Schneider Acti9 C120N 125A Miniature Circuit Breaker

The C120N belongs to the Acti9 series high-current قاطع الدائرة المصغرة (MCB). It is an upgraded high-current variant of the standard C65N, with a maximum rated current of 125A and isolation function. Widely used for power distribution in industrial and building terminals, as well as outgoing circuits in power cabinets.

1. تعريف النموذج

C120: سلسلة المنتجات, high-current MCB (63~125A)

ن: كسر فئة القدرة, Icn=10kA @ 400V AC

125أ: Rated working current In=125A (reference temperature: 30درجه مئوية)

Full model requires additional [رقم القطب + منحنى التعثر]

منحنى C: Instantaneous tripping at 5~10In, for general power distribution, lighting and resistive loads (رقم الجزء. A9N18359 / A9N18363 / A9N18369)

منحنى D: Instantaneous tripping at 10~14In, for loads with inrush current such as motors and transformers (رقم الجزء. A9N18389)

2. المواصفات الكهربائية الأساسية

3. مواصفات الأسلاك

Solid copper cable: الأعلى. 50مم²

Flexible copper cable: الأعلى. 35مم²

Optional aluminum terminal: For 16~50mm² aluminum cables

4. سيناريوهات التطبيق
5. High-current outgoing circuits in factory buildings, computer rooms and building distribution cabinets
6. Main power incoming, fan and water pump circuits (D-curve recommended)
7. Alternative to small-frame moulded case circuit breakers to save cabinet space

الملحقات الاختيارية: Vigi C120 residual current module, اتصال مساعد, fault alarm contact, الافراج عن تحويلة

5. إرشادات الاختيار & Alternative Products

ملاحظات الاختيار

1. Derating is required when ambient temperature exceeds 30℃;
2. D-curve is preferred for motor loads; C-curve for general distribution;
3. C120N with 10kA breaking capacity; select C120H (15ال) / C120L (25ال) for circuits with higher short-circuit current.

البدائل المحلية

شينت: NM1-125 compact MCCB / NB1-125 MCB

لذيذ: CDB2 125 series miniature circuit breaker

6. استكشاف الأخطاء وإصلاحها الشائعة
7. الرحلات مباشرة بعد الإغلاق: Short circuit on downstream side, check cable insulation and load earth fault;
8. Trips after period of loaded operation: الزائد, actual load exceeds 125A, or high ambient temperature causes derating;
9. لا يمكن إغلاقه, handle stuck: Damaged internal mechanism, or Vigi residual current module triggered;
10. Green indicator does not appear: Main contacts are not fully disconnected. Maintenance on downstream circuits is prohibited.
11. HS Code Reference

85362000 Low-voltage circuit breaker (for customs declaration reference only, subject to customs verification)

شنايدر Acti9 C120N 125A Product Manual (Compiled from Original Datasheet)

مسلسل: Acti9 C120N High-current Miniature Circuit Breaker (MCB)

التصنيف الحالي: 125أ (reference at 30℃)

كسر القدرة: Icn=10kA @400V AC

Reference part numbers:

2P C-curve: A9N18363

3P C-curve: A9N18369

4P C-curve: A9N18376

3P D-curve: A9N18389

The C120N is part of Schneider Acti9 high-current MCB family covering 63~125A. It features isolation function. The green contact indicator provides direct visual confirmation that main contacts are open, meeting maintenance safety requirements. It provides thermal-magnetic protection against overload and short-circuit for high-current power distribution in industrial and building distribution cabinets. Compatible with add-on accessories including Vigi C120 residual current module, اتصالات مساعدة, alarm contacts and shunt releases.

المعايير: GB10963.1, IEC/EN60898-1, IEC/EN60947-2; سي سي سي, شهادة CE

2. المواصفات الكهربائية

3. ميكانيكية & مواصفات الأسلاك
4. تصاعد: 35مم السكك الحديدية DIN القياسية, snap-in type, mountable in any orientation
5. فئة الحماية: IP20 (front terminals)
6. قدرة الأسلاك

Solid copper cable: Max.50mm²

Flexible copper cable (with cable lug): Max.35mm²

Optional aluminum terminals: For 16~50mm² aluminum cables

4. تشديد عزم الدوران: 3.5 ن · م
5. الأبعاد الشاملة (18ملم لكل قطب)

2ص: 36عرض ملم; 3ص: 54عرض ملم; 4ص:72عرض ملم

6. بيئة التشغيل

درجة الحرارة المحيطة: -25درجه مئوية ~ +70 درجه مئوية; derating required above 30℃

درجة حرارة التخزين: -40درجه مئوية ~ +85 درجه مئوية

ارتفاع: No derating ≤2000m; التخفيض مطلوب فوق 2000 متر

الرطوبة النسبية: 5~95%, غير التكثيف

4. خصائص التعثر
5. رحلة الزائد الحراري (الوقت العكسي)

1.13في: No tripping within 1h (cold state)

1.45في: Tripping within 1h

2. رحلة مغناطيسية لحظية

منحنى C:5~10 بوصة, توزيع الطاقة, إضاءة, الأحمال المقاومة

منحنى D:10~14In, المحركات, محولات, capacitor loads with inrush current

5. الملحقات الاختيارية
6. Vigi C120: Add-on residual current protection module, forms RCD+MCB combination
7. OF Auxiliary contact: Circuit ON/OFF status signal
8. SD Fault alarm contact: Tripping signal for short-circuit / الزائد
9. MX Shunt release: Remote electrical trip
10. MN Undervoltage release: Loss-of-voltage protection
11. Busbar: Comb-type busbar for multi-pole parallel incoming connection
12. تثبيت & ملاحظات العملية
13. Derating: Derate rated current when ambient temperature >30درجه مئوية. Derating also required for multiple devices installed side by side inside enclosed cabinets.
14. Isolation verification: When handle is set to OFF position, the green indicator visible confirms main contacts are fully open before downstream maintenance. Handle position alone cannot be used as isolation confirmation.
15. الأسلاك: Top-in or bottom-in wiring is acceptable. Cable lugs are recommended. Tightening torque 3.5N·m to prevent overheating.
16. Model differentiation

C120N:10ال; C120H:15ال; C120L:25ال. Select H/L version for circuits with high short-circuit current.

7. استكشاف الأخطاء وإصلاحها
8. الرحلات مباشرة بعد الإغلاق: Short circuit or earth fault on downstream side. Test breaker separately after disconnecting load to verify breaker integrity.
9. Trips after loaded operation: Actual load exceeds rated current, or high ambient temperature causes derating.
10. لا يمكن إغلاقه, handle stuck: Damaged mechanism or locked residual current module.
11. Overheating when closed: Insufficient terminal torque, undersized cable, oxidized terminals.
12. Model Selection Table (C120N 125A)

Schneider Acti9 C120N 125A Overall & أبعاد التركيب (Original Datasheet)

مرجع: Height H=81mm, Depth D=73mm, height and depth are consistent for all pole types; width varies with pole count

تصاعد السكك الحديدية: 35mm standard symmetrical DIN rail, snap-in installation

Common model: 3P C120N 125A (A9N18369): 81(دبليو) × 81(ح) ×73(د) مم

Related Mounting Dimensions

1. طول تجريد الكابل: 15 مم
2. عزم الدوران الطرفي: 3.5 ن · م
3. Max terminal wiring: Solid wire 50mm² / Flexible wire 35mm²
4. Cabinet clearance: ≥20mm wiring space reserved at top and bottom terminals; keep heat dissipation gap for side-by-side installation at high temperature (derating)

ملاحظات تكميلية

Depth 73mm: Total depth from DIN rail backplate to front handle of breaker body; cabinet door cutout needs clearance allowance

Height 81mm: Overall vertical height of device body, excluding cable bending allowance

If Vigi C120 residual current module is fitted, overall depth increases, refer to separate accessory datasheet for dimension