ABB TF42-1.3 Thermal Overload Relay, 0.9-1.3 A, 3-Pole, Class 10, 1NO+1NC, Screw Terminals 1SAZ721201R1025

In motor control panels across industrial facilities, the ABB TF42-1.3 thermal overload relay protects three-phase motors from overheating due to overloads or phase loss. Its adjustable current setting from 0.9 to 1.3 A makes it suitable for small motors, while the Class 10 tripping characteristic ensures rapid response to overload conditions. The relay mounts directly onto ABB AF09...AF38 contactors or as a standalone unit with an accessory, simplifying installation and wiring.

Key specifications

• Current setting range: 0.9 - 1.3 A
• Number of poles: 3
• Tripping class: Class 10
• Auxiliary contacts: 1 NO + 1 NC
• Rated operational voltage: 690 V AC
• Rated insulation voltage: 690 V AC
• Rated impulse withstand voltage: 6 kV
• Reset: manual and automatic
• Mounting: direct to contactor or standalone with accessory
• Connection: screw terminals
• Phase loss sensitivity: yes
• Degree of protection: IP20
• Ambient operating temperature: -25 to +60 °C
• Standards: IEC/EN 60947-1, IEC/EN 60947-4-1, UL 60947-4-1, CSA 22.2 No. 60947-4-1
• Power loss: 2.2 W at rated operational current

Why choose it

The TF42-1.3 offers reliable motor protection in a compact design. Its phase loss sensitivity prevents motor damage from single-phasing, and the manual/automatic reset options provide flexibility for different applications. Direct mounting onto ABB contactors reduces wiring time and ensures a secure connection. Compliance with international standards guarantees performance and safety.

Ideal use cases

• Protection of small three-phase motors in industrial machinery
• Pumps, fans, and conveyors requiring Class 10 overload protection
• Retrofit and new installations using ABB AF series contactors
• Applications with frequent starts and stops where quick tripping is essential

Good to know

The relay's screw terminals accept a range of conductor sizes, and its IP20 protection is suitable for installation inside control cabinets. For standalone mounting, use the appropriate adapter (sold separately). The TF42-1.3 is part of ABB's comprehensive motor protection range, ensuring compatibility and availability of spare parts.