접촉기,회로 차단기,감지기,인코더,PLC,변환기
주문번호: 1SAZ211201R2035
TA25DU-5.0M is a 3-phase bimetallic 열 과부하 릴레이 in the TA25DU 시리즈. The M variant is designed for AX series 접촉기 (non‑M versions fit A series contactors). It provides motor overload and phase failure protection.
✅ Core Technical Parameters
조정 가능한 전류 범위: 3.5 ~ 5.0 에이
여행 클래스: 10에이 (standard motor protection)
Rated main circuit voltage: 교류 690V / DC 440V
폴란드: 3-극 보호
보조 접점: 1아니요 + 1NC (one changeover contact)
재설정 모드: 수동 / Automatic reset selectable
내장된 기능: 온도 보상, 위상 오류 보호, 테스트 버튼, STOP function, 여행 표시, 트립 프리 메커니즘
Compatible contactors: AX09, AX12, AX18, AX25 (direct plug-in mounting)
독립형 장착: Requires separate mounting base as an accessory
📌 Type Code Definition
깃 달기: 열 과부하 릴레이
25: Frame rated current 25A
의: Universal bimetallic type
5.0: Maximum setting current 5A
중: 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 (380다섯), applied on machine tools, 팬, 물 펌프, conveyors and compressors. It forms a motor starter circuit together with 씨줄 AX contactors.
⚠️ 선택 & 교체 지침
- 동일 시리즈 교체: TA25DU-5.0 (older version for A contactors; pin layout differs and cannot be directly interchanged)
- 국내 대안: 맛있는, Chint thermal relays with 3.5–5A range (verify contact configuration, trip class and mounting base)
- 조정: Short-circuit protection shall be implemented with fuses or circuit breakers. This relay only provides overload & 위상 오류 보호, not short-circuit protection.
📎 Auxiliary Contact Ratings (AC-15)
400다섯: NC 0.75A, NO 0.37A
240다섯: NC 3A, NO 1.2A
120다섯: NC 3A, NO 1.5A
Operating Principle of ABB TA25DU Bimetallic Thermal Overload Relays
핵심원리: Thermal effect of electric current + differential bending of bimetallic strips; inverse-time overload & 위상 오류 보호. 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 + bimetallic strip. Additional components: differential slide plate, temperature compensation strip, quick-trip mechanism, 1NO+1NC 보조 접점 (95/96 NC, 97/98 아니요), setting knob, reset mechanism and test button.
바이메탈 스트립: Two metals with different thermal expansion coefficients bonded together; it bends toward the lower-expansion side when heated.
- 정상 작동
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. 그만큼 95-96 NC contact remains closed, the contactor coil stays energized, 그리고 모터는 정상적으로 작동합니다.
- 과부하 보호 (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, 그만큼 95-96 NC 접점 열림, the ABB contactor coil de-energizes, main contacts break and the motor stops.
특징: 반한시 특성: Higher overload current leads to faster tripping. Short starting inrush current will not cause false tripping (여행 등급 10A, standard rating for TA25DU series), simulating the thermal inertia of motor windings.
- Phase Failure (위상 손실) 보호 (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)
| 상표 | 모델 | 일치하는 접촉기 | 현재 범위 |
| 씨줄 | TA25DU-5.0M | AX09~AX40 | 3.5～5A |
| 슈나이더 | LRD07C | LC1D09~D40 | 3.5～5A |
| 지멘스 | 3RU6116-1FB0 | 3RT60 (S0 프레임) | 3.5～5A |
| 옴론 | TK-E07 | CJX2/MC series | 3.5～5A |
| 친트 | NR2-25/지 5 | CJX2-09~25 | 3.5～5A |
| 맛있는 | 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 |
부분 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: High-current models (90～200A)
부분 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.
- 결상 보호: 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.
- 재설정 모드: Keep manual/automatic reset consistent with the original unit to avoid unintended auto-restart for unattended equipment.
부분 5: Simplest Replacement Plan for TA25DU-5.0M
Import alternatives: Schneider LRD07C, Siemens 3RU6116-1FB0
국내 대안: Chint NR2-25/Z 5, Delixi CDR6-25 5
OEM same-model replacement: TA25DU-5.0M (주문 번호. 1SAZ211201R2035)
