This product page details the ABB TA42 thermal overload relay, a robust motor protection device designed for medium-power three-phase applications. With an adjustable current range of 18-25A and a full load current of 25A, this 3-pole relay features both NO and NC auxiliary contacts with a 3.43W contact rating, providing reliable motor protection in demanding industrial environments.
Overview of the Thermal Overload Relay
The ABB TA42 thermal overload relay serves as a vital safeguard in motor control systems for medium-power applications. Because it continuously monitors motor current and responds to overload conditions using precision bimetal technology, it effectively prevents motor damage from excessive current draw while allowing for normal starting currents and temporary overloads.
Key Features and Technical Specifications
This motor protection device is engineered for medium-duty industrial applications. Therefore, here are its essential characteristics:
- Current Range: Adjustable 18-25A for medium-power motor protection
- Full Load Current: 25A maximum continuous current rating
- Poles: 3-pole configuration for three-phase motor protection
- Auxiliary Contacts: 1 NO + 1 NC for comprehensive control signaling
- Contact Rating: 3.43W for reliable control circuit operation
- Tripping Class: Class 10 for standard motor protection
- Mounting: Compatible with ABB contactors for integrated starters
- Standards: Compliant with IEC/EN 60947-4-1 standards
Typical Applications and Use Cases
The medium-current rating of this thermal overload relay makes it suitable for various industrial motor applications. For example, it is commonly used for:
- Three-phase motor protection up to 11kW at 400V
- Industrial pump and compressor motor control
- Conveyor system and material handling motors
- HVAC system large fan and pump motors
- Industrial machinery and processing equipment
- Mixer and agitator motor protection
- Ventilation and air handling system motors
For complete motor control solutions, explore our range of compatible ABB contactors for medium-power applications designed to work with TA series overload relays.
Why Choose the ABB TA42 Thermal Overload Relay?
Selecting the ABB TA42 thermal overload relay provides significant advantages for medium-power motor protection. Firstly, the precise 18-25A adjustable range allows exact matching to motor nameplate current for motors in the 7.5-11kW range, providing optimal protection without nuisance tripping. Secondly, the higher 3.43W contact rating ensures reliable operation in control circuits with higher power requirements. Consequently, you achieve robust motor protection with enhanced control circuit capability for demanding industrial applications.
Installation and Setting Guidelines
Proper installation and calibration of this thermal overload relay are essential for effective motor protection. Mount the relay directly to a compatible ABB contactor, ensuring secure mechanical and electrical connection. Set the current adjustment dial to match the motor’s exact full-load current as specified on the motor nameplate, ensuring it falls within the 18-25A range. Furthermore, utilize the auxiliary contacts according to your control scheme—typically using the NC contact for safety interlocking and the NO contact for alarm indication or remote monitoring.
For detailed technical specifications and application guidelines, consult the comprehensive ABB TA thermal overload relay documentation.
Secure Your Medium-Power Motor Applications Today
In summary, the ABB TA42 thermal overload relay with its 18-25A adjustable range and robust contact rating represents a reliable solution for medium-power three-phase motor protection. Finally, by incorporating this precision protection device into your motor control systems, you ensure equipment safety, operational reliability, and extended motor lifespan in your industrial applications.
