Technical illustration. Representative component image; exact configuration and appearance may vary. Images are for reference only. The supplied part’s appearance may differ.
1SAZ721201R1052 — Thermal overload relay
relayPart number: 1SAZ721201R1052
ABB TF42-29 (1SAZ721201R1052) is a three-pole thermal overload relay with a 24–29 A adjustable current setting and class 10 trip characteristic. It provides motor overload and phase-loss protection and features selectable manual or automatic reset, temperature compensation, trip indication, and one normally closed trip contact and one normally open signal contact.
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Technical specifications
| Manufacturer | ABB |
|---|---|
| Part number | 1SAZ721201R1052 |
| Category | Electrical & controls |
| Ex Operating Instructions | ATEX - Operating instructions for thermal overload relay TF42 for potentially explosive areas |
| Time-Current Characteristic Curve | Tripping characteristic - Thermal overload relay TF42-29 |
| Product Net Width | 45 mm |
| Product Net Height | 88.3 mm |
| Product Net Depth / Length | 70.5 mm |
| Product Net Weight | 0.145 kg |
| Setting Range | 24–29 A |
| Rated Operational Voltage | Main circuit: 690 V AC; auxiliary circuit: 600 V AC/DC |
| Rated Operational Current (I e ) | 29 A |
| Rated Frequency (f) | Auxiliary Circuit 50 Hz |
| Rated Impulse Withstand Voltage (U imp ) | Auxiliary Circuit 6 kV |
| Rated Insulation Voltage (U i ) | 690 V |
| Number of Poles | 3P |
| Number of Auxiliary Contacts NC | 1 |
| Number of Auxiliary Contacts NO | 1 |
| Number of Protected Poles | 3 |
| Conventional Free-air Thermal Current (I th ) | Auxiliary Circuit NC 6 A |
| Rated Operational Current AC-15 (I e ) | (120 V) NC 3 A |
| Rated Operational Current DC-13 (I e ) | (125 V) NC 0.55 A |
| Degree of Protection | IP20 |
| Connecting Capacity Auxiliary Circuit | Flexible with Ferrule 1/2x 0.75 ... 2.5 mm² |
| Connecting Capacity Main Circuit | Flexible with Ferrule 1/2x 2.5 ... 10 mm² |
| Tightening Torque | Auxiliary Circuit 1 ... 1.2 N·m |
| Wire Stripping Length | Auxiliary Circuit 9 mm |
| Power Loss | at Rated Operating Conditions per Pole 1.8 ... 2.6 W |
| Maximum Operating Voltage UL/CSA | Main Circuit 600 V AC |
| Contact Rating UL/CSA | (NC:) B600 |
| Connecting Capacity Main Circuit UL/CSA | Flexible 1/2x 14-6 AWG |
| Published component type | Thermal overload relay |
| Reference status | Published part reference; specification and fitment require confirmation |
| Availability | On request |
| Trip Class | Class 10 |
| Reset Mode | Selectable manual or automatic |
| Ambient Operating Temperature | −25 to +60 °C |
| Terminal Type | Screw terminals |
Catalogue information may contain errors or be out of date. Full specifications and verified details are available on request. Confirm the part number and equipment fitment with us before ordering.
Product questions
What current range and trip class does the ABB TF42-29 offer?
The TF42-29, part 1SAZ721201R1052, has an adjustable setting range of 24–29 A and trip class 10. Check the motor nameplate current and the application requirements before selecting it.
Does the TF42-29 protect against phase loss and short circuits?
It provides motor overload protection and is sensitive to phase loss. A separate short-circuit protective device is required; its selection depends on the complete installation and applicable coordination requirements.
Can the TF42-29 be reset manually or automatically?
Yes. Manual or automatic reset is selectable. The relay also has a trip indication and STOP and TEST functions.
Which contactors can the TF42-29 be mounted on?
ABB lists direct mounting on AF09 through AF38 contactors. Confirm the exact contactor and starter configuration before ordering; provide the equipment model and serial number if the application is uncertain.
What auxiliary contacts does the TF42-29 have?
It has one normally closed trip contact and one normally open signal contact. The ABB data sheet identifies them as 95–96 and 97–98 respectively.
Researched on:
Research information may be outdated. Confirm fitment and specifications with our team before ordering.