ABB | THERMAL OVERLOAD RELAY
Product overview
The ABB TF42-38 thermal overload relay provides motor overload and phase-loss protection for the adjustable current range 35-38A. The exact ABB ordering reference is 1SAZ721201R1055. It has trip class 10.
Key features
- Bimetal overload protection with trip class 10
- Manual/automatic reset selection, test/stop and trip indication
- Direct AF contactor mounting or separate mounting with DB42
Technical selection summary
| Complete model | TF42-38 |
|---|---|
| ABB order code | 1SAZ721201R1055 |
| Adjustable current setting range | 35-38A |
| Number of poles | 3 |
| Trip class | 10 |
| Phase-loss sensitivity | Yes |
| Terminals | Screw terminals |
| Protection | Thermal overload; external short-circuit protection required |
| Suitable contactors | AF09-AF38, according to ABB mounting compatibility |
| Auxiliary contacts | 1NC (95-96) + 1NO (97-98) |
| Reset | Manual or automatic, selectable on device |
| Functions | Test and Stop; front trip indication |
| Rated operational voltage | 690V AC main circuit, per IEC catalogue |
| Mounting | Direct contactor mounting; DB42 for separate DIN-rail mounting |
| Dimensions (W x H x D) | 45 x 88.3 x 70.5mm; see full ABB drawing |
| Degree of protection | Housing IP20; main terminals IP10 |
| Temperature compensation | -25 to +60°C |
Select the relay setting range to include the actual motor nameplate current. This relay does not interrupt short circuits; use the coordinated upstream protective device. Manual and automatic reset use the same base-device ABB order code. Remote reset is offered only in Manual reset mode; the remote stop coil uses DC and is a different ordering item.
Accessories and installation
DB42 (1SAZ701902R0001) is the separate mounting kit. DRS-F remote reset coils support AC/DC supplies; DRS-F-TF remote stop coils support DC supplies. Select the function and exact voltage range to obtain the correct accessory order code. Only one remote-function coil is selected on this page.
| Reset Mode | Manual, Automatic |
|---|---|
| Mounting Kit | Separate mounting |
| Remote Function | Reset, Stop |
Typical applications
- Motor overload protection in AF09-AF38 contactor starters
- Pump, fan and machinery motor starter control panels
ABB Motor Protection and Control complete catalogue PDF
Related products
Product reference images and drawings
Original ABB product photographs are manufacturer reference illustrations. The exact model, range and ordering code are identified above. Complete catalogue pages below retain original headings, dimensions and footnotes, and may also show other family ratings.
