ABB TF42-5.7 Thermal Overload Relay 4.2-5.7 A, Class 10, 3-Pole, 1NO+1NC, Screw Terminals 1SAZ721201R1038

The ABB TF42-5.7 thermal overload relay stands out with its precise current setting range of 4.2 to 5.7 A, ensuring reliable motor protection in a compact, direct-mounting design. Unlike generic alternatives, this relay features phase-loss sensitivity and both manual and automatic reset, making it a robust choice for demanding industrial environments.

Highlights

• Adjustable thermal overload protection for motors with rated currents from 4.2 A to 5.7 A
• Class 10 tripping characteristic for standard motor start-ups
• Phase-loss sensitivity prevents motor damage from single-phasing
• Manual and automatic reset modes for flexible operation
• Auxiliary contacts: 1 NO + 1 NC for control and signaling
• Direct mounting on ABB A9-A40 and AF09-AF40 contactors; separate mounting possible with adapter

In daily use

Designed for continuous duty, the TF42-5.7 operates reliably in ambient temperatures from -25 °C to +60 °C. Its screw terminals simplify wiring, and the IP20 protection degree suits installation in enclosed control panels. The relay's low power loss of 3.6 W contributes to energy-efficient operation. With a rated insulation voltage of 690 V AC and impulse withstand of 6 kV, it meets stringent safety standards including IEC/EN 60947-1, 60947-4-1, and 60947-5-1.

Full specifications

• Rated operational current range: 4.2 - 5.7 A
• Trip class: Class 10
• Number of poles: 3
• Rated insulation voltage (Ui): 690 V AC
• Rated impulse withstand voltage (Uimp): 6 kV
• Rated operational voltage (Ue): 690 V AC
• Auxiliary contacts: 1 NO + 1 NC
• Mounting: Direct to contactor / separate with adapter
• Main circuit connection: Screw terminals
• Auxiliary circuit connection: Screw terminals
• Ambient operating temperature: -25 to +60 °C
• Ambient storage temperature: -40 to +70 °C
• Degree of protection: IP20
• Standards: IEC/EN 60947-1, 60947-4-1, 60947-5-1
• Power loss: 3.6 W at Ie
• Reset type: Manual and automatic
• Phase loss sensitivity: Yes
• Suitable for contactors: ABB A9-A40, AF09-AF40

Final note

For reliable motor protection in a compact form, the ABB TF42-5.7 thermal overload relay delivers precision and durability, backed by ABB's engineering excellence.