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1SAZ721201R1051 — Thermal overload relay
relayPart number: 1SAZ721201R1051
ABB TF42-24 (1SAZ721201R1051) is an electromechanical thermal overload relay for motor overload and phase-failure protection. It has a 20–24 A adjustable current range, trip class 10, selectable manual or automatic reset, and normally closed trip and normally open signal contacts. It connects directly to block contactors; a single-mounting kit is available as an accessory.
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Technical specifications
| Manufacturer | ABB |
|---|---|
| Part number | 1SAZ721201R1051 |
| 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 TF42-24 |
| 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 | 20–24 A |
| Rated Operational Voltage | Main circuit: 690 V AC; auxiliary circuit: 600 V AC/DC |
| Rated Operational Current (I e ) | 24 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 | 10 |
| Reset | Selectable automatic or manual |
| Auxiliary Contacts | 1 normally closed trip contact and 1 normally open signal contact |
| Ambient Air Temperature | Operation and compensated operation: −25 to +60 °C; storage: −50 to +80 °C |
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 TF42-24 have?
ABB 1SAZ721201R1051 is the TF42-24 thermal overload relay. Its adjustable current setting range is 20–24 A and its trip class is 10. Check the motor and starter requirements before selecting the relay.
What does this overload relay protect against?
The TF42-24 provides motor overload and phase-failure protection. It is an electromechanical relay for the main circuit; confirm the complete protection arrangement for the installation.
Can the TF42-24 be mounted on a contactor?
The relay connects directly to block contactors, and a single-mounting kit is available as an accessory. The listed contactor range is ABB AF09 to AF38; confirm the exact contactor designation and equipment serial number, if applicable, before ordering.
Does the TF42-24 offer automatic reset and auxiliary contacts?
Yes. Automatic or manual reset is selectable. The relay has a normally closed trip contact, a normally open signal contact, a STOP function and trip indication.
Researched on:
Research information may be outdated. Confirm fitment and specifications with our team before ordering.