ABB TF42-29 Thermal Overload Relay 24 ... 29 A ABB
ABB TF42-29 Thermal Overload Relay 24 ... 29 A ABB

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ABB

ABB TF42-29 Thermal Overload Relay 24 ... 29 A

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ABB TF42-29 Thermal Overload Relay

The TF42-29 is a 24–29A thermal overload relay providing economic electromechanical protection for motor main circuits against overload and phase failure. Designed to mount directly onto compatible ABB AF-series contactors, it offers trip class 10 performance with temperature compensation, making it a dependable choice for motor control panels in UAE industrial and commercial installations.

Key Features

  • 24–29A adjustable setting range for accurate protection matched to motor full-load current
  • Trip class 10 with temperature-compensated bimetallic tripping for reliable performance across ambient conditions
  • Selectable automatic or manual reset with trip-free mechanism and clear trip indication
  • Integrated STOP function for straightforward manual isolation during maintenance
  • Genuine ABB quality — direct mounting compatibility with ABB AF09 through AF38 contactors

Technical Specifications

Specification Details
Brand ABB
Model TF42-29
Rated Operational Current (Ie) 29A
Setting Range 24-29A
Poles 3P
Trip Class 10
Rated Operational Voltage 690V AC / 600V DC
Auxiliary Contacts 1 NC + 1 NO
Degree of Protection IP20
Suitable For ABB AF09, AF12, AF16, AF26, AF30, AF38 Contactors
Ambient Operating Temperature -25°C to +60°C

Applications

  • Motor overload and phase failure protection in HVAC and pump control panels
  • Direct-on-line and star-delta motor starter assemblies in industrial facilities
  • Panel builds requiring compact, contactor-mounted thermal protection
  • Retrofit protection upgrades for existing ABB AF-series contactor installations

FAQ

  • What does this relay protect?
    It provides overload and phase-failure protection for the motor circuit it's fitted to, tripping the associated contactor if the current draw exceeds the set threshold for too long.
  • Does this mount directly onto a contactor?
    Check the Technical Specifications table for the specific compatible contactor range — many ABB thermal overload relays mount directly onto a matching contactor without separate wiring for the current path.
  • What is trip class 10?
    Trip class defines how long the relay allows an overload before tripping at a given multiple of the set current — class 10 is a standard general-purpose setting suited to most motor applications (as opposed to class 20/30 used for high-inertia loads with longer start times).
  • Can I install this myself?
    No. This is a motor control panel component and should be installed and set by a licensed electrician or panel builder.

Orders placed before 12 PM (UAE time) are dispatched the same business day and delivered in 1–2 business days across the UAE. Delivery is free on orders over AED 200; below that it costs AED 15. International shipping is charged by weight at checkout, and international orders cannot be returned. Read our Shipping Policy and Refund Policy.

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