ABB TF42-5.7 (order code 1SAZ721201R1038) is a genuine ABB thermal overload relay: Thermal Overload Relay 4.2-5.7 A, Class 10, 1NO+1NC.
TF thermal overload relays protect motors against overload and phase failure: bimetal strips heated by the motor current trip the auxiliary contact, which opens the contactor coil circuit. They mount directly under AF contactors.
More ABB contactors, overload relays and control parts: ABB range.
Technical data
| ABB type | TF42-5.7 |
|---|---|
| ABB order code | 1SAZ721201R1038 |
| Product Name | Thermal Overload Relay |
| Rated Operational Current AC-3 | 5.7 A |
| Number of Auxiliary Contacts NO | 1 |
| Number of Auxiliary Contacts NC | 1 |
| Setting Range | 4.2 … 5.7 A |
| Rated Operational Current | 5.7 A |
| Trip Class | class 10 |
| Rated Operational Voltage | Auxiliary Circuit 600 V AC / DC Main Circuit 690 V AC |
| Rated Insulation Voltage | 690 V |
| Rated Impulse Withstand Voltage | Auxiliary Circuit 6 kV Main Circuit 6 kV |
| Number of Poles | 3 |
| Number of Protected Poles | 3 |
| Suitable For | AF09 AF12 AF16 AF26 AF30 AF38 |
| Conventional Free-air Thermal Current | Auxiliary Circuit NC 6 A Auxiliary Circuit NO 4 A |
| Rated Frequency | Auxiliary Circuit 50 Hz Auxiliary Circuit 60 Hz Auxiliary Circuit DC Main Circuit 50Hz Main Circuit 60 Hz |
| Degree of Protection | IP20 |
| Wire Stripping Length | Auxiliary Circuit 9 mm Main Circuit 12 mm |
| Tightening Torque | Auxiliary Circuit 1 … 1.5 N·m Main Circuit 1.5 … 2.5 N·m |
| Mounting Position | Position 1 to 5 |
| Power Loss | at Rated Operating Conditions per Pole 1.1 … 2.0 W |
Key data (per ABB)
- Setting Range: 4.2 … 5.7 A
- Trip Class: class 10
- Suitable For: AF09 AF12 AF16 AF26 AF30 AF38
- Rated Operational Current AC-3: 5.7 A
- Ambient Air Temperature Compensation: Yes
Typical applications
- Replacement of a failed overload relay
- Conveyors and machine motors
- Pumps, fans and compressors
- Star-delta starters
- Direct-on-line motor starters with AF contactors
Compatibility and replacement
Order with the full type TF42-5.7 or the order code 1SAZ721201R1038; in ABB type designations the last digits select the current range or the coil voltage, so a part with a different suffix is not always a drop-in replacement.
If the old label is worn, send us a photo and we will confirm the matching ABB type before quoting.
What to check first
- Reset mode (manual/automatic)
- Trip class
- Contactor size it mounts on
Frequently asked questions
What is the AC-3 rating?
5.7 A, according to ABB’s product data.
Which contactors does it fit?
AF09 AF12 AF16 AF26 AF30 AF38, according to ABB’s product data.
What ambient temperature is allowed?
Operation -25 … +60 °C Operation Compensated -25 … +60 °C Storage -50 … +80 °C, according to ABB’s product data.
Is it new and original?
Yes. We supply new, original parts in the manufacturer packaging, with a 1-year warranty.
Do you ship to my country, and what is the warranty?
Yes. RendatSP ships worldwide from Yiwu, China, by air in 5 to 7 days once the part is ready, and every part carries a 1-year warranty. Send the order number and quantity on WhatsApp and we will reply with a quotation.
Before you order
Compare the complete order number on the old unit with this page, including the suffix: in most ranges the last characters set the coil voltage, current range or version. If the label is worn, send us a photo and we will identify the part.
RendatSP ships from Yiwu, China, to factories worldwide; air delivery usually takes 5 to 7 days once the part is ready. The part is new and original with a 1-year warranty (shipping, payment and warranty). For a quotation, message us on WhatsApp with the order number and quantity. We also have agents in Saudi Arabia, Iraq, the UAE, Egypt, Oman, Libya, Morocco, Mauritania, Yemen, Algeria and Jordan.
