Contactors are designed to handle high-current loads, while relays are suitable for low to medium-current loads. This difference in load capacity results from the design and construction of the devices, with contactors featuring larger and more robust auxiliary contacts to accommodate higher currents.

Relays are generally used for lower-power applications and can switch multiple contacts simultaneously. They are suitable for controlling small electrical loads. Conversely, contactors are designed to control high-power circuits and are typically used in industrial applications.

Contactors to control motors up to 800 A (40 kW / 400V) or switch lines up to 1100A. TeSys Giga is the range of high current contactors from 115 A to 800 A for AC-3 (motor) applications and from 250 A to 1050 A for AC-1 (resistive) applications.

the current value of the contactor's closing capacity is determined as 10xIe and the breaking capacity as 8xIe. After these current values, adhesion can be observed in the contacts. Reason for coil burns: Coil may burn when the voltage applied to the contactor coil ends is lower or higher than normal.