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ABB tf42-0.74 thermal overload relay 0.55a – 0.74a
ABB TF42-0.74 thermal overload relay with adjustable current range from 0.55 to 0.74 A, designed for industrial motor protection and automation systems.
£39.08
Why Choose the ABB TF42-0.74 Thermal Overload Relay?
The ABB TF42-0.74 Thermal Overload Relay (1SAZ721201R1021) is a dependable electromechanical motor protection device designed to protect three-phase motors against overload conditions and phase failure. As part of the trusted ABB TF42 thermal overload relay series, it delivers reliable overload protection while helping minimise downtime, improve equipment reliability and extend motor service life.
Designed for direct mounting onto compatible ABB AF09 to AF38 contactors, the TF42-0.74 combines straightforward installation with dependable performance. It incorporates temperature compensation, selectable automatic or manual reset, integrated auxiliary contacts, trip indication, a trip-free mechanism and STOP/TEST functions, making it ideal for industrial motor starter applications.
With an adjustable current range of 0.55 to 0.74 A and Trip Class 10 protection, the ABB 1SAZ721201R1021 is ideally suited to protecting small three-phase motors used in conveyors, pumps, fans, machine tools, packaging machinery and industrial automation systems.
Key Advantages
- Reliable thermal overload protection for three-phase motors.
- Adjustable overload setting from 0.55 to 0.74 A.
- Protects against motor overload and phase failure.
- Trip Class 10 provides rapid overload protection.
- Automatic or manual reset selectable.
- Direct mounting onto ABB AF09 to AF38 contactors.
Key Features
- ABB TF42 thermal overload relay series.
- Current adjustment range: 0.55 to 0.74 A.
- Trip Class 10 overload protection.
- Integrated temperature compensation.
- Phase failure sensitivity.
- 1 NO + 1 NC auxiliary contacts.
- Trip-free mechanism with STOP and TEST functions.
- Automatic or manual reset selection.
- Direct mounting onto ABB AF09, AF12, AF16, AF26, AF30 and AF38 contactors.
Reliable Motor Protection for Industrial Applications
Thermal overload relays continuously monitor motor current and disconnect the control circuit whenever prolonged overload or phase failure is detected. This protects motors against overheating, insulation damage and premature failure while improving equipment reliability and reducing maintenance costs.
The ABB TF42 series is widely used in industrial motor starters and electrical control panels where dependable overload protection and seamless compatibility with ABB AF contactors are essential. Its compact design makes it suitable for OEM machinery, manufacturing plants and industrial automation systems.
Typical Applications
- Industrial motor starters.
- Electrical control panels.
- Conveyors and material handling systems.
- Small pumps and fans.
- Machine tools.
- Packaging machinery.
- OEM automation equipment.
- Industrial process machinery.
Technical Specifications
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| Compatible With | AF09–AF38 | |
|---|---|---|
| Mounting Type | Direct mount on contactor | |
| Device Type | Thermal Overload Relay | |
| Current Range | 0.55–0.74 A | |
| Trip Class | Class 10 | |
| Reset Type | Manual / Automatic | |
| Current | 0.74 A | |
| Phase | Three Phase | |
| IP Rating | IP20 | |
| Poles | 3-pole | |
| Series | TF42 Thermal Overload Relays | |
| Product code | 1SAZ721201R1021 | |
| Product type | Thermal overload relay | |
| Current adjustment range | 0.55 to 0.74 A | |
| Rated operational current | 0.74 A | |
| Trip class | Class 10 | |
| Number of poles | 3 | |
| Auxiliary contacts | 1 NO + 1 NC | |
| Rated insulation voltage | 690 V AC | |
| Rated operational voltage | Auxiliary circuit 600 V AC/DC | |
| Protection rating | IP20 | |
| Reset method | Automatic or manual | |
| Mounting type | Direct attachment to contactor | |
| Terminal type | Screw terminals | |
| Dimensions (H × W × D) | approx. 88.3 × 45 × 70.5 mm | |
| Operating temperature | approx. -25 °C to +60 °C | |
| Weight | approx. 0.13 kg |
Frequently Asked Questions
What is the ABB TF42-0.74 used for?
It protects small three-phase motors against overload conditions and phase failure, helping prevent motor damage and unexpected downtime.
What current range does the TF42-0.74 support?
The relay has an adjustable overload setting range of 0.55 to 0.74 A.
Does this relay include auxiliary contacts?
Yes. It includes 1 normally open (NO) and 1 normally closed (NC) auxiliary contact.
Can the relay be reset manually?
Yes. The reset mode can be selected for either automatic or manual operation depending on the application.
Which contactors is the TF42-0.74 compatible with?
It is designed for direct mounting onto compatible ABB AF09, AF12, AF16, AF26, AF30 and AF38 contactors.
Trusted by Industrial Professionals Worldwide
ABB TF42 thermal overload relays are trusted by machine builders, panel manufacturers and maintenance engineers worldwide for dependable motor protection, long service life and seamless integration into industrial control systems.
