ABB TF42-20 1SAZ721201R1049 Thermal Overload Relay 16-20A

The ABB TF42-20 (article 1SAZ721201R1049) is a thermal overload relay with a current setting range of 16 to 20 A. It is an electromechanical protection device for the main circuit, designed to guard motors against overload conditions and phase failure. The relay mounts directly onto block contactors, simplifying integration into motor starter configurations.

Technical specifications:

• Series: TF42-20
• ABB article number: 1SAZ721201R1049
• EAN: 4016779764971
• Product type: Thermal overload relay
• Current setting range: 16 to 20 A
• Trip class: 10
• Trip contact: NC (normally closed)
• Signal contact: NO (normally open)
• Reset mode: Automatic or manual, selectable
• Mounting: Direct connection to block contactors; single mounting kits available as accessory

Features and benefits:

• Trip class 10 rating for defined motor overload protection response
• Phase failure detection protects motors from the damage caused by single-phase operation
• Temperature compensation maintains consistent tripping behavior across varying ambient conditions
• Selectable automatic or manual reset lets the installer match relay behavior to the application
• Trip-free mechanism with STOP function and trip indication prevents the relay from being held in during a fault and provides clear fault status

Applications:

• Motor overload protection in the 16 to 20 A range for industrial machinery
• Direct-on-line and reversing motor starter assemblies built with block contactors
• Pump, fan, and compressor motor circuits requiring automatic or manual reset capability
• Conveyor and machine tool motor control panels needing overload and phase failure monitoring

Also known as: ABB TF42-20, TF42-20 1SAZ721201R1049, thermal overload relay 16-20 A, ABB motor protection relay, TF42-20 overload relay.