurance | 10,000 operations at 440V AC, In |
| Ingress protection | IP40 (body), IP54 (panel‑mounted) |
| Impact resistance | IK07 |
| Net weight | Approx. 2.4kg |
- Environmental & Compliance Parameters
Ambient temperature: -25℃ ~ +70℃; no derating below 40℃
Altitude: 0–2000m without derating
Pollution degree: 3
Overvoltage category: II
Certifications: CCC, CE, EAC, Marine, etc.
Accessory slots: 5 standard slots for auxiliary, alarm, shunt, undervoltage release, etc.
- Expansion & Compatibility
Can be fitted with Vigi earth‑leakage modules
Compatible with motor operators for remote control
Can add interlock, position indicator, padlock devices
Top/bottom feed both allowed without performance derating
Replacement & Selection Notes
- Old type LV431832 is discontinued; use C25N3TM160 instead.
- For electronic release (adjustable short delay / earth fault), upgrade to NSX250N with MicroLogic (2.2/5.0).
- Breaking ratings: H (70kA), S (100kA), based on short‑circuit calculation.
- Competitors: ABB Tmax T2, Siemens 3VT250, suitable for cross‑brand replacement.
NSX250N‑3P‑160A Direct Replacement Solutions
Core Matching Rules (100% match required)
Frame rating: 250A (do NOT downgrade to 160A frame)
Poles: 3P
Rated current: 160A
Breaking capacity: ≥50kA at 415V AC
Release type: thermal‑magnetic (LI characteristic)
Mounting: fixed front connection, matching panel holes
- Recommended Replacements
Scenario 1: Import Brand Direct Replacement
ABB Tmax XT3N250 TMD160/1600 FF 3P
Order No.: 1SDA068266R1
Match: 100%
Frame 250A, 3P, 160A, TMG thermal‑magnetic
Icu=50kA, Ics=50kA at 415V AC
Identical dimensions and mounting holes
Full accessory compatibility
Application: foreign‑funded plants, export equipment, on‑site repair
Siemens 3VC250N TMA160 3P
Order No.: 3VC2316‑2DA33‑0AA0
Match: 98%
Frame 250A, 3P, 160A, TMA thermal‑magnetic
50kA at 415V AC
Highly compatible dimensions
Application: Siemens low‑voltage systems
Scenario 2: Domestic High‑Cost‑Performance Replacement
Changshu Switch CM3‑250H/3300 160A
Match: 99%
Frame 250A, 3P, 160A, distribution type thermal‑magnetic
Icu=50kA at 415V AC
Compliant with IEC 60947‑2 / GB 14048.2
Application: industrial, building distribution, domestic projects
Chint NM8‑250N/3P 160A
Match: 95%
Frame 250A, 3P, 160A, thermal‑magnetic
50kA at 415V AC
Application: civil construction, general distribution
- Dimensions & Parameters Comparison
| Model | Dimensions (W×H×D) | Mounting Centers | Icu (415V) | Release | Frame |
| NSX250N‑3P‑160A | 105×161×86mm | 125mm×35mm | 50kA | TMD | 250A |
| ABB XT3N250 3P 160A | 105×161×86mm | 125mm×35mm | 50kA | TMG | 250A |
| Siemens 3VC250N 3P 160A | 105×160×85mm | 125mm×35mm | 50kA | TMA | 250A |
| CM3‑250H 3P 160A | 108×162×86mm | 125mm×35mm | 50kA | Thermal‑magnetic | 250A |
> Note: ABB XT3N250 matches dimensions and holes 100% – best direct replacement.
- Safety Rules for Replacement
- No frame downgrade: Do NOT use 160A frame breakers (e.g., ABB T2N, NSX160).
- Breaking capacity ≥50kA: Do NOT use 36kA / 25kA models.
- Release matching: Use distribution‑type thermal‑magnetic only.
- Accessory compatibility: Match auxiliary, shunt, undervoltage, earth‑leakage modules.
- Final Selection Guide
Direct replacement, import, no cabinet modification: ABB XT3N250 TMD160/1600 FF 3P
New project, domestic approval, cost‑effective: Changshu CM3‑250H/3300 160A
Siemens system replacement: Siemens 3VC250N TMA160 3P
