ABB TF42-5.7 1SAZ721201R1038 Thermal Overload Relay 4.2-5.7A

The ABB TF42-5.7 (article 1SAZ721201R1038) is a thermal overload relay with a current setting range of 4.2 to 5.7 A and trip class 10. It serves as an electromechanical protection device in the main circuit, shielding motors from damage caused by overload or phase failure. The relay connects directly to block contactors, and single mounting kits are available as an accessory for standalone installation.

Technical specifications:

• Series: TF42-5.7
• ABB article number: 1SAZ721201R1038
• EAN: 4013614398100
• Current setting range: 4.2 - 5.7 A
• Trip class: 10
• Trip contact: NC
• Signal contact: NO
• Reset mode: Automatic or manual (selectable)
• Mounting: Direct connection to block contactors
• Accessory: Single mounting kits available

Features and benefits:

• Trip class 10 delivers fast motor protection under sustained overload conditions
• Phase failure detection halts the motor before damage occurs when a supply phase is lost
• Temperature compensation maintains consistent tripping behaviour across varying ambient temperatures
• Selectable automatic or manual reset allows the relay to match the restart requirements of the application
• Trip-free mechanism and STOP function ensure the protective trip cannot be overridden

Applications:

• Protection of three-phase motors in industrial control panels and machinery
• Motor starter assemblies built around block contactors
• Pump, fan, and conveyor motor protection in light industrial installations
• Direct-on-line starter circuits requiring overload and phase loss protection

Also known as: ABB TF42-5.7, TF42-5.7 1SAZ721201R1038, thermal overload relay 4.2-5.7 A, motor overload relay trip class 10, ABB 1SAZ721201R1038.