Chint NXB125-3P100A 小型サーキットブレーカー

Chint NXB125-3P100A is a 3-pole ミニチュアサーキットブレーカー suitable for 400V AC power distribution systems. It is mainly used for overload protection, short-circuit protection and line isolation.

1. コア技術パラメータ
2. 基本仕様

極数: 3P (3極), suitable for three-phase four-wire or three-phase three-wire circuits.

定格電流: 100あ, with a frame rating current of 125A, which can meet the power distribution requirements of high-load scenarios.

トリップ特性: Divided into Type C (for conventional loads, electromagnetic tripping multiple: 8-12で) and Type D (for inductive loads such as motor starting, tripping multiple: 10-14で). The selection should be based on the actual load type.

遮断容量: 10の (rated ultimate short-circuit breaking capacity ICU), GB/Tに合わせて 14048.2 およびIEC 60947-2 標準, capable of handling sudden short-circuit faults.

定格電圧: 400Vと, 周波数 50Hz, compatible with industrial and civil power distribution systems.

2. 機械的および電気的寿命

– 機械的寿命: 20,000 オペレーション; 電気的寿命: 6,000 オペレーション (when In ≤ 100A), 長期間の使用でも高い安定性を確保.

– 全体の寸法: Approximately 81mm × 78.5mm × 80mm; 重さ: 0.6kg. It adopts 35mm standard DIN rail mounting, which saves space and facilitates maintenance.

3. 認証と規格

– It has obtained CCC and CE certifications, complies with international safety specifications, and is applicable to domestic and overseas engineering scenarios.

1. 典型的なアプリケーションシナリオ
2. 産業用配電

– Used for protection of motor control circuits and power incoming lines of production equipment. The Type D tripping characteristic can withstand the instantaneous inrush current during motor starting.

– 例えば, in small and medium-sized factories, it can be used as the main circuit breaker for 380V three-phase equipment (such as fans and water pumps).

2. Commercial and Civil Buildings

– Suitable for three-phase distribution boxes in office buildings, shopping malls and other places, used to protect branch circuits such as lighting and air conditioning.

– For household users with three-phase power supply access (such as villas or scenarios with concentrated high-power electrical appliances), it can be used as the main incoming line circuit breaker.

3. Temporary Power Supply and Construction

– In temporary distribution boxes at construction sites, it can prevent cable overheating caused by overload and improve electrical safety.

Ⅲ. 選択と設置に関する推奨事項

1. Selection Notes

ロードマッチング: Type C is suitable for resistive loads (such as heating equipment), and Type D is suitable for inductive loads (モーターなどの) to avoid false tripping.

環境条件: 使用温度範囲: -5℃～+40℃; 高度: ≤ 2000 メートル. It should not be used in humid or dusty environments.

2. インストールのポイント

– It is fixed using a TH35mm DIN rail. Ensure the rail is installed firmly and reserve heat dissipation space (with a spacing of ≥ 10mm).

– When wiring, tighten the terminal screws (トルク: 2.5N・m) to avoid heating caused by poor contact.

3. 価格と購入チャネル

– The market price is approximately 35 RMB ~ 132 単位あたり人民元. まとめ買いの場合 (例えば, より多い 10 単位), the price can be as low as 32 単位あたり人民元, which varies depending on the purchase channel and promotional activities.

1. User Reviews and Alternative Solutions
2. Practical Usage Feedback

– Most users comment that it has “solid hand feel and clear opening/closing operation”, and its price is more competitive than that of international brands such as Schneider and ABB, featuring outstanding cost-effectiveness.

– It should be noted that counterfeit products may exist in some channels. It is recommended to purchase through officially authorized distributors.

2. 代替モデルのリファレンス

Upgrade Option: 遮断能力が高い場合 (例えば, 15の) が必要です, Chint NXMN series molded case circuit breakers can be considered, which are compatible with 3P design and have higher short-circuit withstand capacity.

Economical Option: Delixi DZ47-125 series 3P 100A circuit breakers are slightly cheaper (について 28 単位あたり人民元) with a breaking capacity of 10kA, which can be used as alternatives.

1. Safety and Maintenance Tips
2. 定期点検

– Check whether the terminal blocks are loose every six months, and test the insulation resistance with an insulation resistance tester every year (the insulation resistance should be ≥ 1MΩ).

– サーキットブレーカーが頻繁に落ちる場合, check whether the load is overloaded or if there is a short-circuit fault in the line.

2. Fault Handling

– After tripping due to overload, wait for 1-2 minutes to allow the bimetallic strip to cool down before closing the circuit breaker.

– After tripping due to short-circuit, the fault point must be eliminated first to avoid secondary damage caused by direct closing.

In conclusion, Chint NXB125-3P100A has become a mainstream choice for three-phase power distribution scenarios due to its high cost-effectiveness, reliable performance and wide compatibility. It is recommended to select the product reasonably according to the actual load characteristics and installation environment, and purchase through formal channels to ensure product quality.