Technical illustration. Representative component image; exact configuration and appearance may vary. Images are for reference only. The supplied part’s appearance may differ.
1SAZ721201R1055 — Thermal overload relay
relayPart number: 1SAZ721201R1055
The ABB TF42-38 (1SAZ721201R1055) is a three-pole thermal overload relay for motor overload and phase-failure protection. It has a 35–38 A adjustable setting range, class 10 tripping, selectable manual or automatic reset, and one normally closed trip contact and one normally open signal contact.
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Technical specifications
| Manufacturer | ABB |
|---|---|
| Part number | 1SAZ721201R1055 |
| 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 TF42-38 |
| 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 | 35–38 A |
| Rated Operational Voltage | Main circuit: 690 V AC; auxiliary circuit: 600 V AC/DC |
| Rated Operational Current (I e ) | 38 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 | 3 |
| 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 2.1 ... 2.8 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 Method | Selectable manual or automatic |
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 is the current setting range of the ABB TF42-38?
ABB 1SAZ721201R1055, also identified as TF42-38, has an adjustable current setting range of 35–38 A and a rated operational current of 38 A. Check the motor nameplate and application requirements before selection.
What protection does the TF42-38 provide?
This class 10 thermal overload relay is intended to protect motors against overload and phase failure. Confirm the overall protection arrangement for the motor circuit before selection.
Does the TF42-38 have manual and automatic reset?
Yes. The relay offers selectable manual or automatic reset, a trip indication and a stop function. It also has one normally closed trip contact and one normally open signal contact.
How is the TF42-38 mounted?
The relay is designed for direct connection to suitable block contactors; a separate single-mounting kit is available. Confirm the exact contactor and installation requirements before ordering.
Researched on:
Research information may be outdated. Confirm fitment and specifications with our team before ordering.