ABB TF42-0.55 Relé térmico de sobrecarga, 0,45-0,55 A, 690 V AC, 3 polos, 1NO+1NC

With a rated impulse withstand voltage of 6 kV, the ABB TF42-0.55 thermal overload relay delivers robust protection for motors up to 690 V AC. This compact device offers precise current adjustment from 0.45 to 0.55 A, ensuring reliable operation in demanding industrial environments.

Overview

The ABB TF42-0.55 is a thermal overload relay engineered for direct mounting on ABB AF09-AF38 contactors or standalone installation. It provides dependable protection against overloads and phase failures, with manual and automatic reset options to suit various applications. The relay features a temperature-compensated design that maintains accuracy from -20 to +60 °C, making it suitable for a wide range of operating conditions.

What stands out

• Rated operational voltage up to 690 V AC for versatile use.
• Adjustable current range from 0.45 to 0.55 A for precise motor protection.
• Phase failure sensitivity prevents motor damage from unbalanced loads.
• Manual and automatic reset modes offer flexibility in control schemes.
• Compatible with ABB AF09-AF38 contactors for seamless integration.
• IP20 protection and DIN rail mounting for easy installation.

Technical details

• Rated operational current setting range: 0.45 - 0.55 A
• Rated operational voltage: 690 V AC
• Rated insulation voltage (Ui): 690 V
• Rated impulse withstand voltage (Uimp): 6 kV
• Number of poles: 3
• Auxiliary contact configuration: 1 NO + 1 NC
• Tripping class: Class 10A
• Temperature compensation: -20 to +60 °C
• Reset type: Manual and automatic
• Mounting type: Direct to contactor / stand-alone
• Degree of protection: IP20
• Ambient operating temperature: -25 to +60 °C
• Overload type: Thermal
• Phase failure sensitivity: Yes
• Standard compliance: IEC/EN 60947-4-1, IEC/EN 60947-5-1
• Power loss per pole: 2.5 W (at max current)

Our verdict

The ABB TF42-0.55 is a reliable and precise thermal overload relay, ideal for protecting small motors in industrial applications. Its robust construction and compliance with international standards ensure long-term performance and safety.