The WTSA320‑4N2 A is a 320A thermal overload relay from the TeSys A series, designed for heavy‑duty motor protection in industrial applications. It provides adjustable overload, phase‑unbalance, and phase‑loss protection, with manual/auto reset options and a mechanical trip indicator.
Specifications
Parameter Specification
Model WTSA320‑4N2 A
Current Setting Range 200 – 320 A
Rated Insulation Voltage (Ui) 690 V AC
Rated Operational Voltage (Ue) 400 V AC
Poles 3 poles
Trip Class Class 10
Ambient Temperature Range –25 °C to +60 °C
Mounting DIN‑rail or direct mounting
Auxiliary Contacts 1 NO (97‑98) + 1 NC (95‑96)
Trip Indication Mechanical flag (red)
Reset Manual / automatic (selectable)
Standards IEC/EN 60947‑4‑1, UL 508
Compatibility TeSys A/LV1 contactors
Primary Applications
Heavy‑duty motor protection (pumps, compressors, large fans)
Conveyor and material‑handling systems
Industrial machinery and process equipment
HVAC and large building automation systems