ABB TA42DU-42M 1SAZ311201R2003 Thermal Overload Relay 29-42A

Swiss ABB TA42DU-42M thermal overload relay, 3-pole (3P) bimetallic design, current setting range 29.0-42.0A, 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 A30/A40 contactors or independent mounting, providing reliable overload and phase failure protection for motors, widely used in industrial motor starting and prot

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Product Details

I. Product Overview

The ABB TA42DU-42M is a TA42DU 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 29.0-42.0A, 3-pole (3P) design, trip class Class 10A, suitable for three-phase motor circuits with rated current not exceeding 42A.

The TA42DU 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 TA42DU 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 TA42DU-42M can be directly mounted on ABB A30, A40, BC30 contactors 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, rated insulation voltage 690V, rated impulse withstand voltage 6kV, weight approximately 335g, reference dimensions 54mm × 90mm × 111mm.

II. Specifications

表格

Parameter	Value
Brand	ABB
Series	TA42DU
Model	TA42DU-42M
Order Code	1SAZ311201R2003
Product Type	Thermal Overload Relay
Operating Principle	Bimetallic thermal tripping
Number of Poles	3P
Current Setting Range	29.0 ~ 42.0 A
Rated Operational Current (Ie)	42 A
Rated Operating Voltage (Ue)	Main circuit 690V 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
Number of Protected Poles	3
Auxiliary Contacts	1NC (trip contact 95-96) + 1NO (signal contact 97-98)
Conventional Thermal Current of Auxiliary Contacts (Ith)	NC 10A, NO 6A
Phase Failure Protection	Yes (differential type)
Temperature Compensation	Yes
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 A30/A40/BC30 contactors or independent mounting (base)
Compatible Contactors	ABB A30, A40, BC30, etc.
Reference Dimensions	54mm × 90mm × 111mm
Weight	Approx. 335 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, TA42DU 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 29.0-42.0A, 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
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 A30/A40/BC30 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 medium-to-large power industrial pumps, fans, compressors
Motor protection for conveyors, mixers, crushers, mills 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

TA42DU-42M is the complete model number for the ABB TA42DU series thermal overload relay. Where:

TA: ABB thermal overload relay series code (Thermal relay, bimetallic type)
42: Series frame size/design code
DU: Differential Unit, featuring phase failure protection
42: Upper limit of current setting range (42A, setting range 29.0-42.0A)
M: Version/config suffix (specific meaning, contact via email for confirmation)

The ABB TA42DU series thermal overload relay current setting ranges cover 18-42A. Common specifications include: TA42DU-25 (18-25A, order code 1SAZ311201R1001), TA42DU-32 (22-32A, order code 1SAZ311201R1002), TA42DU-42 (29-42A, order code 1SAZ311201R1003), etc. TA42DU-42M corresponds to the 29.0-42.0A specification, the largest current specification of the TA42DU series, suitable for motor loads with rated current of 29-42A.

The TA42DU series can be directly mounted on ABB A30, A40, BC30 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: What is the current setting range of TA42DU-42M?

A: According to the ABB official datasheet, the current setting range of TA42DU-42M is 29.0-42.0A, with rated operational current (Ie) of 42A. This specification is suitable for three-phase motors with rated current of approximately 29-42A (corresponding to approximately 15-22kW motors at 380V). The current setting value should be adjusted according to the motor nameplate rated current, typically set at 1.0-1.05 times the motor rated current. 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/TA42DU 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 current specifications are available in the TA42DU series?

A: The TA42DU series has 3 current specifications in total: TA42DU-25 (18-25A, order code 1SAZ311201R1001), TA42DU-32 (22-32A, order code 1SAZ311201R1002), TA42DU-42 (29-42A, order code 1SAZ311201R1003). TA42DU-42M is the M version of TA42DU-42 (order code 1SAZ311201R2003), the largest current specification of this series, suitable for motor loads of 29-42A. Selection is determined by the motor rated current and the matching contactor specification.

Q4: How to use this relay with a contactor?

A: TA42DU-42M can be directly plugged and mounted on ABB A30, A40, BC30 contactors 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.

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