コンタクタ,サーキットブレーカー,センサー,エンコーダ,PLC,コンバータ
注文番号: 1SAZ211201R2035
TA25DU-5.0M is a 3-phase bimetallic サーマル過負荷リレー in the TA25DU シリーズ. The M variant is designed for AX series 接触器 (non‑M versions fit A series contactors). It provides motor overload and phase failure protection.
✅ Core Technical Parameters
Adjustable current range: 3.5 ～ 5.0 あ
旅行クラス: 10あ (standard motor protection)
Rated main circuit voltage: AC690V / DC 440V
極: 3-ポールプロテクション
補助接点: 1いいえ + 1ノースカロライナ州 (one changeover contact)
リセットモード: マニュアル / Automatic reset selectable
Built-in functions: 温度補償, 欠相保護, テストボタン, STOP function, トリップ表示, trip-free mechanism
Compatible contactors: AX09, AX12, AX18, AX25 (direct plug-in mounting)
スタンドアロン取付: Requires separate mounting base as an accessory
📌 Type Code Definition
フェイシング: サーマルリレー
25: Frame rated current 25A
の: Universal bimetallic type
5.0: Maximum setting current 5A
M: Version for AX contactors (differentiated from older TA25DU-5.0 for A contactors)
📋 Typical Applications
Protection for 0.75~2.2kW 3-phase asynchronous motors (380V), applied on machine tools, ファン, ウォーターポンプ, conveyors and compressors. It forms a motor starter circuit together with ABB AX contactors.
⚠️セレクション & 交換ガイドライン
- Same-series replacement: TA25DU-5.0 (older version for A contactors; pin layout differs and cannot be directly interchanged)
- 国内代替品: 美味しい, Chint thermal relays with 3.5–5A range (verify contact configuration, trip class and mounting base)
- 調整: Short-circuit protection shall be implemented with fuses or circuit breakers. This relay only provides overload & 欠相保護, not short-circuit protection.
📎 Auxiliary Contact Ratings (AC-15)
400V: NC 0.75A, NO 0.37A
240V: NC 3A, NO 1.2A
120V: NC 3A, NO 1.5A
Operating Principle of ABB TA25DU Bimetallic Thermal Overload Relays
Core principle: Thermal effect of electric current + differential bending of bimetallic strips; inverse-time overload & 欠相保護. It only works with contactors for motor overload protection and cannot protect against short circuits.
- Basic 3-phase Structure
Each phase is equipped with: heating element + バイメタルストリップ. Additional components: differential slide plate, temperature compensation strip, quick-trip mechanism, 1NO+1NC補助接点 (95/96 ノースカロライナ州, 97/98 いいえ), setting knob, reset mechanism and test button.
バイメタルストリップ: Two metals with different thermal expansion coefficients bonded together; it bends toward the lower-expansion side when heated.
- 通常動作
Three-phase current equals the set value. Heat generation is low, and the bimetallic strip only bends slightly, not enough to trigger the trip mechanism. の 95-96 NC contact remains closed, the contactor coil stays energized, and the motor runs normally.
- 過負荷保護 (Inverse-time Characteristic)
Sustained motor overload → current exceeds setting → heating element keeps rising in temperature, and the bimetallic strip bends further with accumulated heat.
Once the deformation threshold is reached, the quick-trip mechanism releases, の 95-96 NC接点が開く, the ABB contactor coil de-energizes, main contacts break and the motor stops.
特徴: 逆時間特性: Higher overload current leads to faster tripping. Short starting inrush current will not cause false tripping (トリップクラス 10A, standard rating for TA25DU series), simulating the thermal inertia of motor windings.
- 欠相 (欠相) 保護 (Built-in Differential Mechanism on TA25DU)
When three-phase current is unbalanced or one phase is lost:
The open phase carries nearly zero current; its bimetallic strip cools down and springs back.
The other two phases draw much higher current, and their bimetallic strips keep bending.
The differential slide plate amplifies the deformation difference, triggering tripping much faster than regular balanced overload protection. This prevents motor burnout due to phase loss, a standard feature on ABB DU-series thermal relays.
1) Direct Cross-Brand Equivalent (TA25DU-5.0M, 3.5～5A)
| ブランド | モデル | Matching Contactor | 電流範囲 |
| ABB | TA25DU-5.0M | AX09~AX40 | 3.5～5A |
| シュナイダー | LRD07C | LC1D09~D40 | 3.5～5A |
| シーメンス | 3RU6116-1FB0 | 3RT60 (S0フレーム) | 3.5～5A |
| オムロン | TK-E07 | CJX2/MC series | 3.5～5A |
| チント | NR2-25/Z 5 | CJX2-09~25 | 3.5～5A |
| 美味しい | CDR6-25 5 | CJX2 | 3.5～5A |
2) Full Series Cross Reference Table (TA25DU-M vs Competitors)
| ABB TA25DU-M | Schneider LRD | Siemens 3RU61 (S0) | Chint NR2-25/Z |
| 0.10～0.16A | LRD01C | 3RU6116-0AA0 | NR2-25/Z 0.16 |
| 0.4～0.63A | LRD03C | 3RU6116-0BB0 | NR2-25/Z 0.63 |
| 1.0～1.4A | LRD05C | 3RU6116-0CB0 | NR2-25/Z 1.4 |
| 1.7～2.4A | LRD06C | 3RU6116-0DB0 | NR2-25/Z 2.4 |
| 2.8～4.0A | LRD07C | 3RU6116-1EB0 | NR2-25/Z 4 |
| 3.5～5.0A | LRD07C | 3RU6116-1FB0 | NR2-25/Z 5 |
| 4.5～6.5A | LRD08C | 3RU6116-1GB0 | NR2-25/Z 6.5 |
| 7.5～11A | LRD10C | 3RU6116-2HB0 | NR2-25/Z 11 |
| 13～19A | LRD12C | 3RU6116-2JB0 | NR2-25/Z 19 |
| 18～25A | LRD14C | 3RU6116-2KB0 | NR2-25/Z 25 |
一部 3: Extended Frame Sizes (TAxxDU-M Series)
TA42DU-M: For AX40~AX50 contactors, 25～42A
TA75DU-M: For AX65~AX80 contactors, 25～75A
TA80DU / TA110DU / TA200DU: 大電流モデル (90～200A)
一部 4: Field Replacement Notes
- Non-interchangeable base: TA25DU-M only plugs onto AX contactors; older TA25DU fits A contactors. Mismatched mounting will cause loose connection and overheating.
- Strictly match current range: Select relays with fully overlapping setting ranges; never use higher current ratings to replace lower ones.
- 欠相保護: TA25DU has built-in differential phase-loss protection. Siemens 3RU and Schneider LRD also include this function; confirm this feature before purchasing low-cost domestic models.
- リセットモード: Keep manual/automatic reset consistent with the original unit to avoid unintended auto-restart for unattended equipment.
一部 5: Simplest Replacement Plan for TA25DU-5.0M
Import alternatives: Schneider LRD07C, Siemens 3RU6116-1FB0
国内代替品: Chint NR2-25/Z 5, Delixi CDR6-25 5
OEM same-model replacement: TA25DU-5.0M (注文番号. 1SAZ211201R2035)
