Description
The ABB TF42-1.7 is a thermal overload relay engineered for reliable motor protection in demanding HVAC and industrial electrical applications. Designed to work seamlessly with ABB contactors, this relay provides precise overcurrent protection with a current adjustment range of 1.3 to 1.7 Amps and a Class 10 trip characteristic, making it well-suited for standard motor starting applications where fast protection response is required.
Key Features
- Current adjustment range: 1.3–1.7 Amps
- Class 10 trip characteristic for standard motor protection
- Screw terminal connections for secure, reliable wiring
- Selectable Manual or Auto Reset — choose the reset mode that fits your application
- Integrated Test and Stop function for commissioning and maintenance convenience
- Built-in temperature compensation ensures consistent tripping performance across varying ambient conditions
Manual/Auto Reset Flexibility
The selectable Manual/Auto Reset feature gives technicians full control over how the relay responds after a trip event. Manual reset requires a deliberate operator action before the motor restarts, adding a layer of safety. Auto reset allows the relay to self-recover once the overload condition clears, ideal for remote or unattended installations.
Test and Stop Function
The built-in Test and Stop function allows installers and service technicians to verify relay operation without creating an actual overload condition. This simplifies commissioning, routine maintenance checks, and troubleshooting, reducing downtime on the job.
Temperature Compensation
Temperature compensation ensures the relay trips consistently regardless of the surrounding ambient temperature. This is critical in HVAC mechanical rooms and equipment enclosures where temperatures can fluctuate significantly, helping to prevent nuisance trips or under-protection in hot environments.
Specifications
- Brand: ABB
- SKU / Part Number: TF42-1.7
- Current Range: 1.3–1.7 Amps
- Trip Class: Class 10
- Terminal Type: Screw Terminals
- Reset Type: Selectable Manual / Auto Reset
- Additional Functions: Test and Stop, Temperature Compensation
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