Schneider NT06H2 Air Circuit Breaker

NT: MasterPact NT series エアサーキットブレーカー (ACB, legacy model, 製造中止; replacement model MTZ1 06H2)

06: フレームサイズ 06, frame rated current 630A

H2: Breaking capacity class H2; Icu=50kA@440VAC, short-time withstand current Icw=50kA (1s), Class B selective protection

コアの電気パラメータ

重要なメモ

1. 生産中止状況: NT series scheduled for end-of-sale by the end of 2025. Replacement model MTZ1 06H2, part number LV947203 (draw-out version)
2. Parameter Clarification

Ue=690V: Maximum normal operating voltage

Ui=1000V: 電源周波数耐電圧

Uimp=12kV: 雷インパルス耐電圧. NOT applicable for 12kV high-voltage switchgear, this is an insulation index for low-voltage ACB

3. 応用: Incoming feeder, bus tie and heavy-load outgoing feeder in low-voltage distribution systems, for industrial plants, data centers and marine power distribution; supports selective protection and coordination with upstream/downstream devices
4. Reference Frame Part Numbers

NT06H2 3P Fixed: 47113

NT06H2 3P Draw-out: 47203

NT06H2 4P Fixed: 47119

付属品 & スペアパーツ

Trip Units: マイクロロジック 2.0 / 5.0 / 6.0 / 7.0 (過負荷, 短時間の遅延, instantaneous and earth-fault protection)

付属品: Motor operating mechanism, 補助接点, fault alarm contacts, closing coil, shunt trip coil, door interlock, phase barriers

Draw-out base: Mandatory independent cradle for draw-out version

トラブルシューティングのガイドライン

1. 閉じられない: Undervoltage coil de-energized, incomplete spring charging, cradle not in connected position, interlock blocking
2. Unintended tripping: Check trip unit protection curve, 地絡, harmonic distortion and temperature rise
3. 絶縁試験: Power frequency withstand test at Ui=1000V level; 12kV impulse withstand is type-test only, no on-site 12kV impulse test

Domestic Alternative Reference

Domestic MT06H2 (シュナイダー domestic MT series). Compatible breaking capacity and mounting dimensions for direct replacement.

Schneider MasterPact NT06H2 Air Circuit Breaker Technical Manual (Full Engineering Version, per original datasheet 0613CT0001)

備考: NT series is legacy discontinued ACB, frame size NT06, 入力=630A; breaking class H2; frame supplied without trip unit, MicroLogic trip unit to be ordered separately; standard IEC 60947-2, isolating function, Class B selective protection

Table of Contents

1. 製品概要 & 型式コードの説明
2. Rated Electrical Parameters
3. 機械的パラメータ, 全体の寸法 & 重さ
4. MicroLogic Trip Unit Selection
5. 付属品一覧 & Secondary Terminal Definition
6. インストール & 配線要件
7. 手術, Handling & Interlock Description
8. メンテナンス, 検査 & トラブルシューティング
9. 周囲条件
10. Replacement Model Information
11. Original Document Index
12. 製品概要 & 型式コードの説明

1.1 概要

MasterPact NT series low-voltage air circuit breakers for incoming feeders, bus ties and high-current outgoing feeders in 400/690V low-voltage distribution systems. NT06H2 maximum frame rating 630A, available in draw-out or fixed construction, spring charged operation, configurable with intelligent MicroLogic protection unit, supports remote signalling, metering and communication.

Important Reminder: Ui=1000V (定格絶縁電圧), Uimp=12kV (lightning impulse withstand voltage). NOT 12kV high voltage circuit breaker, only for AC ≤690V low-voltage distribution.

1.2 モデルの内訳

NT: MasterPact NT series air circuit breaker

06: フレームサイズ 06, frame rated current 630A

H2: Breaking class H2; Icu=50kA@440VAC, Icw=50kA 1s, Class B selective

部品番号:

NT06H2 3P Fixed: 47113

NT06H2 3P Draw-out: 47203

NT06H2 4P Fixed: 47119

1.3 製品の状態

NT series scheduled end-of-sale by end of 2025; replacement model MTZ1 06H2, part number LV947203 (引出し). Mounting dimensions and secondary interfaces fully compatible for direct replacement.

2. Rated Electrical Parameters

3. 機械的パラメータ, 全体の寸法 & 重さ

3.1 機械的耐久性

機械的寿命: 20,000 オペレーション (no-load make/break)

電気的寿命 (400V, で): 10,000 オペレーション

Spring charging: Manual charging / motor charging MCH optional

3.2 全体の寸法 (3P, ユニット: mm)

固定式: W300 × H415 × D266

引き出し式 (with cradle): W300 × H415 × D376

4P version width 360mm, height and depth unchanged

3.3 重さ

Fixed frame only: ≈32kg

Draw-out frame + cradle: ≈52kg

3.4 Three positions for draw-out version

1. Connected Position: Main circuit and secondary circuit fully connected, normal operation
2. Test Position: Main circuit disconnected, secondary circuit remains connected for protection test
3. Disconnected Position: Main and secondary circuits fully disconnected, breaker can be withdrawn for maintenance
4. MicroLogic Trip Unit Selection (Must be ordered separately, not included with frame)

Protection setting range: そして (長い間) 0.4~1×In; Isd short-time delay 0.5~10×In, delay 0.1/0.2/0.4s; Ii instantaneous 1~15×In.

5. 付属品一覧 & Secondary Terminal Definition

5.1 オプションのアクセサリ

1. MCH: Charging motor AC220V / DC24V
2. XF: Closing solenoid AC220V / DC24V
3. MX: シャントトリップコイル (リモートオープニング)
4. ミネソタ州: 不足電圧解除 (MNu time-delayed undervoltage for auto-transfer application)
5. の: 補助接点 (CB on/off status feedback)
6. SDE: Fault trip contacts (signal for overload/short-circuit/earth fault trip)
7. PF: Cradle position contacts (connected / test / disconnected position)
8. Phase barriers, cabinet door interlock, mechanical interlock cables, padlock device
9. ULP communication module: Modbus-RTU, remote signalling & 測光

5.2 Secondary Terminal Definition

6. インストール & 配線要件
7. 取り付け: 垂直直立設置, ±5° tilt allowed; inverted mounting prohibited
8. 主回路接続: フロント接続 / rear horizontal / rear vertical connection; apply specified tightening torque for copper busbars to avoid overheating
9. Secondary control wiring: 0.75~1.5mm² multi-core shielded cable; independent AC220V/DC24V control power supply for secondary circuit
10. 絶縁試験: Power frequency withstand test at Ui=1000V level; 12kV impulse withstand is type test only, no on-site 12kV impulse test
11. Draw-out operation: Use dedicated crank for rack-in / rack-out; prohibit racking out breaker from connected position under live condition
12. 手術, Handling & Interlock Description

7.1 Operation Procedure

1. Charging: Manual charging handle or MCH motor auto charging; charging complete, charged indicator lights on
2. 終わりに: Local front panel close pushbutton / XF remote close; verify interlock conditions before closing
3. オープニング: Local open pushbutton / MX remote opening / automatic protection tripping; after fault trip, fault reset button must be manually reset before re-closing

7.2 インターロック (Two-incoming one bus tie scheme)

機械的インターロック: Steel cable mechanical interlock, physically prevents simultaneous closing of three ACBs

Electrical interlock: Close circuit wired in series with normally closed contacts of other breakers for double protection

Cradle position interlock: Closing circuit blocked when not in connected position, closing prohibited

Fault trip interlock: Auto-transfer closing logic blocked upon SDE contact activation

8. メンテナンス, 検査 & トラブルシューティング

8.1 定期メンテナンス

Semi-annual: Check charging status, on/off indication, contact temperature rise, tightness of secondary wiring

年間: Dust cleaning, insulation inspection, trip unit test (using MicroLogic test cable)

オーバーホール (毎 5 年): Disassemble to inspect main contacts and arc chamber, mechanical lubrication, mechanical life verification

8.2 一般的なトラブルシューティング

1. 閉じられない

Incomplete charging; undervoltage MN coil de-energized; cradle not in connected position; interlock blocked; fault trip not reset

2. Unintended tripping

Verify protection curve; 地絡; harmonic overload; loose wiring with overheating; voltage dip triggering MN undervoltage trip

3. Charging failure

No power supply to MCH motor; jammed charging mechanism; damaged charged-ready contact

4. No fault signal output

Wrong SDE auxiliary contact wiring, 焼けた接点

9. 周囲条件

使用周囲温度: -5℃～+70℃; 40℃以上ではディレーティングが必要

保管温度: -40℃～+85℃

相対湿度: ≤95% (結露しないこと)

高度: ≤2000m; derating and insulation correction required above 2000m

保護の程度: Device IP30; IP40 with cabinet door closed

汚染度: 3

10. Replacement Model Information

NT06H2 → MTZ1 06H2

Frame 630A, Icu=50kA, compatible MicroLogic trip unit

取付寸法, primary busbar and secondary terminals fully compatible, no cabinet modification required for in-panel retrofit

Supports ECOSTRUXURE Power software commissioning, upgraded communication interface

Schneider MasterPact NT Full Series Model List (IEC Version, Discontinued ACB, Frame 630~1600A)

命名規則: NT + Frame Code + 授業の休憩時間

Frame Code: 06=630A; 08=800A; 10=1000A; 12=1250A; 16=1600A

授業の休憩時間: N1 / H1 / H2 / L1; 工事: 修理済み / 引き出し; Poles 3P/4P; Frame without trip unit, MicroLogic to be ordered separately

Common Base Parameters: Ui=1000V, Uimp=12kV, Ue max AC690V, Class B selective protection

Breaking Class Definition (440V, Icu ultimate breaking capacity)

N1: 35の

H1: 42の

H2: 50の (same class as NT06H2)

L1: 130の (current-limiting type, application for high short-circuit capacity)

NT Full Model List

Draw-out part number: 追加 10 to the last digit. Example NT06H2 3P Draw-out:47203; 4P fixed part number +6 (NT06H2 4P Fixed 47119)

Derivative Isolator Models (HA version)

NTxxHA: Isolator (without trip unit, IEC60947-3)

NT06HA / NT08HA / NT10HA / NT12HA / NT16HA

Compatible Trip Unit List (Universal for full NT series)

マイクロロジック 2.0: Long-time overload only

MicroLogic 5.0A: 長い間 + 短時間の遅延 + 瞬間的な (preferred for incoming / バスネクタイ)

MicroLogic 6.0A: 5.0あ + 地絡保護

MicroLogic 7.0A: 6.0あ + 残留電流保護 + harmonic measurement

Replacement Cross Reference Table (NT → MTZ1)

Selection Remarks

1. NT series fully discontinued, 新しいプロジェクトには推奨されません; MTZ1 can be used for spare parts replacement for existing projects with compatible primary and secondary interfaces.
2. L1 current-limiting type for systems with extremely high short-circuit current, より高いコスト; H2 is preferred for normal incoming feeder and bus tie.
3. Rated current can be derated within the same frame by changing current sensor inserts, 例えば. NT06 frame available with 400A/500A/630A sensors.