ABB TF42-4.2 1SAZ721201R1035 Thermal Overload Relay 3.1-4.2A

ABB TF42-4.2 (article 1SAZ721201R1035) is a thermal overload relay with a current setting range of 3.1 A to 4.2 A, built to protect motors in the main circuit against overload conditions and phase failure. It uses an electromechanical operating principle and delivers trip class 10 performance, mounting directly onto ABB block contactors for a compact motor starter assembly.

Technical specifications:

• Series: TF42-4.2
• ABB article number: 1SAZ721201R1035
• EAN: 4013614398094
• Type: Thermal overload relay
• Current setting range: 3.1 A - 4.2 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:

• Trip class 10 performance delivers fast disconnection of the motor circuit when overload or phase failure is detected
• Temperature compensation keeps tripping behavior consistent across varying ambient conditions
• Selectable automatic or manual reset gives operators direct control over circuit restoration after a trip event
• Trip-free mechanism and STOP function prevent the relay from being held in the closed position during a fault condition
• Built-in trip indication gives a clear visual signal that the relay has operated, simplifying fault diagnosis on the panel

Applications:

• Motor protection in industrial machinery, pumps, and conveyor drives
• Direct integration with ABB block contactors in motor starter assemblies
• Control panel circuit protection for small three-phase motors in manufacturing environments
• Motor circuit protection in HVAC and building services installations

Also known as: ABB TF42-4.2, TF42-4.2 1SAZ721201R1035, thermal overload relay 3.1-4.2 A, ABB motor protection relay, TF42 overload relay.