ABB TA25DU‑25M Thermal Overload Relay

Correct Model: ABB TA25DU‑25M

Global ID: 1SAZ211201R2051

Ordine n.: 10135416

Tipo di prodotto: Economical electromechanical thermal overload relay

Model Designation Breakdown:

2. Parametri tecnici chiave

3. Funzioni principali & Caratteristiche
4. Reliable motor protection: Fast and reliable protection against overload and phase failure, compliant with IEC 60947‑4‑1
5. Temperature compensation: Maintains stable protection characteristics over a wide ambient temperature range to prevent unwanted tripping
6. Funzione di prova: Equipped with TEST button for on-site function verification
7. Free tripping mechanism: Ensures reliable tripping under all conditions, independent of reset operation
8. Trip indication: Clearly shows if relay has tripped due to overload
9. Economico & practical: Part of ABB’s economical thermal overload relay series with high cost‑performance
10. Applicazioni & Compatible Contactors

4.1 Applicazioni tipiche

Overload and phase failure protection for three‑phase asynchronous motors, particolarmente 7.5 kW–11 kW (380V) motori

Motor protection for industrial automation lines, tifosi, pompe, compressori, ecc.

Forms a complete motor starting and protection unit with AX series contactors

4.2 Compatible Contactors

Raccomandato: AX25‑30‑10/01, AX32‑30‑10/01 (25–32A rated current)

Compatible: Full AX09–AX40 series, AL9–AL40 series contactors

Montaggio: Direct clip‑on mounting (compatto) or separate base mounting

5. Alternative multimarca

6. TA25DU Series Full Model Matrix

TA25DU series covers a setting current range of 0.1A–25A:

7. Montaggio & Note sul cablaggio
8. Orientamento di montaggio: Vertical installation recommended for good heat dissipation
9. Wiring specification: Main circuit conductor cross‑section 2×1.5–6mm², Viti M4, torque 1.44–1.92Nm
10. Contatti ausiliari: 95 (NC), 96 (NO) for control circuit or signal indication
11. Reset selection: Manuale (Man) or automatic (Aut) reset via switch

The ABB TA25DU‑25M is a reliable and economical thermal overload relay, mainly used for three‑phase motor protection in the 18–25A setting range. It is especially suitable for use with AX series contactors and widely applied in various industrial automation equipment. Its comprehensive protection, temperature compensation, and convenient mounting make it an ideal choice for small and medium‑sized motor protection.

Complete Application Guide for ABB TA25DU‑25M Thermal Overload Relay

1. Core Application Positioning

The TA25DU‑25M is an economical thermal overload relay with a setting range of 18.0–25.0A and trip class 10A.

It mainly provides overload, phase failure and phase unbalance protection for three‑phase asynchronous motors,

especially suitable for motors from 7.5 kW a 22 kW (380V/400 V).

Combined with AX series contactors, it forms a complete motor control and protection unit.

2. Applications by Industry

Automazione industriale & Manufacturing

1. Production line drive systems

Trasportatori, sorting equipment: protection against overload from material buildup or jamming

Macchine utensili, hydraulic pumps: ensures machining accuracy and equipment safety

Packaging and printing machinery: avoids downtime from load fluctuations

2. General machinery

Compressori (air, refrigeration): protects against overpressure and overheating

Tifosi (industrial exhaust, cooling tower): suitable for long‑time continuous operation

Pompe (circulation, cooling, booster): protects against pipe blockage or insufficient water supply

3. Attrezzature per la movimentazione dei materiali

Gru, montacarichi: prevents safety risks from overload

Miscelatori, agitatori: adapts to highly variable load conditions

🏢 Building & Infrastrutture

1. Automazione degli edifici

HVAC fans, cooling towers, chilled water pumps

Fire protection systems: smoke exhaust fans, spray pumps

Elevators and escalators: ensures passenger safety

2. Construction equipment

Small construction machinery: concrete mixers, mortar pumps

Temporary power systems on construction sites

🏗️ Energy & Utilities

1. Trattamento dell'acqua

Aeration fans, sludge return pumps, lift pumps in wastewater treatment plants

Water supply pumps and booster pumps in waterworks

2. Power auxiliary systems

Cooling systems in substations and power plants

Auxiliary motors for PV inverters and wind turbines

🌾 Agriculture & Food Processing

1. Agricultural irrigation

Large irrigation pumps: adapts to varying water sources and leakage conditions

Greenhouse ventilation and cooling systems

2. Food processing machinery

Miscelatori, slicers, macchine confezionatrici: suitable for humid and dusty environments

Compressors and fans in cold storage and refrigeration systems

3. Applications by Operating Conditions

🔧 Harsh Environment Applications

1. Wide temperature variation: Con compensazione della temperatura (-25°C fino a +55°C), suitable for outdoor and workshop environments
2. Avvio frequente & fermandosi: Trip class 10A ideal for high‑start‑frequency motors
3. Phase failure risk: Built‑in phase failure protection for unstable power supplies

🛡️ Safety‑Critical Applications

1. Public areas: Ascensori, scale mobili, Sistemi HVAC
2. 24‑hour continuous systems: Production lines, data center cooling

💡 Economical Applications

1. SME equipment: High cost‑performance for budget‑conscious users
2. Equipment retrofitting: Direct replacement for older relays, compatible with existing AX/AL contactors
3. Typical Motor Ratings & Application Examples

5. Key Advantages Summary
6. Protezione completa: Sovraccarico, mancanza di fase, phase unbalance – IEC 60947‑4‑1 compliant
7. Adattabilità ambientale: Temperature compensation avoids nuisance tripping
8. Easy operation: Manual/automatic reset + TEST button
9. Flexible mounting: Direct on contactor or separate base
10. Economico & affidabile: Cost‑effective for mass deployment on small and medium motors

Conclusione

With its 18–25A setting range and 10A trip characteristics, the ABB TA25DU‑25M is widely used in industrial automation, building services, energia, agriculture and other fields.

It is especially suitable for three‑phase motors from 7.5 kW a 22 kW.

Its complete protection, environmental stability and economy make it an excellent choice for small and medium motor protection, especially when combined with AX series contactors to build efficient and reliable motor control and protection systems.