ABB TF42-24 Thermal Overload Relay, 18-24 A, 690 V AC, 3-Pole, Class 10

Thermal overload relay providing dependable protection for motors against overload and phase failure, with a setting range of 18.0 to 24.0 A. This 3-pole device ensures reliable operation in industrial environments, featuring manual and automatic reset options and screw terminals for secure connections.

Advantages

The TF42-24 offers precise thermal protection with phase failure sensitivity, ensuring motors are safeguarded against overheating and current imbalances. Its Class 10 tripping characteristic provides fast response to overloads, reducing downtime and preventing damage. The relay supports both manual and automatic reset, allowing flexibility in control schemes. With a rated operational voltage of 690 V AC and insulation voltage of 690 V AC, it is suitable for a wide range of applications. The compact design enables direct mounting to ABB contactors or standalone installation, saving panel space.

Suitable for

• Motor protection in industrial control panels
• Pumps, fans, conveyors, and compressors
• Applications requiring compliance with IEC/EN 60947, UL 60947, and CSA 22.2 No. 60947
• Use with ABB AF09-AF38, A9-A40, and AX09-AX40 contactors

Key specifications

• Setting range: 18.0 - 24.0 A
• Rated operational voltage: 690 V AC
• Rated insulation voltage: 690 V AC
• Rated impulse withstand voltage: 6 kV
• Number of poles: 3
• Tripping class: Class 10
• Auxiliary contacts: 1 NO + 1 NC
• Reset type: Manual and automatic
• Ambient operating temperature: -25 to +60 °C
• Degree of protection: IP20
• Connection type: Screw terminals
• Power loss: 4.5 W
• Mounting: Direct to contactor or standalone
• Phase failure sensitivity: Yes
• Standards: IEC/EN 60947, UL 60947, CSA 22.2 No. 60947
• Rated frequency: 50/60 Hz

Recommendations

For optimal motor protection, pair the TF42-24 with a compatible ABB contactor from the AF, A, or AX series. Ensure proper sizing by selecting a relay whose setting range covers the motor's full load current. Install in an enclosure with adequate ventilation to maintain ambient temperature within -25 to +60 °C. Regularly inspect connections and test the overload trip function during maintenance.