ABB TF42-24 1SAZ721201R1051 Thermal Overload Relay 20-24A

The ABB TF42-24 (article 1SAZ721201R1051) is a thermal overload relay with a current setting range of 20 - 24 A, built for main circuit protection in motor applications. As an electromechanical device, it safeguards motors against overload conditions and phase failure, operating at trip class 10. It mounts directly to block contactors and is complemented by optional single mounting kits for standalone installation.

Technical specifications:

• Series: TF42-24
• ABB article number: 1SAZ721201R1051
• EAN: 4013614398155
• Type: Thermal Overload Relay
• Current setting range: 20 - 24 A
• Trip class: 10
• Trip contact: NC
• Signal contact: NO
• Reset mode: Automatic or manual (selectable)
• Mounting: Direct connection to block contactors; single mounting kits available as accessory

Features and benefits:

• Phase failure detection halts the motor when one phase is lost, preventing winding damage
• Temperature compensation adjusts the trip threshold to match ambient conditions, avoiding unnecessary shutdowns
• Trip-free mechanism ensures the relay always trips on a genuine fault, even when the reset button is held
• Selectable automatic or manual reset lets the installer choose the appropriate restart behavior for each application
• Integrated STOP function and trip indication simplify fault diagnosis and reduce additional wiring in the panel

Applications:

• Motor starter circuits in industrial control cabinets
• Overload protection for pumps, fans, and compressors
• Conveyor and machine drive panels using block contactor assemblies
• HVAC and water treatment systems requiring dependable motor protection

Also known as: ABB TF42-24, TF42-24 1SAZ721201R1051, thermal overload relay 20-24A, motor protection relay 1SAZ721201R1051, ABB overload relay TF42.