ABB TA25DU-25M 1SAZ211201R2051 Thermal Overload Relay 18-25A

Swiss ABB TA25DU-25M thermal overload relay, 3-pole (3P) bimetallic design, current setting range 18.0-25.0A, rated operating voltage 690V AC, trip class Class 10A, temperature compensation, 1 NC trip contact + 1 NO signal contact, automatic or manual reset selectable, trip-free mechanism, STOP and test function, direct mounting on ABB A series contactors or independent mounting, providing reliable overload and phase failure protection for motors, widely used in industrial motor starting and pro

online consultation

Product Details

I. Product Overview

The ABB TA25DU-25M is a TA25DU series thermal overload relay (Thermal Overload Relay) manufactured by Swiss ABB, adopting the bimetallic thermal tripping principle to provide reliable overload protection and phase failure protection for three-phase asynchronous motors. This relay has a current setting range of 18.0-25.0A, 3-pole (3P) design, trip class Class 10A, suitable for three-phase motor circuits with rated current not exceeding 25A.

The TA25DU series is ABB's classic economical electromechanical thermal overload relay series, using bimetallic thermal elements. The heat generated by the motor current causes the bimetallic strips to bend and deform, driving the tripping mechanism to operate for overload protection. This series features temperature compensation, maintaining stable tripping characteristics under ambient temperature variations; and phase failure protection (achieved through the differential mechanism), preventing motor burnout due to phase loss operation. The TA25DU series complies with IEC/EN 60947-4-1 and other standards, has passed multiple international certifications, and is widely used in industrial motor starting and protection circuits.

The TA25DU-25M can be directly mounted on ABB A series contactors (A9-A40, AE9-AE40, etc.) to form a motor starter, or panel-mounted via an independent mounting base (terminal block). The relay features 1 NC trip contact (95-96) and 1 NO signal contact (97-98), suitable for control circuit interlocking and fault signal indication. The reset mode can be selected between automatic or manual reset, and features a trip-free mechanism to ensure reliable operation of the tripping mechanism under all conditions. Additionally, the relay has a STOP button function and a test function for convenient on-site operation and functional verification. The product has a main circuit rated operating voltage of 690V AC, auxiliary circuit 500V AC, rated insulation voltage 690V, rated impulse withstand voltage 6kV, weight approximately 170g, reference dimensions 44mm × 80mm × 94mm.

II. Specifications

表格

Parameter	Value
Brand	ABB
Series	TA25DU
Model	TA25DU-25M
Order Code	1SAZ211201R2051 (China mall code 10135416)
Product Type	Thermal Overload Relay
Operating Principle	Bimetallic thermal tripping
Number of Poles	3P
Current Setting Range	18.0 ~ 25.0 A
Rated Operational Current (Ie)	25 A
Rated Operating Voltage (Ue)	Main circuit 690V AC / 440V DC
Auxiliary Circuit Voltage	500V AC / 440V DC
Rated Insulation Voltage (Ui)	690 V
Rated Impulse Withstand Voltage (Uimp)	6 kV
Rated Frequency (f)	Main circuit 50/60Hz, DC; Auxiliary circuit 50/60Hz, DC
Trip Class	Class 10A
Auxiliary Contacts	1NC (trip contact 95-96) + 1NO (signal contact 97-98)
Conventional Thermal Current of Auxiliary Contacts (Ith)	5 A
Phase Failure Protection	Yes (differential type)
Temperature Compensation	Yes (-20 to +55°C ambient temperature range)
Reset Mode	Automatic/manual selectable
Trip-free Mechanism	Yes
STOP Function	Yes (can be used as stop button)
Test Function	Yes
Trip Indication	Yes
Mounting	Direct mounting on A series contactors (A9-A40, AE9-AE40, BC9-BC30, TBC9-TBC30) or independent mounting (base)
Compatible Contactors	ABB A series/AE series/BC series contactors
Wiring Capacity	Main circuit (contact via email for confirmation)
Reference Dimensions	44mm × 80mm × 94mm
Weight	Approx. 170 g
Applicable Standards	IEC/EN 60947-4-1
Approvals	CE, CCC, etc. (contact via email for confirmation)
Country of Origin	Contact via email for confirmation (China/Switzerland, etc.)

III. Product Features

ABB quality, TA25DU series classic economical thermal overload relay, reliable performance
Bimetallic thermal tripping principle, accurate and reliable overload protection
3-pole (3P) design, suitable for three-phase motor circuits
Current setting range 18.0-25.0A, dial adjustment, easy to set
Trip class Class 10A, trips within 10 seconds (7.2×Ie), suitable for general industrial motor starting
Differential phase failure protection, preventing motor burnout from phase loss
Temperature compensation, maintaining stable tripping characteristics within -20 to +55°C ambient temperature range
1NC trip contact + 1NO signal contact, complete control interlocking and fault indication
Automatic/manual reset selectable, adapting to different application requirements
Trip-free mechanism, ensuring reliable tripping under all conditions
STOP button function, can also be used as a stop button
Test function, convenient for on-site functional verification
Clear trip indication, easy fault diagnosis
Direct mounting on ABB A series contactors to form motor starters, easy installation
Also supports independent panel mounting, flexible for various cabinet layouts
Rated operating voltage 690V AC, rated insulation voltage 690V, rated impulse withstand voltage 6kV
IEC/EN 60947-4-1 compliant, multiple international certifications
Widely used in industrial motor starting and protection circuits

IV. Typical Applications

Overload protection for three-phase asynchronous motors
Phase failure (phase loss) protection for motors
Combination with ABB A series contactors to form motor starters (direct-on-line starting)
Motor protection for industrial pumps, fans, compressors
Motor protection for conveyors, mixers, crushers and other machinery
Motor protection for HVAC systems
Motor protection for air compressors and refrigeration compressors
Motor protection for machine tools and automation equipment
Motor protection for building water supply and drainage systems
Motor protection circuits in metallurgy, chemical, mining, power industries

V. Model Description

TA25DU-25M is the complete model number for the ABB TA25DU series thermal overload relay. Where:

TA: ABB thermal overload relay series code (Thermal relay, bimetallic type)
25: Series frame size/design code
DU: Differential Unit, featuring phase failure protection
25: Upper limit of current setting range (25A, setting range 18.0-25.0A)
M: Version/config suffix (specific meaning, contact via email for confirmation)

The ABB TA25DU series thermal overload relay current setting ranges cover 0.1-32A. Common specifications include: TA25DU-0.16 (0.1-0.16A), TA25DU-0.25 (0.16-0.25A), TA25DU-0.4 (0.25-0.4A), TA25DU-0.63 (0.4-0.63A), TA25DU-1.0 (0.63-1A), TA25DU-1.6 (1-1.6A), TA25DU-2.4 (1.6-2.5A), TA25DU-4.0 (2.5-4A), TA25DU-6.0 (4-6A), TA25DU-10 (6.3-10A), TA25DU-14 (9-14A), TA25DU-20 (13-20A), TA25DU-25 (18-25A), TA25DU-32 (24-32A), etc. TA25DU-25M corresponds to the 18.0-25.0A specification, suitable for motor loads with rated current of 18-25A.

The TA25DU series can be directly mounted on ABB A9-A40, AE9-AE40, BC9-BC30, TBC9-TBC30 contactors, or panel-mounted via independent mounting bases. To confirm the detailed configuration of this model (wiring capacity, independent mounting base model, compatible contactor selection, auxiliary contact electrical parameters, etc.), please contact via email for confirmation. We will provide detailed technical documentation and selection support.

VI. Why Choose Us

Professional channel supply, comprehensive model coverage across multiple brands of industrial spare parts
Strict quality inspection process ensuring reliable product quality
Professional engineering team providing technical support and selection consultation
Quick response, efficient logistics, orders accepted
Quality assurance, worry-free after-sales service

VII. FAQ

Q1: How to select the current setting range of a thermal overload relay?

A: The current setting range of a thermal overload relay should cover the motor's rated current (FLA). Selection principle: the motor rated current should fall within the relay's setting range, and is typically set at 1.0-1.05 times the motor rated current (adjusted according to motor service factor and load characteristics). For TA25DU-25M (18.0-25.0A), it is suitable for three-phase motors with rated current of approximately 18-25A (corresponding to approximately 9-16kW motors at 380V). In actual selection, starting method, load type, ambient temperature and other factors should also be considered, and it is recommended that selection be performed by professional electrical engineers.

Q2: What does Class 10A trip class mean?

A: The trip class indicates the maximum tripping time of the thermal overload relay at 7.2 times the setting current. Class 10A means that at 7.2×Ie current, the relay trips within 10 seconds (actually 2-10 seconds). This is the standard trip class of the ABB TA25DU series, suitable for general industrial motor starting (applications where starting time does not exceed 10 seconds). For motors with heavy starting (longer starting time), thermal overload relays with Class 20 or Class 30 should be selected.

Q3: What is the difference between TA25DU-25M and TA25DU-25?

A: TA25DU-25M and TA25DU-25 have the same current setting range (18.0-25.0A) and basically identical main technical parameters. The difference lies in the version/config suffix (M). Their order codes differ: TA25DU-25M has order code 1SAZ211201R2051, while TA25DU-25 has order code 1SAZ211201R1051. For specific configuration differences (such as terminal forms, packaging, etc.), please contact via email for confirmation. We will provide accurate model comparison and selection recommendations.

Q4: How to use this relay with a contactor?

A: TA25DU-25M can be directly plugged and mounted on ABB A series contactors (such as A9-A40, AE9-AE40, etc.) to form a compact motor starter, without additional wiring (main circuit is directly connected through the contactor terminals). It can also be panel-mounted via an independent mounting base, with the main circuit wired from the base terminals. The auxiliary contacts (95-96 NC, 97-98 NO) are connected to the control circuit for overload interlocking and fault signal indication. For specific mounting methods, base models and wiring diagrams, please contact via email for confirmation. We will provide detailed documentation.

ꄴPrevious： ABB TA42DU-32M 1SAZ311201R2002 Thermal Overload Relay 22-32A

ꄲNext： ABB S202-C25 Miniature Circuit Breaker 2P C-Curve 25A S200 Series