ABB – 1SAZ721201R1035 – TF42‑4.2 Thermal Overload Relay, 3.1–4.2 A, 3‑Pole

The ABB TF42‑4.2 (1SAZ721201R1035) is a 3‑pole thermal overload relay offering reliable motor protection with adjustable trip current, phase‑loss sensitivity, and automatic or manual reset. It features a trip‑free mechanism, IEC trip class 10 rating, and both signal (NO) and trip (NC) auxiliary contacts, suitable for use with AF‑series contactors in industrial control panels.

Key Features:

• Part / Model: 1SAZ721201R1035 (TF42‑4.2)  

• Current Setting: 3.1–4.2 A, adjustable via front dial  

• Poles: 3‑Phase protection with NO + NC auxiliary contacts  

• Trip Class: Class 10, includes temperature compensation & phase‑loss detection  

• Reset Modes: Front dial allows automatic, manual, or STOP/test function  

• Mounting: Directly attaches to AF09–AF38 contactor series, 45 mm width, IP20  

• Certifications: IEC/EN 60947‑4‑1, 6 kV impulse withstand, ATEX, UL/cUL  

• Temperature Range: −25 °C to +60 °C; power loss ~2 W/pole