ABB tf42-0.74 thermal overload relay 0.55a - 0.74a

Why Choose the ABB TF42-0.74 Thermal Overload Relay?

The ABB TF42-0.74 Thermal Overload Relay with product code 1SAZ721201R1021 is a compact and reliable motor protection relay designed to provide dependable overload and phase failure protection for small three-phase motors. Part of the trusted ABB TF42 thermal overload relay series, this electromechanical protection device is engineered for direct mounting onto ABB block contactors in industrial motor starter systems.

This overload relay improves motor reliability and operational safety by disconnecting the motor circuit whenever excessive current conditions occur. The TF42-0.74 includes temperature compensation, integrated auxiliary contacts, selectable manual or automatic reset functionality and trip indication for simplified maintenance and troubleshooting.

With an adjustable current range of 0.55 to 0.74 A, compact dimensions and direct mounting capability, the ABB TF42-0.74 is ideal for protecting small industrial motors used in automation systems, conveyors, pumps, precision machinery and OEM equipment.

Key Advantages

• Reliable thermal overload protection for industrial motors.
• Adjustable current range from 0.55 to 0.74 A.
• Integrated phase failure sensitivity for enhanced motor protection.
• Compact design for direct mounting onto ABB contactors.
• Trip class 10 protection for standard motor applications.
• Selectable manual or automatic reset functionality.
• Integrated STOP function and trip indication.

Key Features

• ABB TF42 thermal overload relay series.
• 0.55 to 0.74 A adjustable overload setting.
• Trip class 10 overload protection.
• 3-pole motor protection relay.
• 1 NO + 1 NC integrated auxiliary contacts.
• Temperature-compensated operation.
• Manual or automatic reset selection.
• Trip-free mechanism with STOP function.
• Compact IP20 enclosure for control panel installation.

Technical Specifications

• Manufacturer: ABB
• Series: TF42 Thermal Overload Relays
• Model: TF42-0.74
• Product code: 1SAZ721201R1021
• Product type: Thermal overload relay
• Current adjustment range: 0.55 to 0.74 A
• Rated operational current: 0.74 A
• Trip class: Class 10
• Number of poles: 3
• Auxiliary contacts: 1 NO + 1 NC
• Rated insulation voltage: 690 V AC
• Rated operational voltage: Auxiliary circuit 600 V AC/DC
• Protection rating: IP20
• Reset method: Automatic or manual
• Mounting type: Direct attachment to contactor
• Terminal type: Screw terminals
• Dimensions (H × W × D): approx. 88.3 × 45 × 70.5 mm
• Operating temperature: approx. -25 °C to +60 °C
• Weight: approx. 0.13 kg

Reliable Motor Protection for Industrial Automation

Thermal overload relays are essential components in industrial motor control systems, protecting motors from overheating caused by excessive current draw or phase imbalance conditions. By disconnecting the motor during overload events, overload relays help extend motor lifespan and reduce costly downtime.

The ABB TF42 series is specifically designed for industrial automation and machine building applications where compact installation, reliable operation and seamless integration with ABB contactors are essential. Integrated auxiliary contacts and flexible reset functionality simplify commissioning and maintenance within modern control panels.

Typical Applications

• Industrial motor starter assemblies.
• Precision automation systems.
• Small pumps and fan systems.
• Conveyor and material handling equipment.
• Packaging and OEM machinery.
• Industrial control panels and automation cabinets.

Trusted by Industrial Engineers Worldwide

ABB thermal overload relays are trusted worldwide for delivering dependable motor protection, improving operational safety and helping reduce downtime in demanding industrial automation systems.