ABB | THERMAL OVERLOAD RELAYS
Product overview
ABB TF42 thermal overload relays protect motors against overload and phase failure. Select the motor-current setting range, manual or automatic reset and the required mounting or remote-function accessory to obtain the exact relay and accessory order codes.
Key features
- Thermal overload protection from 0.10 to 38A, trip class 10.
- Manual or automatic reset, test and stop functions.
- One normally closed trip contact and one normally open signal contact.
Technical selection summary
| Current setting | 0.10–38A across the listed adjustable ranges |
|---|---|
| Trip class | 10 |
| Auxiliary contacts | 1NC + 1NO |
| Reset | Manual / automatic setting on the same relay |
| Mounting | Direct to suitable AF contactors; DB42 separate-mounting kit optional |
| Standards | IEC/EN 60947-4-1 and IEC/EN 60947-5-1 |
An overload relay does not provide short-circuit protection. Provide the required coordinated upstream protection. Remote reset requires manual-reset mode; remote reset and remote stop are offered as alternative configurations.
Accessories and installation
Choose an accessory function to reveal its available contact arrangement, quantity or supply-voltage options. The selection summary lists the complete accessory type, ABB ordering reference and quantity per base device.
| Mounting Kit | Separate mounting |
|---|---|
| Remote Function | Reset, Stop |
Typical applications
- Motor overload and phase-failure protection
- AF contactor motor starter assemblies
Technical documents
ABB Motor Protection and Control catalogue (complete PDF)
Related ABB products
ABB AF 3-pole contactors · ABB Electrical Materials
Catalogue data and dimensions
Series reference photographs are illustrative. Technical details, dimensions and notes below apply to the product types identified on each catalogue page.
