ABB TF42-38 (order code 1SAZ721201R1055) is a genuine ABB thermal overload relay: Thermal Overload Relay 35-38 A, Class 10, 1NO+1NC.
Thermal overload relays are standard parts of every direct-on-line and star-delta starter; a relay that trips repeatedly or no longer resets is replaced with the same type and current range.
More ABB contactors, overload relays and control parts: ABB range.
Technical data
| ABB type | TF42-38 |
|---|---|
| ABB order code | 1SAZ721201R1055 |
| Product Name | Thermal Overload Relay |
| Rated Operational Current AC-3 | 38 A |
| Number of Auxiliary Contacts NO | 1 |
| Number of Auxiliary Contacts NC | 1 |
| Setting Range | 35 … 38 A |
| Rated Operational Current | 38 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 2.5 … 2.7 N·m |
| Mounting Position | Position 1 to 5 |
| Power Loss | at Rated Operating Conditions per Pole 2.1 … 2.8 W |
Key data (per ABB)
- Setting Range: 35 … 38 A
- Trip Class: class 10
- Suitable For: AF09 AF12 AF16 AF26 AF30 AF38
- Rated Operational Current AC-3: 38 A
- Ambient Air Temperature Compensation: Yes
Typical applications
- Conveyors and machine motors
- Pumps, fans and compressors
- Star-delta starters
- Replacement of a failed overload relay
- Direct-on-line motor starters with AF contactors
Compatibility and replacement
Order with the full type TF42-38 or the order code 1SAZ721201R1055; 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.
All values in the table are from ABB’s official product data; if your old unit differs, send a photo of its label and we will check it.
Replacement checklist
- Contactor size it mounts on
- Reset mode (manual/automatic)
- Setting range versus the motor full-load current
Frequently asked questions
What trip class does it have?
Class 10, according to ABB’s product data.
Which standards does it meet?
IEC/EN 60947-1 IEC/EN 60947-4-1 IEC/EN 60947-5-1 UL 60947-1 UL 60947-4-1, according to ABB’s product data.
What is the setting range?
35 … 38 A, 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.
Ordering tips
Send us the full order number from the label of the old part, or a clear photo of the label, together with the quantity you need. We check the number against the current manufacturer data before we quote and tell you if there is a newer replacement.
Need it fast? Send the order number, quantity and delivery country on WhatsApp or through the inquiry form and we reply with a quotation the same working day. All parts are new and original, covered by a 1-year warranty, and ship worldwide by air in 5 to 7 days once ready (shipping, payment and warranty). Local agents: Saudi Arabia, Iraq, the UAE, Egypt, Oman, Libya, Morocco, Mauritania, Yemen, Algeria and Jordan.
