Schneider Acti9 C120N 125A Miniature Circuit Breaker

The C120N belongs to the Acti9 series high-current ミニチュアサーキットブレーカー (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. モデルの定義

C120: 製品シリーズ, high-current MCB (63～125A)

N: 遮断容量クラス, Icn=10kA @ 400V AC

125あ: Rated working current In=125A (reference temperature: 30℃)

Full model requires additional [極番号 + トリッピングカーブ]

Cカーブ: Instantaneous tripping at 5~10In, for general power distribution, lighting and resistive loads (部品番号. A9N18359 / A9N18363 / A9N18369)

Dカーブ: Instantaneous tripping at 10~14In, for loads with inrush current such as motors and transformers (部品番号. A9N18389)

2. コアの電気仕様

3. 配線仕様

Solid copper cable: マックス. 50mm²

Flexible copper cable: マックス. 35mm²

Optional aluminum terminal: For 16~50mm² aluminum cables

4. アプリケーションシナリオ
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

オプションのアクセサリ: Vigi C120 residual current module, 補助接点, fault alarm contact, シャントリリース

5. 選定ガイドライン & Alternative Products

選定メモ

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 (15の) / C120L (25の) for circuits with higher short-circuit current.

国内代替品

チント: NM1-125 compact MCCB / NB1-125 MCB

美味しい: CDB2 125 series miniature circuit breaker

6. よくあるトラブルシューティング
7. 閉店直後の旅行: Short circuit on downstream side, check cable insulation and load earth fault;
8. Trips after period of loaded operation: 過負荷, actual load exceeds 125A, or high ambient temperature causes derating;
9. 閉められない, 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)

シュナイダー Acti9 C120N 125A Product Manual (Compiled from Original Datasheet)

シリーズ: Acti9 C120N High-current Miniature Circuit Breaker (MCB)

定格電流: 125あ (reference at 30℃)

遮断容量: 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, 補助接点, alarm contacts and shunt releases.

規格: GB10963.1, IEC/EN60898-1, IEC/EN60947-2; CCC, CE認証済み

2. 電気仕様

3. 機械式 & 配線仕様
4. 取り付け: 35mm標準DINレール, snap-in type, mountable in any orientation
5. 保護クラス: IP20 (front terminals)
6. 配線容量

Solid copper cable: Max.50mm²

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

Optional aluminum terminals: For 16~50mm² aluminum cables

4. 締付トルク: 3.5 N・m
5. 全体の寸法 (18極あたり mm)

2P: 36幅mm; 3P: 54幅mm; 4P:72幅mm

6. 動作環境

周囲温度: -25℃～+70℃; derating required above 30℃

保管温度: -40℃～+85℃

高度: No derating ≤2000m; 2000m以上ではディレーティングが必要

相対湿度: 5~95%, 結露しないこと

4. トリップ特性
5. Thermal overload trip (逆時間)

1.13で: No tripping within 1h (冷たい状態)

1.45で: Tripping within 1h

2. 磁気瞬時トリップ

Cカーブ:5~10インチ, 配電, 点灯, 抵抗負荷

Dカーブ:10~14In, モーター, 変圧器, capacitor loads with inrush current

5. オプションのアクセサリ
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 / 過負荷
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. インストール & 操作上の注意
13. ディレーティング: Derate rated current when ambient temperature >30℃. 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. 配線: Top-in or bottom-in wiring is acceptable. Cable lugs are recommended. Tightening torque 3.5N·m to prevent overheating.
16. Model differentiation

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

7. トラブルシューティング
8. 閉店直後の旅行: 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. 閉められない, 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 & 取付寸法 (Original Datasheet)

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

取付レール: 35mm standard symmetrical DIN rail, snap-in installation

Common model: 3P C120N 125A (A9N18369): 81(W) × 81(H) ×73(D) mm

Related Mounting Dimensions

1. Cable stripping length: 15 mm
2. 端子締め付けトルク: 3.5 N・m
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)

補足事項

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