ABB TA, TF, EF & T Overload Relays

Thermal and electronic protection

TA, TF and T thermal relays use bimetal elements; EF devices use electronic overload protection. They operate the starter control circuit when a fault is detected. An overload relay does not replace the required short-circuit protective device.

Product groups in the existing list

The list includes TA25DU, TA42DU, TA75DU, TA110DU and TA200DU references; TF42, TF65, TF96 and TF140DU; T16; and several EF sizes. It also retains TA2X1.2, TA2X2.2 and TA2X3.2 references, which ABB Chinese-market documentation identifies as the three TA2X.2 thermal-relay frames. These regional products must be checked against their own documentation.

Available setting ranges, trip classes, mounting arrangements and approvals depend on the exact relay. For example, ABB documentation describes selectable 10E/20E/30E trip classes for specified EF electronic relays; this must not be applied to all thermal or historical references.

Selection and installation conditions

• Match the adjustment range to the motor nameplate current and the actual circuit arrangement. Starting time and operating duty influence the required trip class.
• Confirm contactor type, direct or separate mounting, terminals and the exact mounting accessory. Do not assume compatibility from the family name.
• Verify supply and control-circuit requirements, trip and signalling contacts, manual or automatic reset and the machine restart procedure.
• Check phase-loss protection, ambient temperature, compensation and single-phase wiring in the specific operating instructions.
• Confirm operating voltage, short-circuit protective device and tested starter coordination. IEC/EN and regional approvals must be verified for the ordered reference.

Model and quotation information

The table remains an identification reference. Historical settings, approvals or version relationships that cannot be verified by complete code remain subject to documentation checks; no replacement or interchangeability is implied.

Send the full model and ABB Order Code, quantity and destination country. Include motor rated current, voltage, starting duty, contactor reference, mounting method, required reset mode and any applicable standards. For existing equipment, add a nameplate photo and wiring or assembly details.

Browse Contactors & Motor Starters, AF contactors or Contact. Official references: ABB contactors and overload relays guide and ABB TA2X.2 regional catalogue.