ABB - Electrification TF42-10 - The TF42-10 thermal overload relay is an economic electromechanical protection device for the main circuit. It offers reliable and fast protection for motors in the event of overload or phase failure. The device has trip class 10. Further features are the temperature compensation, trip contact (NC), signal contact (NO), automatic- or manual reset selectable, trip-free mechanism, STOP function and a trip indication. The overload relays are connected directly to the block contactors. Single mounting kits are available as accessory.
ABB - Electrification

TF42-10

Contact for Pricing

Overview

The ABB TF42-10 thermal overload relay (SKU: TF42-10) is a compact electromechanical protection device designed for direct connection to ABB block contactors in industrial motor control systems. Rated at 40A with Trip Class 10, it provides reliable protection against overload conditions and phase failure in 3-phase motors operating at 240VAC (10 HP), 480VAC (20 HP), or 600VAC (25 HP). The relay features integrated temperature compensation for stable performance across ambient conditions ranging from -25°C to +55°C, ensuring consistent tripping accuracy regardless of environmental fluctuations. Key specifications include a normally closed (NC) trip contact for immediate shutdown signaling and a normally open (NO) signal contact for status monitoring. Users can select between automatic or manual reset modes, with a trip-free mechanism preventing reset during fault conditions. The device also includes a dedicated STOP function and clear trip indication for rapid diagnostics. The TF42-10 is designed for direct mounting on ABB contactors (AF09 to AF370 series) and is compatible with single mounting kits for versatile installation configurations. With a weight of 0.16 kg (0.35 lb) and dimensions optimized for space-constrained panels, this relay is ideal for applications in manufacturing, HVAC systems, pumps, conveyors, and other industrial machinery where motor protection is critical. The relay meets UL508 standards (File #E63822) and offers a short-circuit rating of 5kA with RK5-type fuses. Its 4-pole configuration supports balanced load distribution, while the compact design minimizes panel space requirements. The TF42-10 is manufactured in the US, ensuring compliance with domestic industrial standards and providing a reliable solution for motor protection in demanding environments.
  • 40A rated thermal overload relay for 3-phase motors up to 25 HP (240V/480V/600V)
  • Trip Class 10 for fast protection against overload and phase failure
  • Temperature compensation (-25°C to +55°C) for stable tripping accuracy
  • NC trip contact, NO signal contact, automatic/manual reset, STOP function
  • Direct mount on ABB contactors (AF09 to AF370 series), 0.16 kg weight

Specifications

Ambient Air Temperature
Operation -25 ... +60 °C / Operation Compensated -25 ... +60 °C / Storage -50 ... +80 °C
Application
Mainly used for controlling 3-phase motors and generally for controlling power circuits up to 690 V AC and 220 V DC. The contactors can also be used for many other applications such as bypass, capacitor switching, lighting, DC power circuits.
Mounting Type
Direct mount on block contactors
Product Name
Thermal Overload Relay
Series
TF42
Size
82x110x108mm
Special Features
The TF42-10 thermal overload relay is an economic electromechanical protection device for the main circuit. It offers reliable and fast protection for motors in the event of overload or phase failure. The device has trip class 10. Further features are the temperature compensation, trip contact (NC), signal contact (NO), automatic- or manual reset selectable, trip-free mechanism, STOP function and a trip indication. The overload relays are connected directly to the block contactors. Single mounting kits are available as accessory.
Standard
RoHs, CSA, cUL, CE, GOST
Trip Class
class 10
Type
Contactors
Voltage Rating
Auxiliary Circuit 600 V AC / DC / Main Circuit 690 V AC
Package Dimensions (L x W x H)
3.071 IN x 1.89 IN x 3.622 IN
Package Dimensions (L x W x H)
7.8003 cm x 4.8006 cm x 9.1999 cm
Package Weight (Imperial)
0.350 L
Package Weight (Metric)
0.159 kg
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The NNC75X75WH2 Halogen-Free Wide Slot Wiring Duct is used to route, protect, and manage wires near sensitive electronic equipment and in environments where heat resistance or public safety is a concern. UL 94 flame class of V-0 with a UL recognized continuous-use temperature up to 95 C (203 F). Halogen-Free, Polyphenylene Oxide (PPO). Mounting holes provided. 2.85" x 2.97" (72.4 mm x 75.4 mm) and 6.6' (2 m) long. Cover included. Color White. 5 pieces per package.

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Frequently Asked Questions about ABB - Electrification

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ABB - Electrification products comply with a comprehensive range of international certifications and standards, including UL (United States), CSA (Canada), CE (European Community), UKCA (United Kingdom), EAC (Russia), and C-Tick (Australia & New Zealand). Our products meet critical international standards such as IEC 60947 series for low-voltage switchgear, functional safety standards EN 61800-5-2 and ISO 13849-1, and marine classification standards from Bureau Veritas, DNV, and Lloyd's Register of Shipping.

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ABB - Electrification products are engineered for critical applications across multiple industries, including Energy, Oil & Gas, Manufacturing, Power Generation, HVAC, Marine, Food & Beverage, Mining, Pulp & Paper, Water Treatment, and Automotive. Their solutions cover essential electrical infrastructure needs such as switchgear, power distribution systems, circuit protection, digital control technologies, and drive systems designed for high-reliability environments with a strong focus on sustainability, efficiency, and safety.

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ABB - Electrification offers comprehensive technical support through multiple channels, including a dedicated technical support hotline at 888-385-1221 (Option 1), available 7:00 a.m. - 5:00 p.m. CST, Monday-Friday. Their support services encompass 24/7/365 emergency services, on-site support, remote monitoring and diagnostics, installation and commissioning, equipment assessments, repair coordination, and multi-vendor technical assistance. Customers can also access resources like personnel safety training, disaster recovery support, and service agreements tailored to their specific electrification needs.

What are the main product lines offered by ABB - Electrification?

ABB - Electrification offers a comprehensive range of electrical distribution and protection products, including circuit monitoring systems, panelboards, switchgear, motor control centers, circuit breakers, softstarters, and power distribution solutions. Key product lines span low and medium voltage applications across utilities, commercial, industrial, healthcare, and manufacturing sectors, with specialized offerings like the ReliaGear® panelboards, SMISSLINE TP bus systems, and Ekip UP protection and metering relays.

What are the key features of ABB - Electrification products?

ABB - Electrification products feature advanced integrated design elements that enhance industrial performance and reliability. Key features include harmonics and EMC design, integrated DC choke, removable terminals for fast installation, USB ports for troubleshooting, and integrated Safe Torque Off (STO) functionality. The products deliver superior motor control capabilities, support both induction and permanent magnet motors, and offer robust operational features like side-by-side mounting without derating and operation at temperatures up to 45°C. Additionally, ABB's Electrification solutions emphasize digital innovation, with technologies like Novolink enabling predictive maintenance, enhanced analytics, and seamless system integration.

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ABB - Electrification products support a comprehensive range of industrial communication protocols, including Modbus RTU, PROFIBUS DP, PROFINET, EtherNet/IP, CANopen, DeviceNet, and IEC 61850. These protocols enable flexible connectivity across multiple industrial automation platforms, with support for various network topologies and high-speed data transmission up to 100 Mbps.